Question

Stoichiometry is defined as:
1) mass and volume relationships in physical changes
2) mass and volume relationships in chemical changes
c) the formation of polymer from monomers

which of the following is not always conserved in a chemical reaction??
a) total number of atoms
b) total number of molecules
c) mass
d) energy

Answer 1

Stoichiometry is 2) mass and volume relationships in chemical changes.

b) the total number of molecules is not always a chemical reaction.

Answer 2

thx