In a chemical change, the substance that you end up with is the

A. Reactant

B. Product

C. Displacement element

D. Exchange element

The reactant is what you begin with.

The product is what you end up with (so the answer is B)

Chemical changes occur when asubstance combines with another to form a new substance, called chemicalsynthesis or, alternatively, chemicaldecomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.