SECTIONA: MULTIPLECHOICEQUESTIONS
[60]
• There are 20 multiple choice questions in this section. Each question carries 3 marks. Answer
ALLquestions by selecting the letter of the correct answer.
• Choose the best possible answer for each question, even if you think there is another
possible answer that is not given.
1. Consider the exothermic combustion of coal. Which of the following could increase the rate
of reaction?
A. using smaller pieces of coal
B. increasing the concentration of oxygen
C. lowering the temperature
D. both (a) and (b) are correct
E. choices (a), (b) and (c) are all correct
2. Which of the following is/are expected to affect the rate of a chemical reaction?
A. Decreasing the reactant concentrations.
B. Increasing the available surface area of a reactant
C. Shaking a well mixed reaction solution.
D. A and B
E. C and A
3. For a certain overall third-order reaction with the general form aA products, the initial
rate of reaction is 0.50 M·s-1 when the initial concentration of the reactant is 0.32 M. What
is the rate constant for this reaction?
A. 0.02 M- 2,s-1
B. 15 M- 2-s-1
C. a.soM- 2-s-1
D. 0.20 M- 2,s-1
E. 47 M- 2-s-1
4. When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter, the
temperature rises from 25.18 °C to 47.53 °C. What is the enthalpy change per gram of KOH
dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g·K
A. -116 J/g
B. -934J/g
C. -1.03 X 103 J/g
D. -2.19 X 103 J/g
E. -1.03 X 104 J/g
Page 2 of 10