Question

during a chemical reaction
a chemical bonds break.
b matter is destroyed.
c new atoms form.
d a gas is always produced.

Explanation:

Step1: Analyze option a

In a chemical reaction, chemical bonds in reactants break.

Step2: Analyze option b

According to the law of conservation of matter, matter is not destroyed in a chemical reaction.

Step3: Analyze option c

Atoms are not created or destroyed in a chemical reaction; they are just rearranged.

Step4: Analyze option d

Not all chemical reactions produce a gas. For example, precipitation reactions may not produce a gas.

Answer:

A. chemical bonds break