Determining rate equations experimentally Quiz
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5 questions, one answer each
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1. In an experiment, doubling the concentration of X leaves the rate unchanged. What is the order with respect to X?
- A. First
- B. Second
- C. Zero
- D. Cannot be known
2. The rate of a reaction increases by a factor of 9 when [Y] is tripled. What is the order with respect to Y?
- A. Two
- B. One
- C. Three
- D. Zero
3. A reaction is first order in A and second order in B. What are the units of k?
- A. s⁻¹
- B. dm³ mol⁻¹ s⁻¹
- C. mol dm⁻³ s⁻¹
- D. dm⁶ mol⁻² s⁻¹
4. A tangent to a concentration–time curve at t = 0 passes through (0 s, 0.60 mol dm⁻³) and (300 s, 0 mol dm⁻³). What is the initial rate?
- A. 2.0 × 10⁻³ mol dm⁻³ s⁻¹
- B. 5.0 × 10² mol dm⁻³ s⁻¹
- C. 0.60 mol dm⁻³ s⁻¹
- D. 1.8 × 10² mol dm⁻³ s⁻¹
5. Why is a water bath used when measuring a rate of reaction?
- A. To increase the rate
- B. To keep the temperature, and so k, constant
- C. To stop the reaction
- D. To remove the catalyst