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Question

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


A

absorption of energy

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B

release of energy

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Solution

(1) A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance.

(2) It is usually accompanied by a release of energy when a chemical bond is broken. Likewise, an input of energy is needed for the formation of chemical bonds.

(3) The supplied/released energy can come in different ways, such as heat, light, and electricity.

Endothermic reactions:

In general, endothermic reactions include the formation of chemical bonds by heat absorption from the surroundings.

Examples:

  • The melting of ice to form water.
  • The baking of bread.

Exothermic reactions:

The release of heat energy produced from bond breakage involves exothermic reactions.

Examples:

Generally referred to as burning, combustion is an exothermic reaction wherein when exposed to an oxidizing agent, a fuel undergoes reduction and becomes an oxidized substance.

Therefore, 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.


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