Questions as text
Q1 · A fuel used for cooking food is the hydrocarbon …X… that burns in an …Y… reaction 0654/11 May/June 2006
24 A fuel used for cooking food is the hydrocarbon …X… that burns in an …Y… reaction. Which words correctly complete gaps X and Y? X Y A coke endothermic B coke exothermic C methane endothermic D methane exothermic
1 marks
Answer: D
This question in 0654/11 May/June 2006
Q2 · The diagram shows acid being added to an alkali until it is neutralised 0654/11 Oct/Nov 2006
21 The diagram shows acid being added to an alkali until it is neutralised. acid flask alkali What happens in the flask? temperature type of reaction A decreases endothermic B decreases exothermic C increases endothermic D increases exothermic
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2006
Q3 · An acid reacts with an alkali 0654/11 Oct/Nov 2009
21 An acid reacts with an alkali. Which type of reaction and which temperature change takes place? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2009
Q4 · Sodium hydroxide solution is added to hydrochloric acid 0654/11 May/June 2011
22 Sodium hydroxide solution is added to hydrochloric acid. thermometer sodium hydroxide solution hydrochloric acid Which shows how the pH and temperature change as the reaction takes place? pH temperature A decrease decrease B decrease increase C increase decrease D increase increase
1 marks
Answer: D
This question in 0654/11 May/June 2011
Q5 · Which statement about methane is not correct? 0654/11 May/June 2011
26 Which statement about methane is not correct? A Methane burns in air to form carbon dioxide and water. B Methane can be obtained from the decay of waste material. C Methane is a fossil fuel. D When methane burns, an endothermic reaction takes place.
1 marks
Answer: D
This question in 0654/11 May/June 2011
Q6 · Sodium hydroxide solution is added to hydrochloric acid 0654/12 May/June 2011
21 Sodium hydroxide solution is added to hydrochloric acid. thermometer sodium hydroxide solution hydrochloric acid Which shows how the pH and temperature change as the reaction takes place? pH temperature A decrease decrease B decrease increase C increase decrease D increase increase
1 marks
Answer: D
This question in 0654/12 May/June 2011
Q7 · Which statement about methane is not correct? 0654/12 May/June 2011
24 Which statement about methane is not correct? A Methane burns in air to form carbon dioxide and water. B Methane can be obtained from the decay of waste material. C Methane is a fossil fuel. D When methane burns, an endothermic reaction takes place.
1 marks
Answer: D
This question in 0654/12 May/June 2011
Q8 · Sodium hydroxide solution is added to hydrochloric acid 0654/13 May/June 2011
21 Sodium hydroxide solution is added to hydrochloric acid. thermometer sodium hydroxide solution hydrochloric acid Which shows how the pH and temperature change as the reaction takes place? pH temperature A decrease decrease B decrease increase C increase decrease D increase increase
1 marks
Answer: D
This question in 0654/13 May/June 2011
Q9 · Which statement about methane is not correct? 0654/13 May/June 2011
24 Which statement about methane is not correct? A Methane burns in air to form carbon dioxide and water. B Methane can be obtained from the decay of waste material. C Methane is a fossil fuel. D When methane burns, an endothermic reaction takes place.
1 marks
Answer: D
This question in 0654/13 May/June 2011
Q10 · What happens when an acid reacts with an alkali? 0654/11 Oct/Nov 2011
22 What happens when an acid reacts with an alkali? A Neutralisation takes place and the temperature falls. B Neutralisation takes place and the temperature rises. C Reduction takes place and the temperature falls. D Reduction takes place and the temperature rises.
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2011
Q11 · What happens when an acid reacts with an alkali? 0654/12 Oct/Nov 2011
23 What happens when an acid reacts with an alkali? A Neutralisation takes place and the temperature falls. B Neutralisation takes place and the temperature rises. C Reduction takes place and the temperature falls. D Reduction takes place and the temperature rises.
