Question

A chemical reaction involves the breaking up of chemical bonds between atoms resulting in the _______ and simultaneously the formation of bonds with the ________.

Answer 1

Hint : A chemical reaction is a chemical process in which cleavage of bonds of reactants takes place to form new bonds in the products. In this process, when a chemical bond is broken, then either energy is absorbed as a reactant or released as a product depending upon the properties of the reaction performed.

Complete Step By Step Answer:
A chemical reaction is generally of two types, which is explained as follows:
Endothermic reactions:
These are the chemical reactions which absorb heat to form products. It usually absorbs heat from the surroundings, so after the reaction is completed a cooling effect is created in the surroundings. The enthalpy change for these reactions is positive.
Examples of endothermic reaction: Melting of ice into its liquid phase, the process of evaporation of liquid phase into gaseous phase, etc.
When nitrogen gas is reacted with oxygen gas, it involves absorption of heat energy for every mole of reactant to form nitric oxide. Hence it is an endothermic reaction.
Exothermic reactions:
These are the chemical reactions which release heat energy after formation of products. The enthalpy change for these reactions is negative.
Examples of endothermic reaction: Respiration process, burning a piece of paper, etc.
The combustion reaction of hydrocarbons is also an exothermic reaction.
Hence, a chemical reaction involves the breaking up of chemical bonds between atoms resulting in the absorption of energy and simultaneously the formation of bonds with the release of energy.

Note :
A spontaneous reaction is a chemical reaction in which the formation of a product is favoured. The nature of chemical reactions i.e., the process of transfer of heat can play a role to determine the spontaneity of a reaction. For example: combustion of hydrocarbons is a spontaneous reaction.