OCR GCSE 9-1 Twenty First Century Combined Science Suite BChemistry QUIZ on Chapter C1 "AIR and WATER" (Higher Tier)

Which of the following statements best describes the arrangement of particles in a gas? [sm-1]
1. Close together and stationary
2. Close together and vibrating
3. Far apart and moving slowly
4. Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a solid? [sm-2]
1. Close together and stationary
2. Close together and vibrating
3. Far apart and moving slowly
4. Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a liquid? [sm-3]
1. Close together and stationary
2. Far apart and vibrating
3. Close together and moving freely
4. Very far apart and moving quickly
Which of the following best describes what happens to the particles of water when it freezes? [sm-4]
1. They gain energy and break up into atoms of hydrogen and oxygen,
2. They gain energy and gain freedom to move about
3. They lose energy and escape into the atmosphere
4. They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of ice when it melts? [sm-5]
1. They gain energy and break up into atoms of hydrogen and oxygen,
2. They gain energy and gain freedom to move about
3. They lose energy and escape into the atmosphere
4. They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it boils? [sm-6]
1. They gain kinetic energy and increase their freedom to move without significant attraction
2. They gain energy and gain freedom to move about
3. They lose energy and escape into the atmosphere
4. They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water vapour when it condenses? [sm-7]
1. They gain kinetic energy and increase their freedom to move without significant attraction
2. They gain energy and gain freedom to move about
3. They lose energy and are closer and less free to move around
4. They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it evaporates? [sm-8]
1. The higher kinetic energy particles increase their freedom to move without significant attraction
2. They gain energy and gain freedom to move about
3. They lose energy and escape into the atmosphere
4. They lose energy and lose freedom to move about,
The table shows the melting points and boiling points of some substances. Which substance is a solid at 25^oC? [sm-9]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -39 and 354
2. 119 and 446
3. 15 and 126
4. -127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 0^oC? [sm-10]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -39 and 354
2. 119 and 446
3. 15 and 126
4. -127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a gas at 0^oC? [sm-11]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -39 and 354
2. 119 and 446
3. 15 and 126
4. -127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 30^oC? [sm-12]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -39 and 10
2. 119 and 446
3. 15 and 126
4. -127 and -33
Air is confined in a glass bottle with a tight screw-top. When the bottle becomes warmer when heated with a hair-dryer, the pressure inside increases because the molecules of air? [sm-13]
1. become bigger
2. become smaller
3. move faster
4. move slower
Air is in a glass bottle with a tight screw-top. When the bottle becomes cooler when placed in a refrigerator, the pressure inside decreases because the molecules of air? [sm-14]
1. become bigger
2. become smaller
3. move faster
4. move slower
When the air in a room becomes warmer a hanging balloon blown up with air becomes bigger because the molecules of air? [sm-15]
1. become bigger
2. become smaller
3. move faster
4. move slower
When the air in a room becomes cooler a hanging balloon blown up with air becomes smaller because the molecules of air? [sm-16]
1. become bigger
2. become smaller
3. move faster
4. move slower
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 20 ^oC? [sm-17]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -142 and -78
2. -95 and 4
3. -66 and 42
4. 90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a solid at 20^oC? [sm-18]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -142 and -78
2. -95 and 4
3. -66 and 42
4. 90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a gas at -60^oC? [sm-19]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -142 and -78
2. -95 and 4
3. -66 and 42
4. 90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a liquid at -10^oC and a gas at 10^oC? [sm-20]

[Substance] Melting Point ^oC and Boiling Point ^oC
1. -142 and -78
2. -95 and 4
3. -66 and 42
4. 90 and 189
Which of the following graphs represents how the temperature of liquid varies as it becomes a solid? [sm-21]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following graphs represents how the temperature of gas varies as it becomes a liquid? [sm-22]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following graphs represents how the temperature of solid varies as it becomes a liquid? [sm-23]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following graphs represents how the temperature of liquid varies as it becomes a gas? [sm-24]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following graphs represents how the temperature of gas varies as it eventually becomes a solid? [sm-25]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following graphs represents how the temperature of solid varies as it eventually becomes a gas? [sm-26]
1. graph 1
2. graph 2
3. graph 3
4. graph 4
Which of the following is true as a gas is changing to a liquid in condensation? [sm-27]
1. increase in particle order
2. temperature rises
3. particles gain more freedom
4. energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-28]
1. decrease in particle order
2. temperature rises
3. particles lose freedom
4. energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-29]
1. decrease in particle order
2. temperature rises
3. particles gain freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-30]
1. increase in particle order
2. temperature falls
3. particles gain freedom
4. energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-31]
1. decrease in particle order
2. temperature stays constant
3. particles gain freedom
4. energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-32]
1. decrease in particle order
2. temperature falls
3. particles lose freedom
4. energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-33]
1. decrease in particle order
2. temperature falls
3. particles gain freedom
4. energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-34]
1. decrease in particle order
