Reaction Profiles Practice Questions

Question 1

Q1 (2 marks)

Define the activation energy of a reaction.

Question 2

Q2 (3 marks)

Explain the effect of a catalyst on the reaction profile of a reaction.

Question 3

Q3 (4 marks)

The reaction profile for the exothermic reaction below is shown:

```

Reactants → Products

A B

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a) State the enthalpy change of the reaction.

b) Explain why the products have a lower energy than the reactants.

Question 4

Q4 (2 marks)

Define the concept of an endothermic reaction.

Question 5

Q5 (3 marks)

Calculate the activation energy of a reaction with a rate constant of 1.5 x 10^-3 mol dm^-3 s^-1 at 298 K and an activation energy of 20 kJ mol^-1.

Question 6

Q6 (2 marks)

Explain how temperature affects the rate of a chemical reaction.

Question 7

Q7 (3 marks)

The following reaction is endothermic:

```

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

```

a) Draw a reaction profile for this reaction.

b) State the effect of increasing temperature on the position and shape of the reaction profile.

Question 8

Q8 (2 marks)

Define the term 'rate-limiting step'.

Question 9

Q9 (3 marks)

Explain how a catalyst can affect the rate-limiting step of a reaction.

Question 10

Q10 (4 marks)

The following data was collected for the reaction:

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a) Write a rate equation for the reaction.

b) Determine the order of the reaction with respect to the reactant.

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