Question

1. choose the best answer.

when a(n) ____ agent reduces, it causes oxidation in another substance.

• equating
• oxidizing
• conserving
• reducing

1. choose the best answer.

which of the following describes the law of conservation of mass?

• $\text{mass}_{\text{reactants}} > \text{mass}_{\text{products}}$
• $\text{mass}_{\text{reactants}} \approx \text{mass}_{\text{products}}$
• $\text{mass}_{\text{reactants}} < \text{mass}_{\text{products}}$
• $\text{mass}_{\text{reactants}} = \text{mass}_{\text{products}}$

Explanation:

Question 1

In redox reactions, an oxidizing agent gets reduced (gains electrons) and causes the oxidation (loss of electrons) of another substance. "Equating" and "conserving" are not relevant terms here. A reducing agent gets oxidized and causes reduction in another substance, so the correct term is "oxidizing".

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products because matter is neither created nor destroyed, only rearranged. So \(\text{Mass}_{\text{reactants}} = \text{Mass}_{\text{products}}\).

Answer:

B. oxidizing

Question 2