2. temperature rises
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-35]
1. increase in particle order
2. temperature stays constant
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-36]
1. increase in particle order
2. temperature rises
3. particles gain freedom
4. energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-37]
1. increase in particle order
2. temperature rises
3. particles lose freedom
4. energy change is endothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-38]
1. decrease in particle order
2. temperature rises
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-39]
1. increase in particle order
2. temperature stays constant
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-40]
1. increase in particle order
2. temperature rises
3. particles gain freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-41]
1. increase in particle order
2. temperature rises
3. particles lose freedom
4. energy change is endothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-42]
1. decrease in particle order
2. temperature stays constant
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-43]
1. increase in particle order
2. temperature falls
3. particles lose freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-44]
1. increase in particle order
2. temperature stays constant
3. particles gain freedom
4. energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-45]
1. increase in particle order
2. temperature stays constant
3. particles lose freedom
4. energy change is endothermic
When water vapour in a cloud is gradually cooled, rainwater is formed. This change of state is called? [sm-46]
1. condensation
2. distillation
3. evaporation
4. saturation
Heat from the Sun changes water from liquid to a gas. This change of state is called? [sm-47]
1. condensation
2. distillation
3. evaporation
4. saturation
Gases diffuse because they? [sm-48]
1. are made of rapidly moving particles
2. have low boiling points
3. have a low density
4. easily move as convection currents
Liquids and dissolving solids diffuse because they? [sm-49]
1. are made of moving particles
2. have low boiling points
3. have a low density
4. easily move as convection currents
The table below shows the melting points and boiling points of substances A to D. Which substance is a gas at 25^oC? [sm-50]

[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = -127^o, bpt = -33 ^oC
2. mpt = -39^o, bpt = 354 ^oC
3. mpt = 63^o, bpt = 760 ^oC
4. mpt = 119^o, bpt = 446 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a liquid at 25^oC? [sm-51]

[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = -127^o, bpt = -33 ^oC
2. mpt = -39^o, bpt = 354 ^oC
3. mpt = 63^o, bpt = 760 ^oC
4. mpt = 119^o, bpt = 446 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100^oC? [sm-52]

[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = -127^o, bpt = -33 ^oC
2. mpt = -39^o, bpt = 354 ^oC
3. mpt = 63^o, bpt = 760 ^oC
4. mpt = 119^o, bpt = 446 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100^oC? [sm-53]

[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = -127^o, bpt = -33 ^oC
2. mpt = -39^o, bpt = 154 ^oC
3. mpt = 99^o, bpt = 140 ^oC
4. mpt = 101^o, bpt = 110 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 10^oC to 90^oC? [sm-54]
[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = 0^o, bpt = 100 ^oC
2. mpt = -200^o, bpt = 40 ^oC
3. mpt = 20^o, bpt = 350 ^oC
4. mpt = -110^o, bpt = 80 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -120^oC to 20^oC? [sm-55]
[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = 0^o, bpt = 100 ^oC
2. mpt = -200^o, bpt = 40 ^oC
3. mpt = -40^o, bpt = 350 ^oC
4. mpt = -110^o, bpt = 80 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 0^oC to 100^oC? [sm-56]
[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = 0^o, bpt = 100 ^oC
2. mpt = -200^o, bpt = 40 ^oC
3. mpt = -40^o, bpt = 350 ^oC
4. mpt = -110^o, bpt = 80 ^oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -4^oC to 50^oC? [sm-57]
[Substance] Melting point ^oC(mpt), Boiling Point ^oC(bpt)
1. mpt = 0^o, bpt = 100 ^oC
2. mpt = -200^o, bpt = 40 ^oC
3. mpt = 40^o, bpt = 350 ^oC
4. mpt = -110^o, bpt = 80 ^oC
The rate of evaporation of a water does NOT depend on the? [sm-58]
1. humidity of the surrounding air
2. depth of the water
3. surface area of the water
4. temperature of the water
Which is true about the rate of evaporation of water? [sm-59]
1. it is speeded up on a humid day
2. it is due to the escape of the most energetic particles
3. heat is given out in the process
4. it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-60]
1. it is speeded up on a dry day
2. it is due to the escape of the least energetic particles
3. heat is given out in the process
4. it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-61]
1. it is speeded up on a humid day
2. it is due to the escape of the least energetic particles
3. heat is absorbed in the process
4. it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-62]
1. it is speeded up on a humid day
2. it is due to the escape of the least energetic particles
3. heat is given out in the process
4. it is speeded up on a breezy day
Which of these statements is true about evaporation? [sm-63]
1. it is speeded up on a warm day
2. it is due to the escape of the least energetic particles
3. heat is given out in the process
4. it is speeded up on a humid day
The body is cooled down by sweating. This process mainly involves the heat transfer process of? [sm-64]
1. conduction
2. convection
3. evaporation
4. radiation
Which of the following describes heat transfer due to evaporation? [sm-65]
1. transfer due to the movement of volumes of gases or liquids
2. transfer due to loss of energetic particles from the surface of a liquid
3. transfer by infrared waves which can pass through air
4. transfer due to the vibration of particles in contact with each other
Which of the following best explains why gases diffuse throughout a container? [sm-66]
1. there are no attractive forces between the particles of a gas
2. gases have a low density
3. gas particles move fast
4. gas particles are very small
Which of the following best explains why gases have a low density? [sm-67]
1. the gas particles are very small
2. the particles are far apart
3. gas particles move fast
4. the attractive force between particles are very weak
Given the following symbol equation:
2Mg + O₂ ==> 2MgO
Calculate how many g of magnesium oxide is formed by burning 24g of magnesium in air.
