Grade 7 Chemistry Worksheet: Chemical Reactions
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A medium difficulty Science worksheet on chemical_reactions for grade 7 students. Includes questions on Understanding Chemical Reactions.
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Grade 7 Chemistry Worksheet: Chemical Reactions
Subject: GeneralGrade: General
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Grade 7 Chemistry Worksheet: Chemical Reactions
Instructions: Answer the questions below about chemical reactions. Read each question carefully and choose or write the correct answer. Use complete sentences where required.
A
Understanding Chemical Reactions
1.
What is the process called when substances change into new substances with different properties?
[1 mark]APhysical change
BChemical reaction
CMixture formation
DEvaporation
2.
Describe what happens at the molecular level during a chemical reaction.
[2 marks]3.
Fill in the blank: In a chemical reaction, the starting substances are called _____ and the new substances formed are called products.
[1 mark]4.
True or False: Chemical reactions can be reversed by physical means like boiling or freezing.
[1 mark]5.
Match the following types of chemical reactions with their descriptions:
[3 marks]1. Synthesis
2. Decomposition
3. Combustion
AA substance burns in oxygen producing heat and light
BA compound breaks down into simpler substances
CTwo or more substances combine to form a new compound
6.
Which of the following is an example of a chemical reaction?
[1 mark]ABurning paper
BMelting ice
CBoiling water
DFreezing juice
7.
Explain why burning wood is considered a chemical reaction.
[2 marks]8.
Fill in the blank: During a chemical reaction, energy is often released in the form of _____ or heat.
[1 mark]9.
True or False: The law of conservation of mass states that mass is lost during a chemical reaction.
[1 mark]10.
Match the reactants to their typical products in a combustion reaction:
[3 marks]1. Hydrocarbon + Oxygen
2. Metal + Oxygen
3. Sodium + Chlorine
ASodium chloride
BMetal oxide
CCarbon dioxide + Water
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- Created
- 12/27/2025
- Updated
- 12/29/2025
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