AQA GCSE Chemistry 4.6 - Rate and Extent of Chemical Change
1. How is the rate of a chemical reaction measured in terms of reactants?
Answer: The rate of a chemical reaction can be measured by tracking how quickly the reactants are used
up.
2. What is the relationship between the rate of a ...
AQA GCSE Chemistry 4.6 - Rate and Extent of Chemical Change
1. How is the rate of a chemical reaction measured in terms of reactants?
Answer: The rate of a chemical reaction can be measured by tracking how quickly the reactants are used
up.
2. What is the relationship between the rate of a chemical reaction and products?
Answer: The rate of a chemical reaction is also reflected in how quickly the products are formed.
3. What is the formula for calculating the mean rate of reaction in terms of reactants?
Answer: The formula is quantity of reactant used per unit time, typically expressed in units such as
grams per second (g/s) or cubic centimeters per second (cm³/s).
4. How can you calculate the mean rate of reaction in terms of products?
Answer: The formula is quantity of product formed per unit time, also expressed in units such as g/s or
cm³/s.
5. What are common units for measuring the quantity of reactants or products?
Answer: The most common units are grams (g) or cubic centimeters (cm³).
6. What are the two possible units for expressing the rate of reaction?
Answer: The two possible units are grams per second (g/s) and cubic centimeters per second (cm³/s).
7. How can you determine the rate of reaction from a graph?
, Answer: By drawing a tangent to the curve and calculating its gradient, which represents the rate at
which reactants are converted to products.
8. What is collision theory, and how does it relate to chemical reactions?
Answer: Collision theory proposes that chemical reactions occur only when particles collide with
sufficient energy, allowing them to overcome activation energy barriers.
9. What factors can influence the rate of a chemical reaction?
Answer: Factors that can affect the rate of a reaction include temperature, surface area of solid
reactants, concentration of reactants in solution, and pressure of gases.
10. What effect does increasing the surface area have on the rate of reaction?
Answer: Increasing the surface area typically increases the rate of reaction, as more particles are
available to collide and react.
11. Why does increasing the surface area increase the rate of reaction?
Answer: With more particles available, there are more frequent collisions between reactants, leading to
a faster rate of reaction.
12. What effect does increasing concentration have on the rate of reaction?
Answer: Increasing concentration typically increases the rate of reaction, as there are more particles
available for collisions.
Explain why increasing the concentration increases the rate of reaction ✅More concentrated means
more particles in solution, therefore more frequent collisions between reactants.
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