Collision theory and rates of reaction Quiz
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5 questions, one answer each
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1. Which change increases the proportion of collisions with energy at least equal to the activation energy?
- A. Increasing the concentration
- B. Increasing the pressure
- C. Increasing the temperature
- D. Crushing a solid reactant
2. A reaction takes 25 s to reach a fixed endpoint. What is the relative rate?
- A. 0.04 s⁻¹
- B. 0.4 s⁻¹
- C. 4 s⁻¹
- D. 25 s⁻¹
3. Why does crushing a solid increase the rate?
- A. It lowers the activation energy
- B. It increases the surface area, so collisions are more frequent
- C. It increases the temperature
- D. It increases the proportion of particles with enough energy
4. A tangent to a graph of volume (cm³) against time (s) passes through (10, 5) and (50, 25). What is the rate?
- A. 0.20 cm³ s⁻¹
- B. 2.0 cm³ s⁻¹
- C. 0.50 cm³ s⁻¹
- D. 5.0 cm³ s⁻¹
5. A student claims that raising the pressure of a gaseous reaction lowers the activation energy. This is wrong because:
- A. Pressure only changes the frequency of collisions
- B. Activation energy always falls with pressure
- C. Pressure increases the temperature
- D. The activation energy is the same as the rate