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Is breathing a chemical change or physical change?
Breathing is a chemical change as during breathing oxygen is taken inside and carbon dioxide and water are released.
Physical change is the change of that matter where only the appearance or molecular arrangement of matter changes without changing its composition.
Examples: Boiling and freezing of water, melting of wax, mixing sand and grains, crumpling a paper bag, chopping a wood etc.
Properties of physical change are as follows:
• Most of the physical changes are reversible. The original form of the matter can be attained.
• It is a temporary change and no new substance is formed.
• During a physical change, no energy is absorbed or released
• Physical change causes a change in physical properties such as shape, size, etc.
Chemical change: The change in which chemical properties of the matter change is known as chemical change.
During a chemical reaction, the chemical bonds between the molecules are broken and rearranged, and new bonds are formed resulting in the formation of new compounds.
Properties of chemical change are as follows:
1. Chemical changes are irreversible. The original form of the matter cannot be attained.
2. It is a permanent change and one or more new substance is formed.
3. During a chemical change, energy is produced in the form of heat, light or sound, while during a chemical reaction, energy is either absorbed or released.
4. Chemical change causes changes in the physical and chemical properties of the substance.
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