Balancing Chemical Equations Worksheet
A Grade 11 science worksheet focused on balancing chemical equations, understanding stoichiometry, and identifying types of reactions.
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Topics
Balancing Chemical Equations
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Read each question carefully and provide your answer in the space provided. For balancing equations, ensure the number of atoms for each element is equal on both sides of the equation.
1. The law of conservation of mass states that matter cannot be created or in a chemical reaction.
2. A is a number placed in front of a chemical formula in an equation to balance it.
3. In a balanced chemical equation, the total number of atoms of each element must be the same on both the reactant and sides.
4. Which of the following is true about a balanced chemical equation?
The number of molecules is conserved.
The total mass of reactants equals the total mass of products.
The physical states of reactants and products must be the same.
The coefficients always represent the number of grams.
5. What is the correct coefficient for O₂ when the following equation is balanced: C₃H₈ + O₂ → CO₂ + H₂O?
3
5
7
10
6. Balance the following chemical equation:
Fe₂O₃ + C → Fe + CO
7. Balance the following chemical equation:
Al + HCl → AlCl₃ + H₂
8. Balance the following chemical equation:
NH₃ + O₂ → NO + H₂O
9. A subscript in a chemical formula can be changed to balance an equation.
True
False
10. The coefficients in a balanced chemical equation represent the molar ratios of the reactants and products.
True
False
11. Explain why balancing chemical equations is crucial in chemistry, referencing the Law of Conservation of Mass.