The burning of magnesium is considered a chemical change because a new substance is formed during the reaction.
When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. The burning of magnesium is considered a chemical change because a new substance is formed. During the reaction, magnesium combines with oxygen to form magnesium oxide, which is a different substance than the original magnesium metal. This transformation is characteristic of a chemical change, where new substances with different properties are produced.
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