Question 1

Which BEST explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

Accepted Answer

Gases were released to the atmosphere.

Answer

physical change occurred.

Answer

Precipitates were created in the new solution.

Answer

Atoms involved in the reaction lost mass.

Question 2

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

Accepted Answer

6 atoms of carbon (C)

Answer

3 atoms of carbon (C)

Answer

12 atoms of carbon (C)

Answer

2 atoms of carbon (C)

Question 3

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

Accepted Answer

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

Answer

During a chemical reaction, matter is destroyed.

Answer

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

Answer

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

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