Question

1. during a chemical reaction

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

Explanation:

In a chemical reaction, chemical bonds in reactants break and new bonds form to create products. Matter is conserved according to the law of conservation of mass, so it is not destroyed. Atoms are neither created nor destroyed in a chemical reaction, just rearranged. Not all chemical reactions produce a gas.

Answer:

A. chemical bonds break