Law of Conservation of Mass Worksheet
This worksheet covers the Law of Conservation of Mass, including its definition, application in chemical reactions, and problem-solving.
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Law of Conservation of Mass
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. Which of the following statements best describes the Law of Conservation of Mass?
Mass can be created or destroyed in a chemical reaction.
The total mass of reactants equals the total mass of products in a closed system.
Energy is always conserved, but mass is not.
Mass is only conserved in physical changes, not chemical changes.
2. If 10 grams of hydrogen react completely with 80 grams of oxygen, how many grams of water will be produced?
10 grams
70 grams
80 grams
90 grams
1. The Law of Conservation of Mass applies to both open and closed systems.
True
False
2. In a nuclear reaction, a small amount of mass can be converted into a large amount of energy, which violates the Law of Conservation of Mass.
True
False
1. The Law of Conservation of Mass states that mass is neither created nor in any ordinary chemical or physical change.
2. In a chemical reaction, the total mass of the must equal the total mass of the products.
3. Antoine Lavoisier is often credited with formulating the modern understanding of the Law of Conservation of Mass based on his experiments with .
1. Explain why balancing chemical equations is essential to upholding the Law of Conservation of Mass.
2. Describe an experiment that could demonstrate the Law of Conservation of Mass. Include the reactants, products, and expected observations.
Consider the following unbalanced chemical equation:
CH₄ + O₂ → CO₂ + H₂O
1. Balance the chemical equation above.
2. If you start with 16.0 g of CH₄ and 64.0 g of O₂, and 44.0 g of CO₂ are produced, how many grams of H₂O must be produced according to the Law of Conservation of Mass?