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2011
Q12 · What happens when an acid reacts with an alkali? 0654/13 Oct/Nov 2011
24 What happens when an acid reacts with an alkali? A Neutralisation takes place and the temperature falls. B Neutralisation takes place and the temperature rises. C Reduction takes place and the temperature falls. D Reduction takes place and the temperature rises.
1 marks
Answer: B
This question in 0654/13 Oct/Nov 2011
Q13 · An acid is added to an alkali until the final solution is just neutral 0654/11 May/June 2013
26 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: D
This question in 0654/11 May/June 2013
Q14 · An acid is added to an alkali until the final solution is just neutral 0654/12 May/June 2013
24 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: D
This question in 0654/12 May/June 2013
Q15 · An acid is added to an alkali until the final solution is just neutral 0654/13 May/June 2013
25 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: D
This question in 0654/13 May/June 2013
Q16 · The table shows the temperature of some water before and after a solid is dissolved in it 0654/11 Oct/Nov 2013
17 The table shows the temperature of some water before and after a solid is dissolved in it. Which change is the most exothermic? temperature before temperature after / °C / °C A 20 18 B 20 40 C 25 18 D 25 42
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2013
Q17 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/11 Oct/Nov 2013
25 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2013
Q18 · The table shows the temperature of some water before and after a solid is dissolved in it 0654/12 Oct/Nov 2013
19 The table shows the temperature of some water before and after a solid is dissolved in it. Which change is the most exothermic? temperature before temperature after / °C / °C A 20 18 B 20 40 C 25 18 D 25 42
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2013
Q19 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/12 Oct/Nov 2013
25 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/12 Oct/Nov 2013
Q20 · The diagram shows the energy change for the reactions between hydrogen and the halogens 0654/13 Oct/Nov 2013
16 The diagram shows the energy change for the reactions between hydrogen and the halogens. The size of the energy change is different for each halogen. H2 + X2 energy change energy 2HX reaction The reaction is H2 + X2 → 2HX The diagram shows that the reactions are ……1…… . The most reactive halogen is ……2…… and therefore the energy change for this element is ……3…… . Which words complete gaps 1, 2 and 3? 1 2 3 A endothermic fluorine least B endothermic iodine least C exothermic fluorine greatest D exothermic iodine greatest
1 marks
Answer: C
This question in 0654/13 Oct/Nov 2013
Q21 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/13 Oct/Nov 2013
24 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2013
Q22 · A pupil wants to find out if the reaction of 25 cm3 of an acid with 25 cm3 of an alkali… 0654/11 May/June 2014
18 A pupil wants to find out if the reaction of 25 cm3 of an acid with 25 cm3 of an alkali is exothermic. Which two pieces of apparatus are needed? A balance and measuring cylinder B Bunsen burner and measuring cylinder C Bunsen burner and thermometer D thermometer and measuring cylinder
1 marks
Answer: D
This question in 0654/11 May/June 2014
Q23 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/11 May/June 2014
19 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker feels cooler. D The beaker feels warmer.
1 marks
Answer: D
This question in 0654/11 May/June 2014
Q24 · The table shows the initial and final temperatures of four different experiments 0654/12 May/June 2014
18 The table shows the initial and final temperatures of four different experiments. initial temperature final temperature reaction / °C / °C 1 20 20 2 20 30 3 25 20 4 25 30 Which reactions are exothermic? A 1 and 3 B 2 and 3 C 2 and 4 D 3 and 4
1 marks
Answer: C
This question in 0654/12 May/June 2014
Q25 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/12 May/June 2014
19 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker feels cooler. D The beaker feels warmer.
1 marks
Answer: D
This question in 0654/12 May/June 2014
Q26 · A pupil wants to find out if the reaction of 25 cm3 of an acid with 25 cm3 of an alkali… 0654/13 May/June 2014
19 A pupil wants to find out if the reaction of 25 cm3 of an acid with 25 cm3 of an alkali is exothermic. Which two pieces of apparatus are needed? A balance and measuring cylinder B Bunsen burner and measuring cylinder C Bunsen burner and thermometer D thermometer and measuring cylinder
1 marks
Answer: D
This question in 0654/13 May/June 2014
Q27 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/13 May/June 2014
20 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker feels cooler. D The beaker feels warmer.