(Relative atomic masses, A_r: Mg = 24 and O = 16) [com-1]
Given the following symbol equation:
2Mg + O₂ ==> 2MgO
Calculate how many tonne of magnesium is needed to make 80 tonne of magnesium oxide.
(Relative atomic masses, A_r: Mg = 24 and O = 16) [com-2]
Given the following symbol equation:
CaCO_3(s) ==> CaO_(s) + CO_2(g)
Calculate how many kg of calcium carbonate is needed to make 56 kg of calcium oxide.
(Relative atomic masses, A_r: Ca = 40, C = 12 and O = 16) [com-3]
Given the following symbol equation:
CaCO_3(s) ==> CaO_(s) + CO_2(g)
Calculate how many g of carbon dioxide is formed if 25g of calcium carbonate is decomposed on heating to form 14g of calcium oxide.
(Relative atomic masses, A_r: Ca = 40, C = 12 and O = 16) [com-4]
Given the symbol equation to show the formation of iron sulfide:
Fe + S ==> FeS
Calculate the mass in g of iron sulfide formed when 5.6g of iron combines with 3.2g of sulfur.
(Relative atomic masses, A_r: Fe = 56 and S = 32) [com-5]
Given the symbol equation to show the formation of iron sulfide:
Fe + S ==> FeS
Calculate the mass in g of iron sulfide formed when 28g of iron combines with 16g of sulfur.
(Relative atomic masses, A_r: Fe = 56 and S = 32) [com-6]
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine:
Ca_(s) + Cl_2(g) ==> CaCl_2(s)
Calculate the mass in g of calcium chloride formed when 20g of calcium combines with 35.5g of chlorine.
(Relative atomic masses, A_r: Ca = 40 and Cl = 35.5) [com-7]
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine:
Ca_(s) + Cl_2(g) ==> CaCl_2(s)
Calculate the mass in g of chlorine needed when 40g of calcium forms 111g of calcium chloride.
(Relative atomic masses, A_r: Ca = 40 and Cl = 35.5) [com-8]
Given the symbol equation to show the formation of aluminium sulfide by heating a mixture of aluminium and sulfur:
2Al + 3S ==> Al₂S₃
How many g of sulfur is needed if 54g of aluminium is reacted to form 150g of aluminium sulfide?
(Relative atomic masses, A_r: Al = 27 and S = 32) [com-9]
Given the symbol equation to show the formation of aluminium sulfide by heating a mixture of aluminium and sulfur:
2Al + 3S ==> Al₂S₃
How many kg of sulfur is needed if 108kg of aluminium is reacted to form 300kg of aluminium sulfide?
(Relative atomic masses, A_r: Al = 27 and S = 32) [com-10]
Given the symbol equation to show the formation of iron sulfide by heating a mixture of iron and sulfur:
Fe + S ==> FeS
Calculate the mass in g of iron unreacted when 60g of iron reacts with 32g of sulfur to form 88g of iron sulfide.
(Relative atomic masses, A_r: Fe = 56 and S = 32) [com-11]
Given the symbol equation to show the formation of iron sulfide by heating a mixture of iron and sulfur:
Fe + S ==> FeS
Calculate the mass in g of sulfur unreacted when 28g of iron reacts with 22g of sulfur to form 44g of iron sulfide.
(Relative atomic masses, A_r: Fe = 56 and S = 32) [com-12]
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine:
Ca_(s) + Cl_2(g) ==> CaCl_2(s)
Calculate the mass in g of calcium left unreacted when 25g of calcium reacts with 35.5g of chlorine.
(Relative atomic masses, A_r: Ca = 40 and Cl = 35.5) [com-13]
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine:
Ca_(s) + Cl_2(g) ==> CaCl_2(s)
Calculate the mass in g of chlorine left unreacted when 80g of calcium reacts with 150g of chlorine to form 222g of calcium chloride.
