The type of reaction where one compound takes the place of another is called a single displacement reaction or a single replacement reaction.

Here's a breakdown:

* Single displacement reactions involve a more reactive element displacing a less reactive element from a compound.

* The general form of this reaction is: A + BC → AC + B

Example:

Zinc metal (Zn) reacts with hydrochloric acid (HCl) to form zinc chloride (ZnCl₂) and hydrogen gas (H₂):

Zn + 2HCl → ZnCl₂ + H₂

In this reaction, the more reactive zinc (Zn) displaces the less reactive hydrogen (H) from the hydrochloric acid (HCl) molecule.

Key points about single displacement reactions:

* The more reactive element will always be the one that displaces the less reactive element.

* These reactions are often used in the production of metals and other substances.

* You can predict whether a single displacement reaction will occur by using the activity series of metals.