Law of Conservation of Mass Worksheet
Explore the Law of Conservation of Mass with this worksheet for Grade 7 Science students, covering definitions, examples, and calculations.
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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 your work for any calculations.
1. Which statement best describes the Law of Conservation of Mass?
Mass can be created or destroyed during a chemical reaction.
The total mass of reactants is always less than the total mass of products.
Mass is neither created nor destroyed in any physical or chemical change.
The mass of a substance changes depending on its state of matter.
2. If 10 grams of hydrogen react completely with 80 grams of oxygen, what mass of water will be produced?
10 grams
70 grams
80 grams
90 grams
3. When ice melts into water, its mass decreases.
True
False
4. The ashes left after burning wood have less mass than the original wood because some mass was destroyed.
True
False
5. The Law of Conservation of Mass states that mass is neither nor in any ordinary chemical or physical change.
6. In a closed system, the total mass of the before a reaction must equal the total mass of the after the reaction.
7. Explain what happens to the mass of a burning candle. Does it disappear? Relate your answer to the Law of Conservation of Mass.
8. Describe an experiment that could demonstrate the Law of Conservation of Mass. Include the materials you would use and what observations you would make.