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Sci:chemical react

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Whats a chemical reaction? When substances called reactants are transformed into new substances called products.
Whats a physical reaction and give an example. A physical reaction is a reaction that is easily reversible and creates no new products or energy. E,g melting ice into water
Whats a chemical reaction and give an example. A chemical reaction is a reaction that creates new substance or energy and hard to reverse. E.g lighting a candle.
What is the law of conservation? When a chemical reaction occurs, the mass will always stay the same.
Whats activation energy? The minimum energy needed for a reaction to occur, e.g lighting a candle.
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Created by: O15iny
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