Classify the following change as physical or chemical change:
The lighting of an electric lamp.

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Solution

Physical change:
A physical change is a change in which no new substance is formed.
A physical change is temporary and reversible.
In physical change the chemical composition of the original substance is not altered.
For example, drying of wet clothes, breaking of a glass tumbler, drying paints, etc.
When an electric lamp is switched on, an electric current pass through the filament of the lamp.
As a result, the filament glows to give light.
No new substance is formed inside the lamp during this process.
Therefore, the lighting of an electric lamp is a physical change.

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