1 marks
Answer: D
This question in 0654/13 May/June 2014
Q28 · When a match is struck, heat and light energy are produced 0654/11 Oct/Nov 2014
19 When a match is struck, heat and light energy are produced. Which row describes the type of change and the type of reaction taking place? type of change type of reaction A chemical endothermic B chemical exothermic C physical endothermic D physical exothermic
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2014
Q29 · When a match is struck, heat and light energy are produced 0654/12 Oct/Nov 2014
20 When a match is struck, heat and light energy are produced. Which row describes the type of change and the type of reaction taking place? type of change type of reaction A chemical endothermic B chemical exothermic C physical endothermic D physical exothermic
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2014
Q30 · When sodium is added to water it reacts violently and melts 0654/13 Oct/Nov 2014
20 When sodium is added to water it reacts violently and melts. Which row describes the type of reaction and how the temperature of the water changes during the reaction? type of temperature of reaction the water A endothermic decreases B endothermic increases C exothermic decreases D exothermic increases
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2014
Q31 · Which change occurs in all exothermic reactions? 0654/11 May/June 2015
17 Which change occurs in all exothermic reactions? A Bubbles of gas are released from the mixture. B Light energy is produced. C The temperature of the mixture decreases. D The temperature of the mixture increases.
1 marks
Answer: D
This question in 0654/11 May/June 2015
Q32 · A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction 0654/11 May/June 2015
27 A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction. Which words correctly complete gaps 1 and 2? 1 2 A coke endothermic B coke exothermic C methane endothermic D methane exothermic
1 marks
Answer: D
This question in 0654/11 May/June 2015
Q33 · When sodium hydroxide and hydrochloric acid are mixed they react immediately 0654/12 May/June 2015
17 When sodium hydroxide and hydrochloric acid are mixed they react immediately. The graph shows how the temperature of the mixture changes over time. 35 30 25 temperature 20 / °C 15 10 5 0 0 50 100 150 200 250 300 time / s Which type of chemical reaction takes place? A both endothermic and exothermic B endothermic C exothermic D neither endothermic nor exothermic
1 marks
Answer: C
This question in 0654/12 May/June 2015
Q34 · A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction 0654/12 May/June 2015
27 A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction. Which words correctly complete gaps 1 and 2? 1 2 A coke endothermic B coke exothermic C methane endothermic D methane exothermic
1 marks
Answer: D
This question in 0654/12 May/June 2015
Q35 · Which statement about the energetics of a reaction is correct? 0654/13 May/June 2015
17 Which statement about the energetics of a reaction is correct? A In an endothermic reaction heat is given out and the temperature decreases. B In an endothermic reaction heat is taken in and the temperature increases. C In an exothermic reaction heat is given out and the temperature increases. D In an exothermic reaction heat is taken in and the temperature decreases.
1 marks
Answer: C
This question in 0654/13 May/June 2015
Q36 · A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction 0654/13 May/June 2015
27 A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction. Which words correctly complete gaps 1 and 2? 1 2 A coke endothermic B coke exothermic C methane endothermic D methane exothermic
1 marks
Answer: D
This question in 0654/13 May/June 2015
Q37 · Lime is manufactured by heating limestone 0654/11 Oct/Nov 2015
20 Lime is manufactured by heating limestone. Lime is used to control the acidity of soil. Which types of chemical change occur in these two reactions? heating limestone controlling acidity A endothermic oxidation B endothermic neutralisation C exothermic oxidation D exothermic neutralisation
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2015
Q38 · Lime is manufactured by heating limestone 0654/12 Oct/Nov 2015
20 Lime is manufactured by heating limestone. Lime is used to control the acidity of soil. Which types of chemical change occur in these two reactions? heating limestone controlling acidity A endothermic oxidation B endothermic neutralisation C exothermic oxidation D exothermic neutralisation
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2015
Q39 · Lime is manufactured by heating limestone 0654/13 Oct/Nov 2015
19 Lime is manufactured by heating limestone. Lime is used to control the acidity of soil. Which types of chemical change occur in these two reactions? heating limestone controlling acidity A endothermic oxidation B endothermic neutralisation C exothermic oxidation D exothermic neutralisation
1 marks
Answer: B
This question in 0654/13 Oct/Nov 2015
Q40 · Which statement about chemical reactions is correct? 0654/11 May/June 2016
18 Which statement about chemical reactions is correct? A Endothermic reactions result in a temperature decrease. B Endothermic reactions result in a temperature increase. C Exothermic reactions always produce a large temperature rise. D Exothermic reactions always produce a small temperature rise.
