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Example: Rotting Banana
I know this chemical reaction has happened because the banana rots and gives off a bad odor.

This evidence shows a chemical reaction because oxygen reacts to the polyphenol oxidize enzyme in the banana.

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Example: Baking a Cake
I know this is a chemical reaction because the heat while baking a cake reacts with the baking powder used in a cake.

This evidence shows a chemical reaction because the two substances form a cake.

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Example: Adding Magnesium Sulfate to water
I know this is a chemical reaction because you add to liquids to each other and they form a solid.
MgSO⁴+ H²O

This evidence shows a chemical reaction because the two substance form a solid called magnesium sulfate heptahydrate.

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Example: Burning Wood
I know this was a chemical reaction because  the wood changes to ash which is a temperature change. It is a exothermic reaction which means it gets hotter.

This evidence shows a chemical reaction because it creates new substance like ash and carbon dioxide

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Example: Rusty Nail
I know a chemical reaction happened because a color is on the nails and a new substance called rust appears on the surface of the nail.
Fe²O3 is this compound formula.
This evidence shows a chemical reaction because their is a new compound called Iron-Oxide that is on the nail.

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Example: Baking Soda Volcano
I know a chemical reaction has happened because the  red liquid starts fizzing over the top of the glass.

This evidence shows a chemical reaction because it fizzes which is part of F.A.C.T.S.S.

First 40 seconds of video

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Baking Soda Volcano Experiment - Science Projects for Kids | Educational Videos by Mocomi