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Rates of reaction

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-5 · England: KS4 Combined Science: The rate and extent of chemical change

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Question 1
A reaction produces 40 cm³ of gas in 40 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s
2
Question 2
Rates of reaction: which statement is NOT true?
- A. Food lasts longer in a fridge because reactions are slower at low temperature.
- B. Lower temperatures make reactions faster.
- C. Reactions need particles to collide with enough energy.
- D. Increasing surface area increases the rate.
3
Question 3
Why does powdered marble react faster with acid than marble chips?
- A. Powder has a larger surface area, so there are more collisions
- B. Powder has more mass
- C. Powder is a different substance
- D. Chips are hotter
Question 4
A reaction produces 25 cm³ of gas in 10 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s
5
Question 5
Rates of reaction: which statement is NOT true?
- A. Food lasts longer in a fridge because reactions are slower at low temperature.
- B. Increasing surface area increases the rate.
- C. A catalyst is not used up in a reaction.
- D. Lower temperatures make reactions faster.
6
Question 6
Why does powdered marble react faster with acid than marble chips?
- A. Chips are hotter
- B. Powder is a different substance
- C. Powder has a larger surface area, so there are more collisions
- D. Powder has more mass
Question 7
A reaction produces 50 cm³ of gas in 50 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s
8
Question 8
Rates of reaction: which statement is NOT true?
- A. A catalyst is not used up in a reaction.
- B. Every collision between particles causes a reaction.
- C. Increasing surface area increases the rate.
- D. Reactions need particles to collide with enough energy.
9
Question 9
What does a catalyst do?
- A. is used up in the reaction
- B. slows down a reaction
- C. speeds up a reaction without being used up
- D. changes the products
Question 10
A reaction produces 60 cm³ of gas in 60 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s
11
Question 11
Rates of reaction: which statement is NOT true?
- A. Lower temperatures make reactions faster.
- B. Food lasts longer in a fridge because reactions are slower at low temperature.
- C. A catalyst is not used up in a reaction.
- D. Reactions need particles to collide with enough energy.
12
Question 12
What does a catalyst do?
- A. slows down a reaction
- B. speeds up a reaction without being used up
- C. changes the products
- D. is used up in the reaction
Question 13
A reaction produces 30 cm³ of gas in 60 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s
14
Question 14
Rates of reaction: which statement is NOT true?
- A. Lower temperatures make reactions faster.
- B. Increasing surface area increases the rate.
- C. Reactions need particles to collide with enough energy.
- D. Food lasts longer in a fridge because reactions are slower at low temperature.
15
Question 15
What does a catalyst do?
- A. slows down a reaction
- B. is used up in the reaction
- C. speeds up a reaction without being used up
- D. changes the products
Question 16
A reaction produces 120 cm³ of gas in 60 seconds. What is the mean rate of reaction, in cm³/s?
Answercm³/s

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Answer key: Rates of reaction

1. 1 cm³/s
2. B. Lower temperatures make reactions faster.
3. A. Powder has a larger surface area, so there are more collisions
4. 2.5 cm³/s
5. D. Lower temperatures make reactions faster.
6. C. Powder has a larger surface area, so there are more collisions
7. 1 cm³/s
8. B. Every collision between particles causes a reaction.
9. C. speeds up a reaction without being used up
10. 1 cm³/s
11. A. Lower temperatures make reactions faster.
12. B. speeds up a reaction without being used up
13. 0.5 cm³/s
14. A. Lower temperatures make reactions faster.
15. C. speeds up a reaction without being used up
16. 2 cm³/s