Conservation of Mass Worksheet
This worksheet covers the fundamental principle of conservation of mass, including its definition, application in chemical reactions, and problem-solving.
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Conservation of Mass Worksheet
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. The Law of Conservation of Mass states that mass is neither created nor during a chemical reaction.
2. In a closed system, the total mass of the must equal the total mass of the products.
3. Antoine Lavoisier is often credited with formally stating the Law of of Mass.
1. Which of the following best describes the Law of Conservation of Mass?
Mass is always conserved in open systems.
Mass can be created or destroyed under certain conditions.
The total mass of reactants equals the total mass of products.
Energy is converted into mass during a chemical reaction.
2. If 10 grams of hydrogen react completely with 80 grams of oxygen to form water, what is the mass of the water produced?
10 grams
80 grams
90 grams
70 grams
1. The Law of Conservation of Mass applies only to physical changes, not chemical changes.
True
False
2. In an open system, it may appear that mass is not conserved due to the escape or addition of gases.
True
False
1. Explain why balancing chemical equations is essential for demonstrating the Law of Conservation of Mass.
2. A student burns a piece of wood, and the mass of the ash is less than the original mass of the wood. Does this violate the Law of Conservation of Mass? Explain your reasoning.
1. In a chemical reaction, 25.0 g of calcium carbonate (CaCO₃) decomposes to produce 11.0 g of carbon dioxide (CO₂). How much calcium oxide (CaO) is produced?
2. Consider the reaction: 2Na + Cl₂ → 2NaCl. If you start with 46.0 g of sodium (Na) and 71.0 g of chlorine (Cl₂), what is the theoretical yield of sodium chloride (NaCl)?
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