1 marks
Answer: A
This question in 0654/11 May/June 2016
Q41 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/11 Oct/Nov 2016
18 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2016
Q42 · Which process and type of reaction describes the formation of lime from limestone? 0654/11 Oct/Nov 2016
26 Which process and type of reaction describes the formation of lime from limestone? process type of reaction A addition of water endothermic B thermal decomposition endothermic C addition of water exothermic D thermal decomposition exothermic
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2016
Q43 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/12 Oct/Nov 2016
18 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/12 Oct/Nov 2016
Q44 · Which type of reaction and which temperature change take place when an acid reacts with… 0654/13 Oct/Nov 2016
18 Which type of reaction and which temperature change take place when an acid reacts with an alkali? type of reaction temperature change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2016
Q45 · When sodium is added to water it reacts violently and melts 0654/11 May/June 2017
17 When sodium is added to water it reacts violently and melts. Which row describes the type of reaction and how the temperature of the water changes during the reaction? type of temperature of reaction the water A endothermic decreases B endothermic increases C exothermic decreases D exothermic increases
1 marks
Answer: D
This question in 0654/11 May/June 2017
Q46 · When sodium is added to water it reacts violently and melts 0654/12 May/June 2017
18 When sodium is added to water it reacts violently and melts. Which row describes the type of reaction and how the temperature of the water changes during the reaction? type of temperature of reaction the water A endothermic decreases B endothermic increases C exothermic decreases D exothermic increases
1 marks
Answer: D
This question in 0654/12 May/June 2017
Q47 · When sodium is added to water it reacts violently and melts 0654/13 May/June 2017
17 When sodium is added to water it reacts violently and melts. Which row describes the type of reaction and how the temperature of the water changes during the reaction? type of temperature of reaction the water A endothermic decreases B endothermic increases C exothermic decreases D exothermic increases
1 marks
Answer: D
This question in 0654/13 May/June 2017
Q48 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/11 Oct/Nov 2017
19 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker becomes cooler. D The beaker becomes warmer.
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2017
Q49 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/12 Oct/Nov 2017
19 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker becomes cooler. D The beaker becomes warmer.
1 marks
Answer: D
This question in 0654/12 Oct/Nov 2017
Q50 · Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred 0654/13 Oct/Nov 2017
19 Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. Which observation shows that the process is exothermic? A A blue solution forms. B A colourless solution forms. C The beaker becomes cooler. D The beaker becomes warmer.
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2017
Q51 · Methane is used as a fuel 0654/11 Oct/Nov 2018
18 Methane is used as a fuel. Which row describes the temperature change and the type of reaction when methane burns? temperature type of change reaction A decrease endothermic B decrease exothermic C increase endothermic D increase exothermic
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2018
Q52 · Lime is manufactured from calcium carbonate 0654/12 Oct/Nov 2018
19 Lime is manufactured from calcium carbonate. Which type of reaction is involved in this process? A endothermic B neutralisation C precipitation D reduction
1 marks
Answer: A
This question in 0654/12 Oct/Nov 2018
Q53 · Solid sodium hydroxide reacts with dilute hydrochloric acid 0654/13 Oct/Nov 2018
18 Solid sodium hydroxide reacts with dilute hydrochloric acid. Which change shows that the reaction is exothermic? A A gas is produced. B The mass increases. C The pH increases. D The temperature increases.