(Relative atomic masses, A_r: Ca = 40 and Cl = 35.5) [com-14]
Given the following relative atomic masses: Cu = 64, S = 32 and O = 16; calculate the relative formula mass of copper sulfate, CuSO₄ [rfm-1]
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of ethane, C₂H₆ [rfm-2]
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of octane, C₈H₁₈ [rfm-3]
Given the following relative atomic masses: H = 1, N = 14 and O = 16; calculate the relative formula mass of nitric acid, HNO₃ [rfm-4]
Given the following relative atomic masses: H = 1, N = 14 and O = 16; calculate the relative formula mass of ammonium nitrate, NH₄NO₃ [rfm-5]
Given the following relative atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the relative formula mass of ammonium sulfate, (NH₄)₂SO₄ [rfm-6]
Given the following relative atomic masses: H = 1, O = 16 and S = 32; calculate the relative formula mass of sulfuric acid, H₂SO₄ [rfm-7]
Given the following relative atomic masses: O = 16, Al = 27 and S = 32; calculate the relative formula mass of aluminium sulfate, Al₂(SO₄)₃ [rfm-8]
Given the following relative atomic masses: H = 1 and Cl = 35.5, calculate the relative formula mass of hydrochloric acid, HCl [rfm-9]
Given the following relative atomic masses: Na = 23 and Cl = 35.5, calculate the relative formula mass of sodium chloride, NaCl [rfm-10]
Given the following relative atomic masses: Ca = 40 and Cl = 35.5, calculate the relative formula mass of calcium chloride, CaCl₂ [rfm-11]
Given the following relative atomic masses: H = 1, O = 16 and Mg = 24, calculate the relative formula mass of magnesium hydroxide, Mg(OH)₂ [rfm-12]
Given the following relative atomic masses: Al = 27 and Cl = 35.5, calculate the relative formula mass of aluminium chloride, AlCl₃ [rfm-13]
Given the following relative atomic masses: H = 1, O = 16 and Al = 27, calculate the relative formula mass of aluminium hydroxide, Al(OH)₃ [rfm-14]
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of glucose, C₆H₁₂O₆ [rfm-5]
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of ethanol ('alcohol'), C₂H₅OH [rfm-16]
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of ethanoic acid ('acetic acid'), CH₃COOH [rfm-17]
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of iron(II) oxide, FeO [rfm-18]
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of iron(III) oxide, Fe₂O₃ [rfm-19]
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of the iron oxide, Fe₃O₄ [rfm-20]
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of methane, CH₄ [rfm-21]
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of propane, C₃H₈ [rfm-22]
Given the following relative atomic masses: C = 12 and O = 16; calculate the relative molecular mass of carbon dioxide, CO₂ [rfm-23]
Given the following relative atomic masses: C = 12, O = 16 and Cu = 64; calculate the relative formula mass of copper carbonate, CuCO₃ [rfm-24]
Given the following relative atomic masses: C = 12, O = 16 and Ca = 40; calculate the relative formula mass of calcium carbonate, CaCO₃ [rfm-25]
Which of the following is a test for hydrogen gas? [gt1]
1. Gives a squeaky pop with a lit splint.
2. Relights a glowing red splint.
3. Turns blue litmus red then bleaches it white.
4. Turns red litmus paper blue
5. Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for oxygen gas? [gt2]
1. Gives a squeaky pop with a lit splint.
2. Relights a glowing red splint.
3. Turns blue litmus red then bleaches it white.
4. Turns red litmus paper blue
5. Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for chlorine gas? [gt3]
1. Gives a squeaky pop with a lit splint.
2. Relights a glowing red splint.
3. Turns blue litmus red then bleaches it white.
4. Turns red litmus paper blue
5. Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for ammonia gas? [gt4]
1. Gives a squeaky pop with a lit splint.
2. Relights a glowing red splint.
3. Turns blue litmus red then bleaches it white.
4. Turns red litmus paper blue
5. Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for carbon dioxide gas? [gt5]
1. Gives a squeaky pop with a lit splint.
2. Relights a glowing red splint.
3. Turns blue litmus red then bleaches it white.
4. Turns red litmus paper blue
5. Gives a milky white precipitate with limewater (calcium hydroxide solution).
Heat is taken in when ammonium nitrate dissolves in water. This is an example of? [et-1]
1. electrolysis
2. endothermic charge
3. exothermic change
4. thermal decomposition
Change 1. When calcium carbonate forms calcium oxide and carbon dioxide heat is absorbed.
Change 2. Calcium oxide releases heat when shaken with carbon dioxide.
Which line BEST describes these changes? [et-2]
1. change 1 is endothermic; change 2 is exothermic
2. change 1 is exothermic; change 2 is endothermic
3. change 1 is exothermic; change 2 is exothermic
4. change 1 is endothermic; change 2 is endothermic
When sodium hydroxide dissolves in water the temperature rises. This is an example of? [et-3]
1. electrolysis
2. endothermic charge
3. exothermic change
4. thermal decomposition
The breaking of bonds in a chlorine molecule must be? [et-4]
1. electrolytic
2. endothermic
3. equilibrium
4. exothermic
The making of bonds in forming a hydrogen molecule from hydrogen atoms must be? [et-5]
1. electrolytic
2. endothermic
3. equilibrium
4. exothermic
Change 1. Water is added to blue cobalt chloride, it turns pink and heats up.
Change 2. When pink cobalt chloride is heated, water is driven off, it turns blue and takes in heat.
