Exploring the Rates of Reaction
Science
Year 8
15 questions
~30 mins
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A worksheet covering Rates of Reaction for Year 8 students.
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Exploring the Rates of Reaction
Subject: ScienceGrade: Year 8
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Untitled Worksheet
Grade Year 8
A
Questions
Answer all questions. Show your working where appropriate.
1.
Which of the following will increase the rate of reaction?
[1 mark]AIncreasing temperature
BDecreasing surface area
CDiluting the reactants
DRemoving a catalyst
2.
True or False: A catalyst is used up in a reaction.
[1 mark]3.
True or False: Increasing the concentration of reactants generally decreases the rate of reaction.
[1 mark]4.
Explain how temperature affects the rate of reaction.
[2 marks]5.
What is the role of a catalyst in a chemical reaction?
[2 marks]6.
Describe what is meant by 'rate of reaction'.
[1 mark]7.
Calculate the rate of reaction if 0.5 moles of a reactant are consumed in 2 minutes. Use the formula: Rate = Change in amount of substance / Time
[3 marks]8.
Match the following terms to their definitions:
[3 marks]1. Catalyst
2. Activation Energy
3. Concentration
AAmount of substance in a given volume
BSubstance that speeds up a chemical reaction without being consumed
CMinimum energy required for a reaction to occur
9.
Order the following steps in the reaction process: A) Activation energy is reached, B) Reactants collide, C) Products are formed.
[2 marks]1
2
3
4
5
10.
Fill in the blank: A substance that increases the rate of a chemical reaction without being consumed is called a _____.
[1 mark]11.
Discuss how surface area affects the rate of reaction, providing examples.
[6 marks]12.
Multiple choice: Which factor does not affect the rate of reaction?
[1 mark]ATemperature
BConcentration
CColor of reactants
DPresence of catalyst
13.
Multiple choice: What happens to the rate of reaction if the surface area of a solid is decreased?
[1 mark]AThe rate increases
BThe rate decreases
CThe rate remains unchanged
DThe rate becomes zero
14.
Explain why increasing the concentration of reactants increases the rate of reaction.
[2 marks]15.
Order the following factors in terms of their impact on increasing reaction rate: A) Temperature, B) Catalyst, C) Surface Area.
[2 marks]1
2
3
4
5
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- Created
- 12/30/2025
- Updated
- 12/30/2025
- Type
- worksheet