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2018
Q54 · An acid is added to an alkali until the final solution is just neutral 0654/11 May/June 2019
17 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: C
This question in 0654/11 May/June 2019
Q55 · An acid is added to an alkali until the final solution is just neutral 0654/12 May/June 2019
18 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: C
This question in 0654/12 May/June 2019
Q56 · An acid is added to an alkali until the final solution is just neutral 0654/13 May/June 2019
18 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid
1 marks
Answer: C
This question in 0654/13 May/June 2019
Q57 · The table shows the temperature of some water before and after a solid is dissolved in it 0654/11 Oct/Nov 2019
19 The table shows the temperature of some water before and after a solid is dissolved in it. Which change is the most exothermic? temperature before temperature after / °C / °C A 20 18 B 20 40 C 25 18 D 25 42
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2019
Q58 · The table shows the temperature of some water before and after a solid is dissolved in it 0654/12 Oct/Nov 2019
18 The table shows the temperature of some water before and after a solid is dissolved in it. Which change is the most exothermic? temperature before temperature after / °C / °C A 20 18 B 20 40 C 25 18 D 25 42
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2019
Q59 · The table shows the temperature of some water before and after a solid is dissolved in it 0654/13 Oct/Nov 2019
17 The table shows the temperature of some water before and after a solid is dissolved in it. Which change is the most exothermic? temperature before temperature after / °C / °C A 20 18 B 20 40 C 25 18 D 25 42
1 marks
Answer: B
This question in 0654/13 Oct/Nov 2019
Q60 · A student investigates temperature changes in four chemical reactions, as shown 0654/11 May/June 2020
18 A student investigates temperature changes in four chemical reactions, as shown. initial temperature final temperature reaction / °C / °C 1 22 16 2 22 27 3 20 28 4 20 18 Which reactions are endothermic? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
1 marks
Answer: B
This question in 0654/11 May/June 2020
Q61 · Equal amounts of four different substances are added to equal volumes of the same acid of… 0654/12 May/June 2020
18 Equal amounts of four different substances are added to equal volumes of the same acid of the same concentration in reactions W, X, Y and Z. The initial temperature of the acid before each reaction is 21 °C. The final temperatures of the mixtures are measured. The results are shown. reaction W X Y Z final temperature / °C 28 19 26 17 Which row is correct? most endothermic most exothermic reaction reaction A W Z B Z W C X Y D Y X
1 marks
Answer: B
This question in 0654/12 May/June 2020
Q62 · Which statement describes the meaning of exothermic? 0654/11 Oct/Nov 2020
18 Which statement describes the meaning of exothermic? A Heat energy is given out. B Heat energy is taken in. C Oxygen is given out. D Oxygen is taken in.
1 marks
Answer: A
This question in 0654/11 Oct/Nov 2020
Q63 · Two processes are listed 0654/12 Oct/Nov 2020
18 Two processes are listed. 1 the conversion of liquid water into steam 2 the combustion of magnesium ribbon Which row describes the two processes? process 1 process 2 A endothermic endothermic B endothermic exothermic C exothermic endothermic D exothermic exothermic
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2020
Q64 · The initial and final temperatures of four different experiments are measured 0654/13 Oct/Nov 2020
18 The initial and final temperatures of four different experiments are measured. Which experiment is the most endothermic? initial final temperature / C temperature / C A 20 19 B 20 27 C 21 26 D 22 20
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2020
Q65 · The diagram shows the energy change for the reactions between hydrogen and the halogens 0654/12 Feb/March 2021
17 The diagram shows the energy change for the reactions between hydrogen and the halogens. The reaction is H2 + X2 2HX. The size of the energy change is different for each halogen. H2 + X2 energy change energy 2HX progress of reaction The diagram shows that the reactions are ……1…… . The most reactive halogen is ……2…… and therefore the energy change for this element is ……3…… . Which words complete gaps 1, 2 and 3? 1 2 3 A endothermic fluorine least B endothermic iodine least C exothermic fluorine greatest D exothermic iodine greatest
1 marks
Answer: C
This question in 0654/12 Feb/March 2021
Q66 · Which statements about ethanol are correct? 0654/12 Feb/March 2021
27 Which statements about ethanol are correct? 1 The combustion of ethanol is exothermic. 2 Ethanol is used as a solvent. 3 Ethanol is produced by fermentation. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only
1 marks
Answer: A
This question in 0654/12 Feb/March 2021
Q67 · Hydrogen reacts with iodine to form hydrogen iodide 0654/12 May/June 2021
17 Hydrogen reacts with iodine to form hydrogen iodide. The equation for this reaction is shown. H2 + I2 2HI During this reaction the temperature increases. Which statement explains why the temperature increases? A One molecule of hydrogen is forming two molecules of hydrogen iodide. B The reaction is exothermic. C The reaction is very fast. D The reaction takes in energy.
