Difference Between Physical and Chemical Change

Difference Between Physical and Chemical Change

There are many differences between physical and chemical changes and it is important to understand them to be able to understand these concepts clearly. The comparisons and differences between physical and chemical changes are given below along with their examples.

To understand the physical and chemical properties and changes better, it is important to know what they are and their characteristics. Visit physical and chemical changes to know more about them in detail. In this article, the differences between physical changes and chemical changes are provided in tabular format.

Difference Between Physical and Chemical Change

Physical Change Chemical Change
When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
A physical change involves very little to no absorption of energy. During a chemical reaction, absorption and evolution of energy take place.
Some example of physical change is freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
Generally, physical changes do not involve the production of energy. Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)
In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s).
Physical change is easily reversible i.e original substance can be recovered. Chemical changes are irreversible i.e. original substance cannot be recovered.

These were the physical and chemical change differences that are crucial from the examination point of view. Questions like distinguish between chemical and physical change is common in most exams and related questions might be asked in some competitive exams as well.

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