Chemical Equations Worksheet
A Grade 10 Science worksheet focusing on writing and balancing chemical equations, identifying reaction types, and understanding stoichiometry.
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Chemical Equations Worksheet
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. Which of the following represents a balanced chemical equation for the combustion of methane (CH₄)?
CH₄ + O₂ → CO₂ + H₂O
CH₄ + 2O₂ → CO₂ + 2H₂O
2CH₄ + 3O₂ → 2CO₂ + 2H₂O
CH₄ + O₂ → CO + H₂O
2. In the reaction 2Na + Cl₂ → 2NaCl, what type of reaction is this?
Decomposition
Single displacement
Synthesis
Double displacement
3. The law of conservation of mass states that matter cannot be created or in a chemical reaction.
4. In a chemical equation, the substances on the left side of the arrow are called , and the substances on the right side are called .
5. Balance the following chemical equation:
Fe₂O₃ + CO → Fe + CO₂
6. Balance the following chemical equation:
C₆H₁₂O₆ + O₂ → CO₂ + H₂O
7. Coefficients in a balanced chemical equation represent the number of atoms of each element.
True
False
8. An exothermic reaction releases heat into its surroundings.
True
False
9. Consider the following unbalanced reaction: Al + O₂ → Al₂O₃
a) Balance the equation.
b) What type of reaction is this?
c) If 4 moles of Aluminum react completely, how many moles of Aluminum Oxide (Al₂O₃) will be produced? Show your work.
10. The image above shows a thermite reaction, which is highly exothermic. Iron(III) oxide reacts with aluminum to produce molten iron and aluminum oxide. Write the balanced chemical equation for this reaction.