Chemistry Worksheet: Chemical Reactions for Grade 7
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5 questions
~10 mins
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A medium difficulty Science worksheet on chemical_reactions for grade 7 students. Includes questions on Chemical Reactions Basics, Signs of a Chemical Reaction, Types of Chemical Reactions.
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Chemistry Worksheet: Chemical Reactions for Grade 7
Subject: GeneralGrade: General
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Chemistry Worksheet: Chemical Reactions for Grade 7
Instructions: Answer the following questions about chemical reactions. Read each question carefully and choose or write your answer accordingly. Use complete sentences where required.
A
Chemical Reactions Basics
1.
What is a chemical reaction?
[2 marks]2.
Which of the following is an example of a chemical change?
[1 mark]ABurning wood
BMelting ice
CBoiling water
DDissolving sugar in tea
3.
Fill in the blank: In a chemical reaction, the starting substances are called _____, and the new substances formed are called _____.
[1 mark]4.
True or False: In a chemical reaction, the mass of the reactants equals the mass of the products.
[1 mark]5.
Match the following types of chemical reactions with their descriptions:
[3 marks]1. Synthesis
2. Decomposition
3. Replacement
AA compound breaks down into simpler substances
BTwo or more substances combine to form a new substance
CAn element replaces another in a compound
B
Signs of a Chemical Reaction
1.
Which of the following is NOT a typical sign that a chemical reaction is occurring?
[1 mark]AMelting of the substance
BColor change
CFormation of a gas
DFormation of a precipitate
2.
Fill in the blank: The formation of a _____ indicates a chemical reaction has taken place when two clear liquids produce a solid.
[1 mark]3.
True or False: The production of heat or light during a reaction is a sign that a chemical change has occurred.
[1 mark]4.
Explain briefly what a precipitate is.
[2 marks]C
Types of Chemical Reactions
1.
Which type of reaction involves two or more substances combining to form a new compound?
[1 mark]ADecomposition
BSingle replacement
CSynthesis
DCombustion
2.
Fill in the blank: The reaction in which a compound breaks down into simpler substances is called _____.
[1 mark]3.
True or False: Combustion is a chemical reaction where a substance reacts with oxygen to produce heat and light.
[1 mark]4.
Match the reaction types with their examples:
[3 marks]1. Single replacement
2. Double replacement
3. Combustion
AA metal replaces another metal in a compound
BTwo compounds exchange ions to form new compounds
CA substance burns in oxygen producing heat and light
D
Chemical Equations
1.
What is the purpose of a chemical equation?
[2 marks]2.
Fill in the blank: The substances on the left side of a chemical equation are called _____, and those on the right are called _____.
[1 mark]3.
True or False: The law of conservation of mass states that matter is created in a chemical reaction.
[1 mark]4.
In the reaction: 2H₂ + O₂ → 2H₂O, how many molecules of water are produced?
[2 marks]E
Factors Affecting Chemical Reactions
1.
Which of the following can increase the rate of a chemical reaction?
[1 mark]ALower temperature
BDecreased surface area
CAdding a catalyst
DRemoving energy
2.
Fill in the blank: Increasing the _____ of reactants usually speeds up a chemical reaction.
[1 mark]3.
True or False: Catalysts are substances that slow down chemical reactions.
[1 mark]4.
Explain how temperature affects the rate of a chemical reaction.
[2 marks]F
Real-World Chemical Reactions
1.
Which everyday activity involves a chemical reaction?
[1 mark]AMelting ice in the freezer
BBaking bread
CRipping paper
DBoiling water for tea
2.
Fill in the blank: Rusting of iron is a chemical reaction called _____.
[1 mark]3.
True or False: Burning fossil fuels releases energy and produces carbon dioxide and water.
[1 mark]4.
Describe what happens during the rusting of iron.
[2 marks]Quick Actions
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Details
- Created
- 10/7/2025
- Updated
- 12/29/2025
- Type
- worksheet