Which line BEST describes these changes? [et-12]
1. change 1 is endothermic; change 2 is endothermic
2. change 1 is exothermic; change 2 is exothermic
3. change 1 is exothermic; change 2 is endothermic
4. change 1 is endothermic; change 2 is exothermic
Which of the following statements BEST explains why a chemical reaction involving a catalyst goes faster than without the catalyst? [et-22]
1. the catalyst decreases the energy of collisions between reactant particles
2. the catalyst increases the frequency of collisions between reactant particles
3. the catalyst decreases the activation energy for the reaction
4. the catalyst increases the activation energy for the reaction
Which of the following statements BEST explains why a chemical reaction goes slower without a suitable catalyst? [et-23]
1. the catalyst increases the energy of collisions between reactant particles
2. the catalyst increases the frequency of collisions between reactant particles
3. the activation energy is higher for the catalysed reaction
4. the activation energy is higher for the uncatalysed reaction
When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as? [et-24]
1. a decomposition
2. endothermic
3. exothermic
4. activated
When magnesium dissolves in hydrochloric acid the temperature rises. The type of energy change is described as? [et-25]
1. a decomposition
2. endothermic
3. exothermic
4. activated
The reaction between sulfuric acid and zinc is exothermic. During the reaction, which observation is correct? [et-26]
1. a precipitate forms
2. the temperature of the solution decreases
3. the temperature of the solution does not change
4. the temperature of the solution rises
Which of these processes is always exothermic? [et-27]
1. burning
2. evaporation
3. insulation
4. melting
Which of these processes is always exothermic? [et-28]
1. combustion
2. evaporation
3. insulation
4. melting
Which of these process is always endothermic? [et-29]
1. burning
2. condensation
3. evaporation
4. freezing
Which of these process is always endothermic? [et-30]
1. burning
2. condensation
3. freezing
4. melting
Which of these process is always endothermic? [et-31]
1. burning
2. boiling
3. condensation
4. freezing
Which of these process is always exothermic? [et-32]
1. boiling
2. condensing
3. evaporation
4. melting
Which of these process is always exothermic? [et-33]
1. boiling
2. evaporating
3. freezing
4. melting
The chemical change when a fuel burns can be described as? [et-34]
1. an endothermic reaction
2. an exothermic reaction
3. a precipitation
4. a reversible reaction
When ammonium nitrate is added to water, an endothermic reaction occurs and? [et-35]
1. heat is given out
2. the surroundings get hotter
3. the temperature falls
4. the temperature rises
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic? [et-36]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most endothermic? [et-37]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the least exothermic? [et-38]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the least endothermic? [et-39]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-40]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-42]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-43]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-45]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
When an exothermic reaction takes place, the reaction mixture gets hotter because? [et-46]
1. energy is always released in a chemical change which makes new substances
2. exothermic changes always produce gases
3. in an exothermic change the products are less stable than the reactants
4. more energy is released when new bonds are made than is needed to break existing bonds
When an exothermic reaction takes place, the reaction mixture gets hotter because? [et-47]
1. energy is always released in a chemical change which makes new substances
2. exothermic changes always produce gases
3. in an exothermic change the products are more stable than the reactants
4. more energy is absorbed when new bonds are made than is needed to break existing bonds
When an endothermic reaction takes place, the reaction mixture takes in heat because? [et-48]
1. energy is always absorbed in a chemical change which makes new substances
2. endothermic changes always produce energy
3. in an endothermic change the products are more stable than the reactants
4. more energy is absorbed when existing bonds are broken than is given out when new bonds are formed in the products
When an endothermic reaction takes place, the reaction mixture takes in heat because? [et-49]
1. energy is always absorbed in a chemical change which makes new substances
2. endothermic changes always produce energy
3. in an endothermic change the products are less stable than the reactants
4. more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
Energy is needed to make a mixture of methane and oxygen react. The mixture explodes when a lighted splint is applied. What type of energy is supplied by the splint? [et-50]
1. Activation energy
2. Catalyst energy
3. Kinetic energy
4. Renewable energy
Which of these involves a chemical reaction? [et-82]
1. baking bread : 2. boiling water : 3. corroding metals
1. 1 and 2
2. 1 and 3
3. 2 and 3
4. All of them
