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How do you know when a chemical reaction is happening?
You will know a chemical reaction has happened when:
THERE IS A CHANGE IN COLOUR!
IT BECOMES HOTTER OR COLDER!
YOU CAN SEE A SOLID FORMING!
YOU CAN START TO SEE BUBBLES!
(e.g. baking soda + vinegar)
IT STARTS TO EMIT LIGHT!
CAN YOU THINK OF ANY OTHER EXAMPLES?
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