Question

Limestone is a common form of calcium carbonate. When limestone is

subjected to high heat, it becomes calcium oxide and releases carbon
dioxide gas. This change in limestone at a given temperature is an example
of ___________.

A) Sublimation.
B) Oxidation.
C) Decomposition.
D) Precipitation.

Answer 1

The change in limestone when subjected to high heat, resulting in calcium oxide and carbon dioxide gas, is an example of decomposition, a type of chemical reaction.

Step-by-step explanation:

The change in limestone (calcium carbonate, CaCO3) when subjected to high heat resulting in calcium oxide (CaO) and carbon dioxide gas (CO2) is an example of decomposition.

During this process, a single compound breaks down into two or more simpler substances when heated, which is a classic chemical reaction often seen with carbonates such as limestone.

The reaction can be represented by the following equation: CaCO3 → CaO + CO2. This is a fundamental chemical process extensively used in various industries, like the production of quicklime, which has historically been important.