Question

The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a ____
a. combination reaction.
b. decomposition reaction.
c. single-replacement reaction.
d. double-replacement reaction.

Answer 1

Answer: c. single-replacement reaction.

Explanation:

Combination is a chemical reaction in which two or more than two substances combine to form a single product.

$A+B\rightarrow AB$

Decomposition is a chemical reaction in which one substance decompose to form two or more than two products.

$AB\rightarrow A+B$

A single replacement  is a chemical reaction in which a more reactive element displaces a less reactive element from its salt solution, thus one element reacts with a compound to form a new compound and a different element.

$A+BC\rightarrow B+AC$

Double displacement is a chemical reaction in which ion exchange takes place.

$AB+CD\rightarrow AD+BC$

Answer 2

C. single replacement. A single replacement is represented by this formula : AB + C = AC + B