Question

1. choose the best answer.

which of these describes the law of conservation of mass?
mass can be destroyed when energy is added to a chemical reaction.
a catalyst can increase the mass of products in a chemical reaction.
mass can be created or destroyed as a result of a chemical reaction.
mass cannot be created or destroyed as a result of a chemical reaction.

Explanation:

The law of conservation of mass states that in a chemical reaction, mass is neither created nor destroyed. Let's analyze each option:

• The first option says mass can be destroyed with energy, which is wrong.
• The second option claims a catalyst increases product mass, but catalysts only speed up reactions, not change mass.
• The third option says mass can be created or destroyed, which contradicts the law.
• The fourth option matches the law's definition.

Answer:

D. Mass cannot be created or destroyed as a result of a chemical reaction.