Question

Substances that are formed as a result of a chemical reaction are called ---- and are written on the ----- side of the equation.

Answer 1

Products are the ultimate chemical entity that is formed during the chemical reaction. The chemical reaction indicates the chemical change and is represented by a chemical equation. The reactants and products are separated by reaction arrows.

Complete answer:
The chemical reaction represents the transformation involving the rearrangements of atoms or molecules between starting substances and lead to new chemical entities by breaking and making of chemical bonds. The starting substances are called reactants while the newly formed chemical entities are called the products. The chemical reaction is symbolically represented by a chemical equation involving the reaction arrow. The chemical equation and rearrangements between starting molecules is illustrated by the following diagram.

From the above diagram, we conclude that $C{{H}_{4}}$ and ${{O}_{2}}$ are reactants while $C{{O}_{2}}$ and ${{H}_{2}}O$ are products.
Therefore, substances that are formed as a result of a chemical reaction are called products and are written on the right hand side of the equation.
Additional information:
Reactions are of two types: 1) Physical reaction 2) Chemical reaction. In physical reaction, the chemical entity remains the same and change occurs only in physical states. For instance, conversion of ice into water and vice –versa. On the other hand, chemical reaction describes chemical change which involves making and breaking of bonds.

Note:
It is important that substances that are formed as a result of a chemical reaction are called products. The chemical reaction is symbolically represented by a chemical equation involving the reaction arrow. The left hand side of the reaction represents the reactants while the right hand side of the equation represents the product.