Rate equations and orders of reaction Quiz
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5 questions, one answer each
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1. A reaction has rate = k[A]²[B]. What happens to the rate when [A] is doubled and [B] is kept constant?
- A. It stays the same
- B. It doubles
- C. It increases by a factor of 3
- D. It increases by a factor of 4
2. What are the units of the rate constant for a first-order reaction?
- A. mol dm⁻³ s⁻¹
- B. dm³ mol⁻¹ s⁻¹
- C. s⁻¹
- D. dm⁶ mol⁻² s⁻¹
3. Which rate–concentration graph shows a first-order reactant?
- A. A horizontal line
- B. A straight line through the origin
- C. A curve that gets steeper as concentration increases
- D. A straight line with a negative gradient
4. The successive half-lives of a reactant are 30 s, 60 s and 120 s. What is the order with respect to the reactant?
- A. Zero
- B. First
- C. Third
- D. Second
5. In two experiments, [X] is trebled with all else constant and the initial rate increases by a factor of 9. What is the order with respect to X?
- A. 2
- B. 1
- C. 0
- D. 3