Expert Chemistry Tutoring

Q1. Knowledge Recall (1 mark)

Define the term 'activation energy'.

Q2. Knowledge Recall (2 marks)

State the three factors that affect the rate of a reaction according to Collision theory.

Q3. Application (2 marks)

Explain how increasing the temperature of a reaction affects the rate of reaction.

Q4. Application (3 marks)

A student investigates the reaction between hydrogen and chlorine gases. They find that the rate of reaction is affected by the pressure of the hydrogen gas. Explain this observation.

Q5. Calculations (3 marks)

Calculate the activation energy of a reaction if the rate constant doubles when the temperature is increased from 25 °C to 55 °C. (Assume the Boltzmann constant, k = 8.314 J/mol·K)

Q6. Knowledge Recall (2 marks)

What is the role of a catalyst in a chemical reaction?

Q7. Application (3 marks)

Explain how a catalyst can be used to reduce pollution from car exhausts.

Q8. Calculation (4 marks)

- The rate law for the reaction is determined to be: rate = k[A][B]^2

- An experiment is conducted at 25 °C with initial concentrations of [A] = 0.10 mol/L and [B] = 0.20 mol/L

- Calculate the initial rate of the reaction.

Q9. Application (3 marks)

Discuss the environmental implications of the Haber process, which uses Collision theory to produce ammonia for fertilizers.

Q10. Knowledge Recall (2 marks)

Explain why the rate of a reaction does NOT always increase with increasing temperature.