Conservation of Mass Worksheet
Explore the principle of conservation of mass with engaging questions and activities for 7th-grade science students.
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Conservation of Mass
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Read each question carefully and answer to the best of your ability. Remember the Law of Conservation of Mass!
1. What does the Law of Conservation of Mass state?
Mass can be created but not destroyed.
Mass can be destroyed but not created.
Mass is neither created nor destroyed in a chemical reaction.
Mass can change into energy.
2. If you burn a log, what happens to its mass?
The mass is lost.
The total mass of the ashes and smoke is less than the original log.
The total mass of the ashes, smoke, and gases equals the original log's mass.
The mass is converted directly into heat.
3. The Law of Conservation of Mass applies to both physical and changes.
4. In a closed system, the total mass of the before a reaction is equal to the total mass of the products after the reaction.
5. Antoine Lavoisier is often credited with discovering the Law of of Mass.
6. When ice melts into water, its mass decreases.
True
False
7. If a chemical reaction produces a gas, the mass of the gas should be included when calculating the total mass of the products.
True
False
8. Imagine you have 10 grams of baking soda and you mix it with 10 grams of vinegar. After the reaction, you observe fizzing and a new substance. If the total mass of the substances in the container after the reaction is 18 grams, what can you infer about the missing 2 grams?
9. Observe the diagram below showing states of matter transitions. Explain how the Law of Conservation of Mass applies to these changes.
