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AQA GCSE Chemistry Paper 2 Verified Solutions 1. How can you measure the rate of a reaction? Answer: By measuring the quantity of reactant used or product formed over time 2. What is the formula for calculating the mean rate of reaction when measuring reactant quantity? Answer: Mean rate of...

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  • July 11, 2024
  • 26
  • 2023/2024
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AQA GCSE Chemistry Paper 2 Verified Solutions
1. How can you measure the rate of a reaction?



Answer: By measuring the quantity of reactant used or product formed over time



2. What is the formula for calculating the mean rate of reaction when measuring reactant quantity?



Answer: Mean rate of reaction = quantity of reactant used / time taken



3. What is the formula for calculating the mean rate of reaction when measuring product quantity?



Answer: Mean rate of reaction = quantity of product formed / time taken



4. In what units can you measure the rate of a reaction?



Answer: Grams per second (g/s), cubic centimeters per second (cm³/s), or moles per second (mol/s)



5. How do you calculate the rate of a reaction at a specific time from a graph?



Answer: By finding the gradient of a tangent drawn at that specific time on the graph



6. What are the five factors that can affect the rate of a chemical reaction?



Answer: Concentration of reactants, pressure of reacting gases, surface area of solid reactants,
temperature, and presence of catalysts



7. What theory explains how various factors influence the rate of a chemical reaction?



Answer: Collision theory

,8. What is collision theory in simple terms?



Answer: Chemical reactions occur only when particles collide with sufficient energy and frequency



9. What is activation energy, and what role does it play in collision theory?



Answer: It's the minimum energy required for particles to react; increasing activation energy slows
down reactions, while decreasing it speeds them up



10. How do increasing concentration, pressure, surface area, and temperature affect the rate of a
reaction according to collision theory?



Answer: Increasing these factors increases the frequency and energy of collisions, thus increasing the
rate of reaction



11. How can you increase the surface area of solid reactants?



Answer: By grinding them into smaller particles or powders



12. What happens to the rate of reaction when temperature increases by 10°C?



Answer: It doubles



13. What is a catalyst, and how does it work?



Answer: A chemical that changes the rate of a reaction without being consumed; it provides an
alternative pathway with lower activation energy



14. How can you identify whether a substance is a catalyst in a reaction?

, Answer: If it's not included in the chemical equation



15. What is a reversible reaction, and how can you change its direction?



Answer: A reaction where products can re-form reactants; direction can be changed by adjusting
conditions such as temperature or concentration

Describe the energy changes in a reversible reaction ✔️One direction will be exothermic and the other
direction endothermic



When is equilibrium in a reversible reaction achieved in apparatus which prevents the escape of
reactants and products? ✔️When the rate of the forward and reverse reactions occur at exactly the
same rate



What affects the relative amount of all the reactants and products at equilibrium in a reversible
reaction? ✔️The conditions



What happens to an equilibrium if any of the conditions change? ✔️The system responds to counteract
the change



What does Le Chatelier's principle predict? ✔️The effects of changing conditions on a system at
equilibrium



What affect will changing the concentration of one of the reactants in a reversible reaction have on the
equilibrium? ✔️The system will no longer be in equilibrium and the concentration of all the substances
will change until equilibrium is reached again



What happens when the concentration of a reactant is increased in a reversible reaction? ✔️More
products will be formed until equilibrium is reached again



What happens when the concentration of a product is decreased in a reversible reaction? ✔️More
reactant will react until equilibrium is reached again

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