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What happens when a substance undergoes a chemical change?
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What happens when a substance undergoes a chemical change?

User Daniel Da Rocha
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That’s called a chemical reaction
- evidence of a chemical reaction is colour change or gas formed or precipitate (change of state) or an odour is detected
User VoidStar
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The physical property of the substance is different from the substances beforehand, for example, at room temperature, hydrogen and oxygen are gases, but together when they form water, it is liquid at room temperature.
User Kavindu Dissanayake
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