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20 September, 11:20

Explain why the appearance of gas is not always a sign of a chemical change

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  1. 20 September, 12:40
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    The appearance of gas is not always a sign of a chemical change because a gas can be the result of a change of state, which is a physical change. The boiling of water produces water vapor; opening a carbonated beverage releases dissolved carbon dioxide. Hope this answers the question.
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