How does the following chemical equation support the law of conservation of matter? H2 + Br2 —> 2HBr

A. The same type of matter is used on both the reactant and product sides.
B. The number of atoms on the reactant side is the same as the number of atoms on the product side
C. Each atom on the reactant side combines with one another
D. Hydrogen and bromine are used on both sides of the equation

B. The number of atoms on the reactant side is the same as the number of atoms on the product side.

In this equation, there are 2 hydrogen atoms and 2 bromine atoms on the reactant side, and 2 hydrogen atoms and 2 bromine atoms on the product side. This demonstrates that the total number of atoms remains the same before and after the reaction, supporting the law of conservation of matter.