Question

Example of thermal decomposition.​

Answer 1

A thermal decomposition reaction can be defined as a decomposition reaction which is activated by thermal energy. In other words, a thermal decomposition reaction requires energy to be supplied to the reactants in the form of heat. Such reactions are generally endothermic since energy is required to break the chemical bonds and separate the constituent elements. A common example of a thermal decomposition reaction is provided below.

CaCO3 → CaO + CO2

When heated, calcium carbonate decomposes into calcium oxide and carbon dioxide. This process is employed in the manufacturing of quick lime, which is an important substance in many industries.

Answer 2

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Example of thermal decomposition.

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Some compounds break down when heated, forming two or more products from one reactant. This type of reaction is called thermal decomposition.

Many metal carbonates can take part in thermal decomposition reactions. For example, copper carbonate breaks down easily when it is heated:

copper carbonate → copper oxide + carbon dioxide

CuCO3 → CuO + CO2

Copper carbonate is green and copper oxide is black. You can see a colour change from green to black during the reaction. The carbon dioxide produced can be detected using limewater, which turns milky.

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