AQA GCSE Combined Science Chemistry - Paper 2 Already Graded A+
1. What is the rate of a chemical reaction?
Answer: The rate of a chemical reaction is the speed at which reactants are converted into products.
2. What are some examples of chemical reactions with different rates?
Answer: Exam...
AQA GCSE Combined Science Chemistry - Paper 2 Already Graded A+
1. What is the rate of a chemical reaction?
Answer: The rate of a chemical reaction is the speed at which reactants are converted into products.
2. What are some examples of chemical reactions with different rates?
Answer: Examples of chemical reactions with different rates include rusting of iron (slowest), chemical
weathering like acid rain damage (slow), metal magnesium reacting with acid to produce steam bubbles
(moderate), burning (fast), and explosions (fastest).
3. How can you measure the speed of a reaction?
Answer: You can measure the speed of a reaction by recording the amount of product formed or the
amount of reactant used up over time.
4. What do rate of reaction graphs show?
Answer: Rate of reaction graphs show how the amount of product formed or reactant used up changes
over time, and how this changes with different conditions such as temperature, concentration, and
surface area.
5. What do steep and shallow lines on a rate of reaction graph indicate?
Answer: Steep lines on a rate of reaction graph indicate a faster rate of reaction, while shallow lines
indicate a slower rate.
6. What does a flat line on a rate of reaction graph indicate?
Answer: A flat line on a rate of reaction graph indicates that the reaction has finished.
, 7. What do higher lines on a rate of reaction graph indicate?
Answer: Higher lines on a rate of reaction graph indicate more reactants and products.
8. What is collision theory in relation to rate of reaction?
Answer: Collision theory states that the frequency and energy of collisions between reacting particles
affect the rate of reaction.
9. What is activation energy in relation to rate of reaction?
Answer: Activation energy is the minimum amount of energy needed for reactants to break bonds and
start a reaction.
10. What are some factors that affect the rate of reaction?
Answer: Factors that affect the rate of reaction include temperature, concentration, pressure, and
surface area.
11. What is a catalyst in relation to rate of reaction?
Answer: A catalyst is a substance that speeds up the rate of reaction without being used up itself.
12. How do catalysts increase the rate of reaction?
Answer: Catalysts increase the rate of reaction by providing an alternative pathway with lower
activation energy, allowing reactants to convert into products more easily.
13. How is the rate of reaction measured in precipitation and colour change reactions?
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