Exploring Chemical Reactions
Science
Year 8
12 questions
~24 mins
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About This Worksheet
A worksheet covering Chemical Reactions for Year 8 students.
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Exploring Chemical Reactions
Subject: ScienceGrade: Year 8
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Untitled Worksheet
Grade Year 8
A
Questions
Answer all questions. Show your working where appropriate.
1.
What is a chemical reaction?
[2 marks]2.
Which of the following is an example of a chemical reaction?
[1 mark]AMelting of ice
BBoiling of water
CRusting of iron
DBreaking of glass
3.
True or False: In a chemical reaction, atoms are created or destroyed.
[1 mark]4.
Describe the role of a catalyst in a chemical reaction.
[2 marks]5.
What is the product formed when hydrogen reacts with oxygen?
[1 mark]ACarbon dioxide
BWater
CMethane
DAmmonia
6.
Fill in the blank: A ________ is a substance that speeds up a chemical reaction without being consumed.
[1 mark]7.
Explain the law of conservation of mass in your own words.
[3 marks]8.
Match the following terms to their definitions:
[3 marks]1. Exothermic Reaction
2. Endothermic Reaction
3. Reactants
ASubstances that start a chemical reaction
BA reaction that releases energy in the form of heat
CA reaction that absorbs energy from its surroundings
9.
Order the steps of balancing a chemical equation:
[2 marks]1
2
3
4
5
10.
Calculate the mass of water produced when 2 grams of hydrogen gas reacts with oxygen gas. Use the formula: 2H2 + O2 -> 2H2O. (H = 1 g/mol, O = 16 g/mol)
[3 marks]11.
True or False: An endothermic reaction releases heat.
[1 mark]12.
Discuss the importance of chemical reactions in daily life. Provide examples.
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Details
- Created
- 12/30/2025
- Updated
- 12/30/2025
- Type
- worksheet