AQA GCSE (9-1) CHEMISTRY QUIZ on TOPIC 5 "ENERGY CHANGES" (for combined science trilogy too)

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. 100 kJ given out
2. 100 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 reverse 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 diagram 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 diagram 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 diagram 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 diagram 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 ? [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 ? [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

AQA GCSE (9-1) CHEMISTRY QUIZ on TOPIC 5 "ENERGY CHANGES" (for combined science trilogy too)

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