Classify the chemical reaction:

the element iron reacts with copper sulfate to form the element copper and the compound iron sulfate.

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Single replacement reaction

Explanation:

Question 1

In this question, we're given that copper sulfate reacts with iron. The products are copper and iron sulfate. In the context of this problem, we don't need to know the exact oxidation state of iron, but for the purposes of visualizing it, let's assume that iron has an oxidation state of +2 and let's look at the balanced chemical equation:

Notice that iron metal replaces (or displaces) copper metal from the copper sulfate salt. Whenever this is the case (a metal replaces another metal in a salt), we have a single replacement or single displacement reaction. Both descriptions are completely acceptable.