Rate equations and orders of reaction Quiz
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5 questions, one answer each
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1. In an experiment with B constant, doubling the concentration of A makes the rate increase fourfold. What is the order with respect to A?
- A. Zero
- B. First
- C. Second
- D. Third
2. A reaction has rate = k[A][B]². What are the units of k?
- A. s⁻¹
- B. mol dm⁻³ s⁻¹
- C. dm³ mol⁻¹ s⁻¹
- D. dm⁶ mol⁻² s⁻¹
3. A first-order reaction has a half-life of 50 s. What fraction of the reactant remains after 150 s?
- A. 1/2
- B. 1/8
- C. 1/4
- D. 1/6
4. A rate–concentration graph for a reactant is a horizontal line. What is the order?
- A. Zero
- B. First
- C. Second
- D. Cannot be determined
5. The rate of a reaction is 4.0 × 10⁻⁵ mol dm⁻³ s⁻¹ when [A] = 0.020 mol dm⁻³ and the reaction is first order in A only. What is k?
- A. 8.0 × 10⁻⁷ s⁻¹
- B. 500 s⁻¹
- C. 2.0 × 10⁻³ s⁻¹
- D. 2.0 × 10⁻³ dm³ mol⁻¹ s⁻¹