Factors that Affect the Rate of Reactions Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which of these is NOT one of the four main factors affecting rate of reaction covered in this topic?
- A. Temperature
- B. Concentration
- C. Colour of the reactants
- D. Surface area
2. Why does increasing temperature increase the rate of reaction?
- A. It only increases the frequency of collisions
- B. It only increases the energy of collisions
- C. It increases both the frequency of collisions and the proportion with enough energy to react
- D. It reduces the activation energy of the reaction
3. Why does crushing a solid reactant into powder increase reaction rate?
- A. It increases the surface area exposed, so collisions happen more often
- B. It lowers the activation energy of the reaction
- C. It increases the temperature of the solid
- D. It changes the products formed
4. A student doubles the concentration of hydrochloric acid used in a reaction with magnesium. What happens to the rate of reaction?
- A. It decreases, because there are more particles competing for space
- B. It stays the same, because concentration does not affect rate
- C. It increases, because more acid particles are present to collide with the magnesium
- D. It increases, because the activation energy is lowered
5. A gas-phase reaction is carried out first at 1 atmosphere and then at 4 atmospheres pressure, with temperature and concentration unchanged. What effect does the increase in pressure have, and why?
- A. No effect, since pressure only affects equilibrium position, not rate
- B. Rate increases, because gas particles are compressed into a smaller volume, increasing collision frequency
- C. Rate decreases, because particles have less energy at higher pressure
- D. Rate increases, because pressure lowers the activation energy