Question

Write the balanced chemical equation for the following reactions and identify the type of reactions:
Limestone is heated strongly to form Quicklime and carbon dioxide gas is evolved.

Answer 1

Hint: Limestone is a sedimentary rock which consists of Calcium carbonate whose formula is $CaC{O_3}$ . Calcium carbonate is when heated at ${1200^ \circ }C$ it decomposes and carbon dioxide gas is evolved.

Complete step by step answer:
When calcium carbonate $\left( {CaC{O_3}} \right)$ is heated at high temperatures ranging between $1070 - {1270^ \circ }C$ in a rotary kiln, it decomposes into calcium oxide and carbon dioxide gas is evolved. Calcium oxide $\left( {CaO} \right)$ is also known as quicklime or burnt lime or simply lime. The reaction is as follows-
$CaC{O_3}\xrightarrow{{heat}}CaO + C{O_2}$
This reaction is a thermal decomposition reaction. It is because in this reaction a single compound (calcium carbonate) breaks down into two more elements (calcium oxide and carbon dioxide gas) when the single compound is heated at higher temperature.
Calcium carbonate is a white fluffy powder which is insoluble in water. It has many uses-
-In farming to neutralize soil acidity and free soil minerals mostly phosphate for the plants to use.
-In its powdered form it is used in paint, textile, rubber, glass and plastic industry.
-In manufacture of baking soda, toothpaste and in cosmetic products.
-It is used as a building material as marble.

Note:
Quicklime is a white amorphous solid.Quicklime is used in the following-
-In the production of iron and steel.
-In the treatment of water and flue gases.
-It is a key ingredient in the manufacturing of cement and paper.
-It is used as a basic flux.
-It is used in the manufacture of caustic soda.
-In the mining industry.