Grade 7 Chemistry Worksheet: Chemical Reactions (Hard Level)
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7 questions
~14 mins
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A hard difficulty Science worksheet on chemical_reactions for grade 7 students. Includes questions on Chemical Reactions and Stoichiometry.
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Grade 7 Chemistry Worksheet: Chemical Reactions (Hard Level)
Subject: GeneralGrade: General
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Grade 7 Chemistry Worksheet: Chemical Reactions (Hard Level)
Instructions: Answer all questions carefully. Read each question thoroughly and select or write the correct answer. Use scientific terminology where appropriate.
A
Chemical Reactions and Stoichiometry
1.
In a chemical reaction, what is the substance called that is produced and new in the reaction?
[1 mark]AReactant
BCatalyst
CProduct
DSolvent
2.
Balance the following chemical equation: _H₂ + _O₂ → _H₂O. What are the correct coefficients?
[2 marks]3.
During a chemical reaction, atoms are rearranged but neither created nor destroyed. This principle is known as the law of ____.
[2 marks]4.
Which of the following is an example of a synthesis reaction?
[1 mark]ACaCO₃ → CaO + CO₂
BZn + CuSO₄ → ZnSO₄ + Cu
CNaCl → Na + Cl
D2H₂ + O₂ → 2H₂O
5.
In the reaction: 2Na + Cl₂ → 2NaCl, how many molecules of sodium chloride are produced when 2 molecules of sodium react with excess chlorine?
[2 marks]6.
What is the main difference between a chemical change and a physical change?
[2 marks]7.
Describe what happens at the molecular level during a chemical reaction.
[2 marks]Quick Actions
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- Created
- 12/10/2025
- Updated
- 12/29/2025
- Type
- worksheet