Rate equations, orders and rate constants Quiz
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5 questions, one answer each
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1. A reaction has rate = k[A]²[B]. The concentration of A is doubled and that of B is tripled. By what factor does the rate change?
- A. 5
- B. 6
- C. 12
- D. 36
2. What are the units of k for a reaction that is second order overall?
- A. dm³ mol⁻¹ s⁻¹
- B. mol dm⁻³ s⁻¹
- C. s⁻¹
- D. dm⁶ mol⁻² s⁻¹
3. Doubling the concentration of reactant X has no effect on the rate. What is the order with respect to X?
- A. First
- B. Second
- C. Third
- D. Zero
4. A reaction has rate = k[A][B]² with k = 5.0 × 10² dm⁶ mol⁻² s⁻¹. What is the rate when [A] = 0.10 mol dm⁻³ and [B] = 0.20 mol dm⁻³?
- A. 10 mol dm⁻³ s⁻¹
- B. 2.0 mol dm⁻³ s⁻¹
- C. 0.20 mol dm⁻³ s⁻¹
- D. 2.0 × 10³ mol dm⁻³ s⁻¹
5. Which statement about the rate constant k is correct?
- A. It increases as the concentration of a reactant increases
- B. It is the same for all reactions at one temperature
- C. It increases when the temperature increases
- D. It decreases as the reaction proceeds