The Law of Conservation of Mass

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Which of the following substances CANNOT be broken down into simpler substance? ?

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How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, matter is destroyed.

• During a chemical reaction, the total number of atoms increases.

•  During a chemical reaction, one or more new substances are formed.

• During a chemical reaction, the total amount of matter stays the same.

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NGSS.MS-PS1-5

What happens to the total mass of the substances after a chemical reaction?

• It decreases.

• It increases.

•  It remains the same.

• It increases then decreases.

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NGSS.MS-PS1-2

In a chemical reaction, the number of atoms in the products will always equal which amount?

• the number of atoms in the reactants

• half of the number of atoms in the reactants

• twice the number of the atoms in the reactants

• thrice the number of the atoms in the reactants

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NGSS.MS-PS1-5

Jin bought a heat pack that weighs 15 g. He shook it so it would release heat to warm his hands. The release of heat indicates a chemical reaction took place in a closed system. What would be the mass of the heat pack after the chemical reaction?

• 5 g

• 10 g

• 12 g

• 15 g

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NGSS.MS-PS1-2