Law of conservation of _____ states that matter can neither be created nor destroyed. [energy/mass]

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that completes the statement: "Law of conservation of _____ states that matter can neither be created nor destroyed." The options provided are "energy" and "mass."

2. **Identifying the Correct Term**: The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. This means that the total mass of reactants must equal the total mass of products in a closed system.

3. **Analyzing the Options**:
- The "Law of conservation of energy" refers to the principle that energy cannot be created or destroyed, only transformed from one form to another.
...