Rates of Reaction Quiz
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5 questions, one answer each
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1. What does collision theory state?
- A. Reactions occur whenever particles touch each other
- B. Reactions only occur when particles collide with sufficient energy
- C. Reactions occur only at high temperature
- D. Reactions require a catalyst to occur
2. Which factor increases rate by increasing BOTH the frequency and the energy of collisions?
- A. Concentration
- B. Surface area
- C. Temperature
- D. Pressure
3. How can the rate of reaction between marble chips and hydrochloric acid be measured?
- A. By timing colour change of the solution
- B. By measuring the volume of gas produced over time
- C. By weighing the marble chips before the reaction only
- D. By measuring the pH of the acid only
4. A graph of gas volume against time for a reaction shows a steep initial slope that gradually flattens to a horizontal line. What does this show?
- A. The reaction rate was constant throughout
- B. The reaction was fast at first then slowed as a reactant was used up, finishing when the line is flat
- C. The reaction never actually started
- D. The reaction was endothermic
5. A powdered solid reacts faster with an acid than the same mass of solid in large lumps. Which explanation is correct?
- A. Powdered solid has a lower activation energy
- B. Powdered solid has a greater surface area to volume ratio, so more particles are exposed for collisions to occur more frequently
- C. Powdered solid has a higher temperature than the lumps
- D. Powdered solid contains more moles of substance than the lumps