Law of Conservation of Mass Worksheet

Law of Conservation of Mass

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?

2. If 10 grams of hydrogen react completely with 80 grams of oxygen, how many grams of water will be produced?

1. The Law of Conservation of Mass applies to both open and closed systems.

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.

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?