Law of Conservation of Mass Quiz

What does the Law of Conservation of Mass state?

• Mass can be created in a chemical reaction.

• Mass can be destroyed in a chemical reaction.

• The total mass of reactants is equal to the total mass of products.

• The total mass of reactants is always greater than the total mass of products.

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NGSS.MS-PS1-5

In a chemical reaction, what happens to the atoms of the reactants?

• They disappear.

• They rearrange to form new substances.

• They lose mass.

• They change into energy.

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Which of the following examples best demonstrates the Law of Conservation of Mass?

• Burning wood and seeing smoke rise.

• Mixing vinegar and baking soda in a sealed container and finding the mass unchanged.

• Boiling water until it disappears.

• Cutting paper into small pieces.

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NGSS.MS-PS1-5

What happens if a chemical reaction occurs in an open system?

• The total mass may appear to change due to gas escaping.

• The reactants disappear completely.

• Mass is destroyed in the reaction.

• The mass of products always increases.

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When baking a cake, why does the mass of the cake remain the same as the mass of the ingredients?

• New matter is created during baking.

• Mass is conserved as ingredients undergo a physical change.

• The Law of Conservation of Mass applies, and mass is neither created nor destroyed.

• The cake is heavier after baking due to heat.

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In the reaction between barium chloride and sodium sulfate, what forms as a precipitate?

• Sodium chloride

• Water

• Barium sulfate

• Carbon dioxide

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NGSS.MS-PS1-2

Why is it important to measure the mass of reactants and products in a closed system?

• To ensure no matter escapes and mass remains constant.

• To check if mass disappears.

• To prove new mass is created.

• To see if the law only applies to certain reactions.

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NGSS.MS-PS1-5

If 10g of reactants are used in a reaction, what should the mass of the products be?

• More than 10g

• Less than 10g

• Exactly 10g

• It depends on the reaction.

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NGSS.MS-PS1-5

What type of reaction follows the Law of Conservation of Mass?

• Physical changes

• All chemical reactions

• Reactions in open systems only

• Reactions that produce gases only

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NGSS.MS-PS1-2

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If a gas is produced in a reaction and not captured, what might happen to the mass?

• It will appear to decrease.

• It will increase.

• It will remain the same.

• It will be exactly double.

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