QUIZ "Energy changes" easier-foundation GCSE level chemistry at Doc Brown's Chemistry

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

QUIZ "Energy changes" easier-foundation GCSE level © Doc Brown's Chemistry