Which of the following is a chemical change? [et-83]
1. cooling a cup of tea
2. dissolving sugar in coffee
3. lighting a match
4. melting an ice-cube
Which of the following is a physical change? [et-84]
1. dissolving sugar in coffee
2. lighting a match
3. making lime from limestone
4. making polythene from gaseous oil molecules
Which of the following involves a chemical reaction? [et-85]
1. cooking a cake
2. filtering sand from water
3. fractionally distilling oil
4. melting ice
Which of the following results in a chemical reaction? [et-86]
1. adding vinegar to water
2. leaving milk to go sour
3. mixing salt with water
4. stirring sugar with tea
Which of these involves a chemical reaction? [et-87]
1. apples decaying
2. ice melting
3. magnetising iron
4. boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-88]
1. apples decaying
2. frying bacon
3. iron rusting
4. boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-89]
1. apples decaying
2. frying bacon
3. iron rusting
4. freezing water
Which of these involves a chemical reaction? [et-90]
1. crushing apples
2. toasting bread
3. magnetising iron
4. freezing water
Which of these results in chemical change? [et-91]
1. adding lime to vinegar
2. adding milk to tea
3. mixing salt with water
4. mixing iron and sulfur powders
Which of these results ONLY in a physical change? [et-92]
1. adding lime to vinegar
2. leaving bread to go mouldy
3. mixing salt with water
4. adding magnesium to hydrochloric acid
Which of the following temperature changes is NOT the result of a chemical change? [et-93]
1. a fall in temperature as liquid metal cools to solidify
2. a fall in temperature as a precipitate falls
3. a rise in temperature as neutralisation takes place
4. a rise in temperature when a fuel burns
The reaction between hydrogen and chlorine to form hydrogen chloride can be written as:
H₂(g) + Cl₂(g) ===> 2HCl(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen chloride is formed according to the above equation. (Bond energies in kJ/mol: H-H 435, Cl-Cl 245, H-Cl 430) [et-6]
1. 90 kJ given out
2. 180 kJ given out
3. 125 kJ taken in
4. 250 kJ taken in
The reaction between hydrogen and fluorine to form hydrogen fluoride can be written as
H₂(g) + F₂(g) ===> 2HF(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen fluoride is formed according to the above equation. (Bond energies in kJ/mol: H-H 435, F-F 155, H-F 560) [et-7]
1. 15 kJ taken in
2. 30 kJ taken in
3. 265 kJ given out
4. 530 kJ given out
The diagram below shows the reaction profile for the course of a chemical reaction. Which of the following statements is TRUE? [et-8]
1. The reaction is exothermic with an activation energy of 130 kJ/mol
2. The reaction is exothermic and 460 kJ/mol of heat energy is given out
3. The reaction is endothermic with an activation energy of 970 kJ/mol
4. The reaction is endothermic with 460 kJ/mol of heat taken in
The diagram below shows the reaction profile for the course of a chemical reaction. Which of the following statements is TRUE? [et-9]
1. The reaction is exothermic with an activation energy of 970 kJ/mol
2. The reaction is exothermic and 380 kJ/mol of heat energy is given out
3. The reaction is endothermic with an activation energy of 970 kJ/mol
4. The reaction is endothermic with 460 kJ/mol of heat taken in
The diagram below shows the reaction profile for the course of a chemical reaction. Which of the following statements is TRUE? [et-10]
1. The reaction is exothermic with an activation energy of 860 kJ/mol
2. The reaction is exothermic and 380 kJ/mol of heat energy is given out
3. The reaction is endothermic with an activation energy of 310 kJ/mol
4. The reaction is endothermic with 460 kJ/mol of heat taken in
The diagram below shows the reaction profile for the course of a chemical reaction. Which of the following statements is true? [et-11]
1. The reaction is exothermic with an activation energy of 860 kJ/mol
2. The reaction is exothermic and 770 kJ/mol of heat energy is given out
3. The reaction is endothermic with an activation energy of 860 kJ/mol
4. The reaction is endothermic with 220 kJ/mol of heat taken in
The chemical equation shows how water is formed from its elements.
2H₂ + O₂ ==> 2H₂O
The bond energies in kJ/mol are: H-H 440; O=O 500; H-O 460
How much energy is released when two moles of water are formed? [et-13]
1. 460 kJ
2. 480 kJ
3. 920 kJ
4. 2300 kJ
The reaction between hydrogen and bromine to form hydrogen bromide can be written as
H₂(g) + Br₂(g) ===> 2HBr(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen bromide is formed according to the above equation. (Bond energies in kJ/mol: H-H 435; Br-Br 200; H-Br 370) [et-14]
1. 105 kJ given out
2. 105 kJ taken in
3. 270 kJ given out
4. 270 kJ taken in
Which of the following reaction profiles represents an exothermic reaction with no activation energy? [et-15]
Which of the following reaction profiles represents an endothermic reaction with no activation energy? [et-16]
Which of the following reaction profiles represents a reaction with an activation energy but with no overall energy change? [et-17]
Which of the following reaction profiles represents an exothermic reaction with a small activation energy? [et-18]
Which of the following reaction profiles represents an endothermic reaction with a large activation energy? [et-19]
