Question

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5 sodium and chlorine combine to form sodium chloride, or table salt, sodium and chlorine are: a producers b products c reactionaries d reactants

Explanation:

In a chemical reaction, the substances that combine or react are called reactants. Sodium and chlorine combine to form sodium - chloride. So, sodium and chlorine are reactants. "Producers" is a term used in ecology. "Products" are what is formed in a reaction (sodium - chloride is the product here). There is no such term as "reactionaries" in the context of chemical reactions.

Answer:

D. Reactants