Question

Name the different types of chemical reactions. Explain any two.

Answer 1

Chemical reaction: A chemical reaction is when the bonds are broken within reactant molecules, and new bonds are formed within product molecules to form a new substance.

• The substances that are present on the left side of a chemical reaction are known as reactants
• The substances that are present on the right side of a chemical reaction are known as products
• For example, $\underset{\mathrm{Hydrogen}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to 2\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Different types of chemical reactions are:

• Combination reaction
• Decomposition reaction
• Displacement reaction
• Double Displacement reaction
• Precipitation Reaction

The explanation for any two:

Combination reaction:

• A reaction in which two or more reactants combine to form a single product is known as a combination reaction.
• It takes the form of $\mathrm{X}+\mathrm{Y}\to \mathrm{XY}$
• For example, $\underset{\mathrm{Hydrogen}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to 2\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Decomposition Reaction:

• A reaction in which a single compound breaks into two or more simpler compounds is known as a decomposition reaction.
• It takes the form of $\mathrm{XY}\to \mathrm{X}+\mathrm{Y}$
• A decomposition reaction is just the opposite of a combination reaction.
• Example of a decomposition reaction: $\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}\to \underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Carbondioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$