Question

which statement is the best description of a chemical reaction?
o mixing two substances
o forming or breaking bonds
o the decomposition of particles
o the combustion of a substance

Explanation:

A chemical reaction involves the rearrangement of atoms, which occurs through the breaking of existing chemical bonds in reactant molecules and the formation of new bonds in product molecules. Mixing two substances may just form a mixture (a physical change). The decomposition of particles is too vague. Combustion is a type of chemical reaction but not the general description.

Answer:

forming or breaking bonds