AQA · Chemistry · 8462
GCSE Chemistry: Factors which affect the rates of chemical reactions
The rate and extent of chemical change · AQA GCSE Chemistry (8462), specification point 4.6.1.2. Cards are generated from the exam board's own specification for "Factors which affect the rates of chemical reactions", and every card links back to the page it came from. Specification © AQA — used with attribution.
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How does increasing the concentration of a reactant in solution affect the rate of reaction?
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It increases the rate — more particles per unit volume means more frequent collisions.
How does increasing the pressure of reacting gases affect the rate of reaction?
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It increases the rate — gas particles are closer together, so collisions are more frequent.
How does increasing the surface area of a solid reactant affect the rate of reaction?
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It increases the rate — more particles are exposed for collisions.
How does increasing the temperature affect the rate of a chemical reaction?
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It increases the rate — particles move faster and collide more often and more energetically.
What effect does adding a catalyst have on the rate of a reaction?
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It increases the rate of reaction (without being used up).
For reacting gases, the factor equivalent to concentration in solution is ?.
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pressure
Powdering a solid reactant speeds up a reaction because it increases the ?.
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surface area
Which factor affecting rate is investigated in AQA GCSE Chemistry required practical 5?
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Concentration of reactants.
Which two methods of measuring reaction rate are used in AQA required practical 5?
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Measuring the volume of gas produced, and observing a change in colour or turbidity.
What is measured over time in the turbidity method for reaction rate?
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How long it takes the solution to become cloudy (e.g. until a cross under the flask disappears).
What should a rates-of-reaction investigation (required practical 5) begin by developing?
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A hypothesis.
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