GCE O-Level · Science (Physics, Chemistry) (5086)

Chemical Energetics: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Chemical Energetics.

6 questions7 marksFree, no account

Question 1

1 mark

Which of the following processes represents an endothermic change?

Question 2

1 mark

When solid ammonium chloride is dissolved in water, the temperature of the solution decreases from \(24.0^{\circ}\text{C}\) to \(18.5^{\circ}\text{C}\).

Which statement correctly describes this process?

Question 3

1 mark

When a piece of magnesium metal is added to dilute hydrochloric acid, hydrogen gas is evolved and the temperature of the reaction mixture rises from \(21.0^{\circ}\text{C}\) to \(34.5^{\circ}\text{C}\).

What type of reaction is this, and what is the direction of heat energy transfer?

Question 4

1 mark

During a chemical reaction, the temperature of the surroundings increases. Which of the following statements about this reaction is correct?

Question 5

1 mark

Which of the following chemical or physical processes is classified as exothermic?

Question 6

2 marks

Which of the following processes is classified as an endothermic change?

A) Dissolving ammonium nitrate in water
B) Burning fossil fuels
C) Neutralisation of an acid by an alkali
D) Reaction of sodium with water

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