1 marks
Answer: B
This question in 0654/12 May/June 2021
Q68 · Hydrogen reacts with iodine to form hydrogen iodide 0654/13 May/June 2021
17 Hydrogen reacts with iodine to form hydrogen iodide. The equation for this reaction is shown. H2 + I2 2HI During this reaction the temperature increases. Which statement explains why the temperature increases? A One molecule of hydrogen is forming two molecules of hydrogen iodide. B The reaction is exothermic. C The reaction is very fast. D The reaction takes in energy.
1 marks
Answer: B
This question in 0654/13 May/June 2021
Q69 · The initial and final temperatures of four different experiments are measured 0654/11 Oct/Nov 2021
18 The initial and final temperatures of four different experiments are measured. The results are shown. Which experiment is the most endothermic? initial final temperature temperature / C / C A 22 17 B 21 25 C 20 27 D 20 18
1 marks
Answer: A
This question in 0654/11 Oct/Nov 2021
Q70 · Magnesium ribbon is added to dilute hydrochloric acid 0654/12 Oct/Nov 2021
18 Magnesium ribbon is added to dilute hydrochloric acid. Which observation shows that this process is exothermic? A The pH of the solution decreases. B The pH of the solution increases. C The temperature of the solution decreases. D The temperature of the solution increases.
1 marks
Answer: D
This question in 0654/12 Oct/Nov 2021
Q71 · The same masses of four substances are added separately to four samples of 10 cm3 of… 0654/13 Oct/Nov 2021
18 The same masses of four substances are added separately to four samples of 10 cm3 of dilute hydrochloric acid at 22 C. The final temperature of each reaction mixture is measured. Which reaction is most endothermic? final temperature / C A 29 B 27 C 20 D 17
1 marks
Answer: D
This question in 0654/13 Oct/Nov 2021
Q72 · Ammonium nitrate is dissolved in a beaker of water 0654/12 Feb/March 2022
17 Ammonium nitrate is dissolved in a beaker of water. The temperature of the water decreases by 5 C. Which type of reaction occurs? A endothermic B exothermic C oxidation D reduction
1 marks
Answer: A
This question in 0654/12 Feb/March 2022
Q73 · Hydrogen reacts with iodine to form hydrogen iodide 0654/11 May/June 2022
18 Hydrogen reacts with iodine to form hydrogen iodide. The equation for this reaction is shown. H2 + I2 2HI During this reaction the temperature increases. Which statement explains why the temperature increases? A One molecule of hydrogen is forming two molecules of hydrogen iodide. B The reaction is exothermic. C The reaction is very fast. D The reaction takes in energy.
