Investigating Rate of Reactions Quiz
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5 questions, one answer each
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1. What does the required practical for rates of reaction investigate?
- A. The colour change of an indicator only
- B. How a factor such as temperature or concentration affects rate of reaction
- C. The melting point of a solid reactant
- D. The pH of a neutral solution
2. Which method is best suited to a reaction that produces a gas?
- A. The disappearing cross method
- B. Measuring mass loss or gas volume over time
- C. Measuring pH change only
- D. Flame testing
3. What does the 'disappearing cross' method measure?
- A. The time for a cross mark to become obscured by a forming precipitate
- B. The volume of gas produced
- C. The mass of the flask over time
- D. The pH of the solution
4. Why is it important to keep all variables except the one being tested constant?
- A. To make the experiment take longer
- B. To ensure the investigation is a fair test
- C. To use less equipment
- D. To avoid needing a stopwatch
5. A student investigating the effect of concentration on rate using the disappearing cross method gets one very fast time that doesn't fit the pattern of their other results. What should they do?
- A. Ignore it and continue as normal
- B. Immediately conclude concentration has no effect on rate
- C. Treat it as a possible anomalous result, check for errors, and repeat that reading
- D. Use it as the only result in their conclusion