Collision Theory & Activation Energy Quiz
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5 questions, one answer each
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1. According to collision theory, what must happen for a chemical reaction to occur?
- A. Particles must simply be present in the same container
- B. Particles must collide with sufficient energy
- C. Particles must be heated to boiling point
- D. Particles must be in the solid state
2. What is activation energy?
- A. The total energy released by a reaction
- B. The minimum energy particles need to react on collision
- C. The energy needed to melt a solid reactant
- D. The energy of the products only
3. What is a 'successful collision'?
- A. Any collision between two particles
- B. A collision where particles have enough energy to react
- C. A collision that produces heat
- D. A collision between identical particles only
4. Two particles collide but no reaction occurs. What is the most likely reason?
- A. The particles were the wrong colour
- B. The collision did not have enough energy to overcome the activation energy
- C. The particles were too close together
- D. The reaction was exothermic
5. A chemist increases both the frequency of collisions and the proportion of particles with energy above the activation energy in a reaction mixture. What effect will this have on the rate of reaction?
- A. No effect, since only frequency matters
- B. It will decrease the rate of reaction
- C. It will increase the rate of reaction, since more successful collisions occur per second
- D. It will only affect the products formed, not the rate