Which of the following reaction profiles represents an exothermic reaction with a large activation energy? [et-20]
Which of the following reaction profiles represents an endothermic reaction with a small activation energy? [et-21]
Which of the following energy changes corresponds to the activation energy required for the revervse or backward reaction to take place? [et-41]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the activation energy required for the reverse or backward reaction to take place? [et-44]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
An energy level diagram can be used to show the energy changes involved in the course of a chemical reaction. The reaction must be? [et-51]
1. an exothermic reaction
2. a thermal decomposition
3. an endothermic reaction
4. a reaction with zero activation energy
An energy level diagram can be used to show the energy changes involved in the course of a chemical reaction. The reaction must be? [et-52]
1. a combustion reaction
2. a thermal decomposition
3. an endothermic reaction
4. a reaction with zero activation energy
An energy level diagram can be used to show the energy changes involved in the course of a chemical reaction. The reaction must be? [et-53]
1. an exothermic reaction
2. a combustion reaction
3. an endothermic reaction
4. a reaction with zero activation energy
The diagram shows the energy changes during a reaction. What would occur if a catalyst was used?[et-54]
1. energy change 1 is lowered
2. energy change 2 is raised
3. energy change 3 is lowered
4. energy change 4 is raised
The diagram shows the energy changes during a reaction. What would occur if a catalyst was used?[et-55]
1. energy change 1 is lowered
2. energy change 2 is raised
3. energy change 3 is lowered
4. energy change 4 is raised
The digram shows the profile of the energy changes for a reaction. Which energy change is reduced by using a suitable catalyst? [et-56]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
The digram shows the profile of the energy changes for a reaction. Which energy change is reduced by using a suitable catalyst? [et-57]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
The digram shows the profile of the energy changes for a reaction. Which energy change represents the energy needed to break chemical bonds so that new products can form? [et-58]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
The digram shows the profile of the energy changes for a reaction. Which energy change represents the energy needed to break chemical bonds so that new products can form? [et-59]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
For the reaction: 3H₂ + N₂ ==> 2NH₃
The breaking of bonds in a hydrogen molecule when it combines with nitrogen to form ammonia must be? [et-60]
1. electrolytic
2. electrostatic
3. endothermic
4. exothermic
For the reaction: 3H₂ + N₂ ==> 2NH₃
The breaking of bonds in a nitrogen molecule when it combines with hydrogen to form ammonia must be? [et-61]
1. electrolytic
2. electrostatic
3. endothermic
4. exothermic
For the reaction: 3H₂ + N₂ ==> 2NH₃
The forming of bonds in an ammonia molecule when hydrogen combines with nitrogen must be? [et-62]
1. electrolytic
2. electrostatic
3. endothermic
4. exothermic
The equation for the formation of ammonia from its elements is:
3H₂ + N₂ ==> 2NH₃
Given the BOND ENERGIES in kJ/mol for H-H = 440; N-N = 940; N-H = 390, calculate the energy released when 2 moles of ammonia are formed. [et-63]
1. 80 kJ
2. 90 kJ
3. 990 kJ
4. 1110 kJ
The reaction between hydrogen and iodine to form hydrogen iodide can be written as
H₂(g) + I₂(g) ===> 2HI(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen iodide is formed according to the above equation. (Bond energies in kJ/mol: H-H 440, I-I 150, H-I 300) [et-64]
1. 10 kJ given out
2. 10 kJ taken in
3. 600 kJ given out
4. 590 kJ taken in
When hydrogen fluoride is heated it breaks down into hydrogen and fluorine.
The equation can be written as: 2HF_(g) ==> H_2(g) + F_2(g)
Use the bond energies shown below to calculate the energy change that takes place when 2 moles of hydrogen fluoride thermally decomposes in this way. (bond energies in kJ/mol: H-H = 440; F-F = 155; H-F = 560) [et-65]
1. 525 kJ taken in
2. 525 kJ given out
3. 560 kJ given out
4. 560 kJ taken in
When hydrogen chloride is heated it breaks down into hydrogen and fluorine.
The equation can be written as: 2HCl_(g) ==> H_2(g) + Cl_2(g)
Use the bond energies shown below to calculate the energy change that takes place when 2 moles of hydrogen chloride thermally decomposes in this way. (bond energies in kJ/mol: H-H = 440; Cl-Cl = 245; H-Cl = 430) [et-66]
1. 175 kJ given out
2. 175 kJ taken in
3. 860 kJ given out
4. 685 kJ taken in
When hydrogen bromide is heated it breaks down into hydrogen and bromine.
The equation can be written as: 2HBr_(g) ==> H_2(g) + Br_2(g)
Use the bond energies shown below to calculate the energy change that takes place when 2 moles of hydrogen bromide thermally decomposes in this way. (bond energies in kJ/mol: H-H = 440; Br-Br = 200; H-Br = 370) [et-67]
1. 740 kJ given out
2. 640 kJ taken in
3. 100 kJ taken in
4. 100 kJ given out
When hydrogen iodide is heated it breaks down into hydrogen and iodine.
