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How can you tell if a chemical change has occurred?

How can you tell if a chemical change has occurred?
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How can you tell if a chemical change has occurred?

User Mutttenxd
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You can tell if a chemical reaction has taken place when one or more of the following things happen: There has been a colour change inside the reaction flask. A gas has formed. Usually we know a gas has formed when we can see bubbles
User Tgoossens
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