1 marks
Answer: B
This question in 0654/11 May/June 2022
Q74 · Which word describes reactions that give out heat energy? 0654/12 May/June 2022
18 Which word describes reactions that give out heat energy? A endothermic B exothermic C oxidation D reduction
1 marks
Answer: B
This question in 0654/12 May/June 2022
Q75 · Which word describes reactions that give out heat energy? 0654/13 May/June 2022
18 Which word describes reactions that give out heat energy? A endothermic B exothermic C oxidation D reduction
1 marks
Answer: B
This question in 0654/13 May/June 2022
Q76 · Equal amounts of substances W, X, Y and Z are reacted separately with equal amounts of… 0654/11 Oct/Nov 2022
18 Equal amounts of substances W, X, Y and Z are reacted separately with equal amounts of dilute acid. The following temperature changes are recorded. substance temperature change / C W increases by 8 X decreases by 6 Y increases by 9 Z decreases by 4 Which substances produce the most exothermic and the least endothermic reactions? most least exothermic endothermic A W X B W Z C X Y D Y Z
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2022
Q77 · The temperature change as the result of a chemical reaction may go up or down 0654/12 Oct/Nov 2022
18 The temperature change as the result of a chemical reaction may go up or down. temperature type of reaction 1 decreases endothermic 2 increases endothermic 3 increases exothermic 4 decreases exothermic Which rows about reactions are correct? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
1 marks
Answer: A
This question in 0654/12 Oct/Nov 2022
Q78 · A metal oxide powder is added to a dilute acid 0654/13 Oct/Nov 2022
18 A metal oxide powder is added to a dilute acid. The initial temperature of the acid is 21 C. The pH of the acid is 2. When all the acid has reacted, the temperature of the reaction mixture is 23 C and the pH is 7. Which statement describes this reaction? A It is endothermic and neutralisation. B It is endothermic and oxidation. C It is exothermic and neutralisation D It is exothermic and oxidation.
1 marks
Answer: C
This question in 0654/13 Oct/Nov 2022
Q79 · The initial and final temperatures in two experiments, X and Y, are shown 0654/12 Feb/March 2023
18 The initial and final temperatures in two experiments, X and Y, are shown. 30 40 30 30 25 35 25 25 20 30 20 20 initial temperature final temperature initial temperature final temperature experiment X experiment Y Which row shows the types of change that take place in these two experiments? experiment X experiment Y A endothermic endothermic B endothermic exothermic C exothermic endothermic D exothermic exothermic
1 marks
Answer: C
This question in 0654/12 Feb/March 2023
Q80 · Which statement about exothermic and endothermic reactions is correct? 0654/11 May/June 2023
19 Which statement about exothermic and endothermic reactions is correct? A An endothermic reaction involves heat energy being taken in by the reactants. B An exothermic reaction involves heat energy being taken in by the products. C In an endothermic reaction, the temperature of the reaction mixture increases. D In an exothermic reaction, the temperature of the reaction mixture decreases.
1 marks
Answer: A
This question in 0654/11 May/June 2023
Q81 · Potassium chloride is added to water 0654/12 May/June 2023
19 Potassium chloride is added to water. The temperature of the solution decreases as the potassium chloride dissolves. Which type of reaction occurs? A endothermic B exothermic C oxidation D reduction
1 marks
Answer: A
This question in 0654/12 May/June 2023
Q82 · Potassium chloride is added to water 0654/13 May/June 2023
19 Potassium chloride is added to water. The temperature of the solution decreases as the potassium chloride dissolves. Which type of reaction occurs? A endothermic B exothermic C oxidation D reduction
1 marks
Answer: A
This question in 0654/13 May/June 2023
Q83 · In a test-tube, magnesium reacts with dilute hydrochloric acid to form a salt and hydrogen 0654/12 Feb/March 2024
19 In a test-tube, magnesium reacts with dilute hydrochloric acid to form a salt and hydrogen. The reaction makes the test-tube warm. Which statement about the reaction explains this observation? A It is a combustion reaction. B It is a neutralisation reaction. C It is endothermic. D It is exothermic.
