Calculating Rates of Reactions Quiz
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5 questions, one answer each
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1. Which equation correctly calculates rate of reaction?
- A. Rate = time ÷ amount of product formed
- B. Rate = amount of product formed ÷ time
- C. Rate = amount of reactant used × time
- D. Rate = time × amount of reactant used
2. A reaction produces 24 cm³ of gas in 12 seconds. What is the mean rate of reaction?
- A. 0.5 cm³/s
- B. 2 cm³/s
- C. 12 cm³/s
- D. 36 cm³/s
3. On a graph of volume of gas produced against time, what does a steeper gradient represent?
- A. A slower reaction
- B. A faster reaction
- C. The reaction has stopped
- D. A larger total volume only
4. Why does a reaction-progress graph typically flatten out over time?
- A. The temperature increases
- B. Reactants are used up so the rate decreases until the reaction stops
- C. The product decomposes
- D. The catalyst is used up
5. A student wants to find the rate of reaction at exactly 20 seconds from a curved graph of product mass against time. What should they do?
- A. Divide the total mass by 20
- B. Draw a tangent to the curve at t = 20 s and find its gradient
- C. Draw a straight line from the origin to the last point
- D. Read the mass value at t = 20 s only