Exothermic and Endothermic Reactions Practice Questions

Question 1

Q1. Knowledge Recall (1 mark)

Define "exothermic reaction."

Question 2

Q2. Knowledge Recall (2 marks)

Give an example of an exothermic reaction that occurs in everyday life.

Question 3

Q3. Application (3 marks)

Explain why freezing water is an endothermic reaction.

Question 4

Q4. Calculation (3 marks)

Calculate the enthalpy change for this reaction:

2Zn(s) + O2(g) → 2ZnO(s)

ΔH = -368 kJ/mol

Question 5

Q5. Knowledge Recall (2 marks)

Name the type of bond that forms during an exothermic reaction.

Question 6

Q6. Application (2 marks)

Describe how you could use touch to distinguish between an exothermic and an endothermic reaction.

Question 7

Q7. Data Analysis (3 marks)

The following temperature-time graph shows an exothermic reaction. Explain the changes occurring during the reaction and identify the activation energy.

[Image of a temperature-time graph showing an exothermic reaction]

Question 8

Q8. Calculation (4 marks)

Balance this chemical equation:

Fe + HCl → FeCl3 + H2

Question 9

Q9. Application (3 marks)

Explain why adding sodium hydroxide solution to copper sulfate solution is an exothermic reaction.

Question 10

Q10. Application (3 marks)

Suggest two ways in which exothermic reactions can be used in everyday life.

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