1 marks
Answer: D
This question in 0654/12 Feb/March 2024
Q84 · When aqueous sodium hydroxide reacts with dilute hydrochloric acid, the temperature of… 0654/11 May/June 2024
19 When aqueous sodium hydroxide reacts with dilute hydrochloric acid, the temperature of the reaction mixture increases. Ice cubes take in energy when they melt. Which row is correct? sodium hydroxide + melting ice cubes hydrochloric acid A endothermic exothermic B exothermic endothermic C endothermic endothermic D exothermic exothermic
1 marks
Answer: B
This question in 0654/11 May/June 2024
Q85 · Four different substances are added to the same acid of the same concentration in… 0654/11 Oct/Nov 2024
19 Four different substances are added to the same acid of the same concentration in reactions W, X, Y and Z. The initial temperature of the acid before each reaction is 21 C. The final temperatures of the mixtures are measured. The results are shown. reaction W X Y Z final temperature / C 28 19 26 17 Which row is correct? most most endothermic exothermic reaction reaction A W Z B Z W C X Y D Y X
1 marks
Answer: B
This question in 0654/11 Oct/Nov 2024
Q86 · Some observations about two reactions are shown 0654/12 Oct/Nov 2024
18 Some observations about two reactions are shown. In reaction 1, heat is taken in from the surroundings. In reaction 2, heat is released to the surroundings. Which row describes each reaction? reaction 1 reaction 2 A endothermic endothermic B endothermic exothermic C exothermic exothermic D exothermic endothermic
1 marks
Answer: B
This question in 0654/12 Oct/Nov 2024
Q87 · Some observations about two reactions are shown 0654/13 Oct/Nov 2024
18 Some observations about two reactions are shown. In reaction 1, heat is taken in from the surroundings. In reaction 2, heat is released to the surroundings. Which row describes each reaction? reaction 1 reaction 2 A endothermic endothermic B endothermic exothermic C exothermic exothermic D exothermic endothermic
1 marks
Answer: B
This question in 0654/13 Oct/Nov 2024
Q88 · The initial and final temperatures of four different experiments are measured 0654/12 Feb/March 2025
20 The initial and final temperatures of four different experiments are measured. Which experiment is the most endothermic? initial final temperature / °C temperature / °C A 20 19 B 20 27 C 21 26 D 22 20
1 marks
Answer: D
This question in 0654/12 Feb/March 2025
Q89 · Equal masses of four substances are added separately to different samples of 10 cm3 of… 0654/11 May/June 2025
20 Equal masses of four substances are added separately to different samples of 10 cm3 of dilute hydrochloric acid at 22 °C. The final temperature of each reaction mixture is measured. Which reaction is most endothermic? final temperature / °C A 29 B 27 C 20 D 17
1 marks
Answer: D
This question in 0654/11 May/June 2025
Q90 · Which statements about endothermic reactions are correct? 0654/12 May/June 2025
17 Which statements about endothermic reactions are correct? 1 Thermal energy is taken in from the surroundings. 2 Thermal energy is released to the surroundings. 3 The temperature of the reaction mixture decreases. 4 The temperature of the reaction mixture increases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
1 marks
Answer: A
This question in 0654/12 May/June 2025
Q91 · Which statements about endothermic reactions are correct? 0654/13 May/June 2025
17 Which statements about endothermic reactions are correct? 1 Thermal energy is taken in from the surroundings. 2 Thermal energy is released to the surroundings. 3 The temperature of the reaction mixture decreases. 4 The temperature of the reaction mixture increases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
1 marks
Answer: A
This question in 0654/13 May/June 2025
Q92 · Magnesium ribbon is added to dilute hydrochloric acid 0654/11 Oct/Nov 2025
20 Magnesium ribbon is added to dilute hydrochloric acid. Which observation shows that this process is exothermic? A The pH of the solution decreases. B The pH of the solution increases. C The temperature of the solution decreases. D The temperature of the solution increases.
1 marks
Answer: D
This question in 0654/11 Oct/Nov 2025
Q93 · Which row describes an endothermic reaction? 0654/12 Oct/Nov 2025
18 Which row describes an endothermic reaction?
thermal energy is the temperature of
transferred to the the reaction mixture
surroundings decreases
1 marks
Answer: C
This question in 0654/12 Oct/Nov 2025
Q94 · Which row describes an endothermic reaction? 0654/13 Oct/Nov 2025
18 Which row describes an endothermic reaction?
thermal energy is the temperature of
transferred to the the reaction mixture
surroundings decreases
1 marks
Answer: C
This question in 0654/13 Oct/Nov 2025
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