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Which evidence is an indication that a chemical reaction has occurred? O boiling of a substance Ofreezing of a substance O formation of a gas Omelting of a substance
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3 votes
Which evidence is an indication that a chemical reaction has occurred?

O boiling of a substance
Ofreezing of a substance
O formation of a gas
Omelting of a substance

User Jszumski
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4 votes

O formation of a gas
User Sadhu
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