Question

In a _______ reaction, the compound breaks down; in a _______ reaction, a single compound is assembled from two or more substances.
A. synthesis; decomposition
B. single-displacement; synthesis
C. decomposition; synthesis
D. decomposition; single-displacement

Answer 1

It's letter C. When ever you read "breaks down" always think decomposition. When you read that compound get together to form "a single" compound, think synthesis.

Answer 2

The correct answer that would best complete the given statement above would be option C. Here is the complete statement. In a decomposition reaction, the compound breaks down; in a synthesis,  reaction, a single compound is assembled from two or more substances. Hope this answer helps.