Energetics of a reaction — Paper 1 · IGCSE Physical Science 0652

6 The diagrams show the changes that occur in an experiment on some pink crystals. test-tube water water pink crystals 1 2 blue crystals blue crystals warm pink crystals heat Which changes are exothermic? A 1 only B 2 only C both 1 and 2 D neither 1 nor 2

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2005

6 The production of energy is important. Fuel …1…, burns in an …2… reaction. What could 1 and 2 be? 1 2 A hydrogen endothermic B hydrogen exothermic C oxygen endothermic D oxygen exothermic

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2007

8 The diagram shows an experiment in which magnesium powder is added to dilute sulphuric acid. ig Powaer , MgSO, dilute (aq) H»SO, before after Which statement correctly compares the pH and temperature of the final solution with the values of the original acid? final solution has higher pH higher temperature v v 0 0O WwW > v x x v x x

1 marks

Answer: A

This question in 0652/11 Oct/Nov 2007

7 The diagram shows an experiment. magnesium oxide powder dilute hydrochloric acid The temperature of the resulting solution is higher than that of the acid. Which terms describe the reaction? A endothermic and neutralisation B endothermic and oxidation C exothermic and neutralisation D exothermic and oxidation

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2008

5 The temperature of two solutions is measured before, during and after they react with each other. The graph shows the results. temperature °9 time Which terms must apply to this reaction? endothermic neutralisation A v v B v x Cc x v D x x

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2010

5 Which statement about exothermic reactions is correct? A Energy is always absorbed during the reaction. B Energy is always released during the reaction. C Only the breaking of chemical bonds occurs in the reaction. D The temperature of the surroundings drops during the reaction.

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2014

5 Which statement about exothermic reactions is correct? A Energy is always absorbed during the reaction. B Energy is always released during the reaction. C Only the breaking of chemical bonds occurs in the reaction. D The temperature of the surroundings drops during the reaction.

1 marks

Answer: B

This question in 0652/12 Oct/Nov 2014

8 Which statement about all exothermic reactions is correct? A They absorb heat energy. B They produce flames. C They release heat energy. D They require oxygen gas.

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2016

1 In which process is heat energy neither given out nor taken in? Sun C water vapour di f fusin g cloud B water evaporating A ice melting D water vapour iceberg condensing sea water

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2016

8 Which statement about all exothermic reactions is correct? A They absorb heat energy. B They produce flames. C They release heat energy. D They require oxygen gas.

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2016

16 Hydrated copper(II) sulfate is heated. Which type of reaction takes place and what is the colour of the product? type of reaction colour of product A irreversible blue B irreversible white C reversible blue D reversible white

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2016

6 The diagram shows wood burning in air. Which two words describe what happens to the wood and the type of reaction taking place? wood is type of reaction A oxidised endothermic B oxidised exothermic C reduced endothermic D reduced exothermic

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2017

6 The diagram shows wood burning in air. Which two words describe what happens to the wood and the type of reaction taking place? wood is type of reaction A oxidised endothermic B oxidised exothermic C reduced endothermic D reduced exothermic

1 marks

Answer: B

This question in 0652/12 Oct/Nov 2017

6 Hydrochloric acid is added to aqueous sodium hydroxide. The temperature change of the sodium hydroxide solution before and after mixing is measured and shows that thermal energy is given out. Which row describes the type of reaction and the temperature change of the solution for this reaction? temperature type of reaction change A endothermic decrease B endothermic increase C exothermic decrease D exothermic increase

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2019

9 Which reactions are exothermic? 1 reaction of natural gas with oxygen 2 reaction of coal with oxygen 3 reaction of hydrogen with oxygen A 1 only B 1 and 2 only C 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2021

7 Anhydrous copper(II) sulfate is placed in a test-tube. When water is added to the test-tube, the temperature changes from 17 °C to 27 °C. Which type of reaction takes place? A addition B endothermic C exothermic D oxidation

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2022