The equation can be written as: 2HI_(g) ==> H_2(g) + I_2(g)
Use the bond energies shown below to calculate the energy change that takes place when 2 moles of hydrogen iodide thermally decomposes in this way. (bond energies in kJ/mol: H-H = 440; I-I = 150; H-I = 300) [et-68]
1. 600 kJ given out
2. 600 kJ taken in
3. 10 kJ given out
4. 10 kJ taken in
Methane molecules, CH₄, can be broken down into gaseous carbon and hydrogen atoms. The energy needed to break the bonds to do this is 1664 kJ/mol. Therefore the average C-H bond energy in the molecule is? [et-69]
1. 416 kJ
2. 832 kJ
3. 1664 kJ
4. 6656 kJ
Ammonia molecules, NH₃, can be broken down into gaseous nitrogen and hydrogen atoms. The energy needed to break the bonds to do this is 1164 kJ/mol. Therefore the average N-H bond energy in the molecule is? [et-70]
1. 388 kJ
2. 582 kJ
3. 1164 kJ
4. 291 kJ
Water molecules, H₂O, can be broken down into gaseous oxygen and hydrogen atoms. The energy needed to break the bonds to do this is 928 kJ/mol. Therefore the average O-H bond energy in the molecule is? [et-71]
1. 116 kJ
2. 232 kJ
3. 464 kJ
4. 928 kJ
The diagram shows the energy changes as a reaction proceeds. For a reaction to be exothermic which of the following must be positive? [et-72]
1. Y + X - W
2. Y - X + W
3. W - Y
4. X - Y
The diagram shows the energy changes as a reaction proceeds. Which of the following is the activation energy? [et-73]
1. W - X
2. W + X - Y
3. W - Y
4. X - Y
The diagram shows the energy changes as a reaction proceeds. Which of the following is the overall energy change? [et-74]
1. W - X given out
2. W - X taken in
3. X - Y given out
4. X - Y taken in
The diagram shows the energy changes as a reaction proceeds. For a reaction to be endothermic which of the following must be positive? [et-75]
1. W - X
2. W - Y
3. W + X - Y
4. X - Y
The diagram shows the energy changes as a reaction proceeds. Which of the following is the activation energy? [et-76]
1. Y + X - W
2. Y - X + W
3. X - Y
4. W - Y
The diagram shows the energy changes as a reaction proceeds. Which of the following is the overall energy change? [et-77]
1. X - Y given out
2. W - Y taken in
3. X - Y given out
4. X - Y taken in
Sodium hydroxide and dilute hydrochloric acid react together to form sodium chloride without being heated. This is because the? [et-78]
1. the activation energy is high
2. the activation energy is low
3. the activation energy is zero
4. the reaction is exothermic
Natural gas and the oxygen in air will only react when heated. This is because the reaction? [et-79]
1. has a zero activation energy
2. has a low activation energy
3. is exothermic
4. has a high activation energy
The diagram shows the energy changes as a reaction proceeds. If a suitable catalyst is used, which of the following energy changes occurs? [et-80]
1. W - X is increased
2. W - X is reduced
3. X - Y is increased
4. X - Y is reduced
The diagram shows the energy changes as a reaction proceeds. If a suitable catalyst is used, which of the following energy changes occurs? [et-81]
1. W - X is increased
2. W - X is reduced
3. X - Y is increased
4. X - Y is reduced

best gift deals latest video game release, best gift deals best bargains in shop sales latest pop music releases, best sales deals download free music, latest film releases, best gifts for teenagers latest high street fashion in clothes, fashionable trending in clothing, best gift deals best bargains in shop salesgirls buy clothes, spend a lot of money on clothes, best sales deals shoes, sweets and chocolates, magazines and make-up best gifts for teenagers Boys buy food and drink, computer games best gift deals best bargains in shop sales DVDs and CDs, girls and boys spend a lot of money on credit for mobile phones best sales deals best bargains in shop sales buses and trains to transport them going out best gifts for teenagers best bargains in shop sales Girls spend a lot of money on clothes best gift deals color colour preferences in clothes, cool sunglasses best sales deals boys buy expensive thins like best gifts for teenagers designer sports clothes and trainers, teenagers save for holidays, best sales deals clothes, mobile phones, birthday presents and electronic goods, teenage accessories, Favourite style of jeans. best gifts for teenagers A typical girl’s shopping list includes mobile phone credit deals best gift deals fashionable quality cool airpods, air pods, fashionable clothes best sales deals the most popular favourite sneakers best gifts for teenagers fancy shoes, sweets, chocolates, magazines, best gift deals best bargains in shop sales lip moisturizer best bargains in shop sale slots on make-up, well being, teenage decor decorating their room best sales deals teenagers like LED string lantern lights, best gifts for teenagers beauty products for teenagers, denim jackets, scrunchies coolness, fashionable back packs, typical boy’s shopping list includes mobile credit deals, eating out takeaway food and drinks, what teenagers like to buy in clothes best gifts for teenagers computer games, DVDs, CDs, what teenagers talk about best gift deals what teenagers worry about, what teenagers like to do for fun sports best sales deals what cool things do teenagers buy, resale websites like eBay Teenager

OCR GCSE 9-1 Twenty First Century Chemistry/Combined Science Suite B
Chemistry QUIZ on Chapter C1 "AIR and WATER" (Higher Tier)

CLICK [?] read feedback. EMAIL query?, BUT quote Q database number [??-xx] © Doc Brown's Chemistry

OCR GCSE 9-1 Twenty First Century Chemistry/Combined Science Suite BChemistry QUIZ on Chapter C1 "AIR and WATER" (Higher Tier)

CLICK [?] read feedback. EMAIL query?, BUT quote Q database number [??-xx] © Doc Brown's Chemistry

OCR GCSE 9-1 Twenty First Century Chemistry/Combined Science Suite B
Chemistry QUIZ on Chapter C1 "AIR and WATER" (Higher Tier)