Debate: the mixing of 2 or more substances always results in a chemical change.
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It is not necessary that mixing 2 or more substances will always result in a chemical change. sometimes, it only forms a mixture of those substances, no change in composition occurs.
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Explanation:
The substances do not change. ... Tell students that sometimes when two (or more) substances are mixed together, a change occurs and another substance (or substances) is created. This is called a chemical reaction. Gas may form, heat may be produced, and color may change.
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