Rates of reaction Quiz
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5 questions, one answer each
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1. On a graph of gas volume against time, which part shows the fastest rate?
- A. The flat part at the end
- B. The point where the line starts at zero
- C. The steepest part at the start
- D. The gentle slope in the middle
2. Which change would decrease the rate of reaction of magnesium with acid?
- A. Diluting the acid with water
- B. Warming the acid
- C. Using magnesium powder instead of ribbon
- D. Adding a catalyst
3. What is a catalyst?
- A. A substance that is used up to make products faster
- B. A substance that speeds up a reaction and is not used up
- C. A substance that slows down a reaction
- D. A substance that increases the mass of the product
4. 60 cm³ of gas is collected in 20 seconds. What is the mean rate of reaction?
- A. 80 cm³/s
- B. 1200 cm³/s
- C. 0.33 cm³/s
- D. 3 cm³/s
5. Why do marble chips crushed into powder react faster with acid?
- A. The particles move faster
- B. The particles have more energy
- C. More particles are exposed, so collisions are more frequent
- D. The acid is more concentrated