AQA GCSE Chemistry C8 Already Rated A+
1. What is the concept of reaction rate, and why is it important?
Answer: Reaction rate refers to the speed at which reactants convert into products. This concept is
crucial in the chemical industry and our bodies, as it affects the efficiency and cost o...
AQA GCSE Chemistry C8 Already Rated A+
1. What is the concept of reaction rate, and why is it important?
Answer: Reaction rate refers to the speed at which reactants convert into products. This concept is
crucial in the chemical industry and our bodies, as it affects the efficiency and cost of producing
products.
2. How can you measure the rate of a chemical reaction?
Answer: You can measure the rate of a reaction by monitoring how quickly reactants are consumed and
products are formed.
3. What are the three methods for determining the rate of a reaction?
Answer: You can measure the decreasing mass of a reaction mixture, the increasing volume of gas
produced, or the decreasing light transmission through a solution.
4. How do you calculate the rate of reaction at a specific time point?
Answer: You can draw a tangent to the curve at that point, construct a right-angled triangle, and
calculate the gradient to determine the rate of reaction.
5. What is the mean rate of reaction, and how do you calculate it?
Answer: The mean rate of reaction is calculated by dividing the quantity of reactant used or product
formed by the time elapsed.
6. What are the four main factors that influence reaction rates?
Answer: Temperature, surface area of solids, concentration of solutions, and pressure of gases all affect
reaction rates.
, 7. What is collision theory, and what role does activation energy play in it?
Answer: Collision theory states that reacting particles must collide with sufficient energy to initiate a
reaction. Activation energy is the minimum energy required for particles to react.
8. How can you increase the likelihood of reactions between reactant particles?
Answer: You can increase the frequency of collisions or the energy possessed by particles during
collisions to facilitate reactions.
9. How do you compare solids with different surface areas quantitatively?
Answer: You can compare solids by examining their surface area to volume ratio.
10. Why do we cool food, and what happens when temperature increases?
Answer: We cool food to slow unwanted chemical reactions. When temperature increases, particles
collide more frequently and with greater energy, leading to an increased rate of reaction.
11. How does increasing concentration affect reaction rates?
Answer: Increasing concentration increases reaction rates because there are more particles present in a
given volume.
12. What happens when particles collide more frequently?
Answer: When particles collide more frequently, there are more opportunities for them to react, leading
to an increased rate of reaction.
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