According to the law of conservation of matter, the number ofis not changed by a chemical reaction A. Molecules
B. bonds
C. products
D. atoms

Atoms

Explanation:

According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change.

the dissolution of polymer can be thermodynamically described in 2 steps.