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In this video it shows the experiment of them burning sugar. It turns black and forms a substance called carbon

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C12H22O11(s) + 12 O2(g) -----> 12 CO2(g) + 11 H2O(l)

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When the sugar heats up a lot, it changes colors and creates a new substance. I know that this is a new substance because it created carbon which was not there before.

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In this image it shows how the cookies are expanding.

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2NaHCO₃ –> Na₂CO₃ + H₂O + CO₂

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When cookies are made, they have a smell when they are being baked that was not there before. This is a chemical reaction because baking the cookies created a new smell.

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In this video someone is pouring potassium permanganate into a sugar solution and the color changes to multiple different colors.

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Two step chemical equation for the  different colors.
MnO4 + e → MnO4
MnO₄ + 2H₂O + 2e → MnO₂ + 4OH⁻

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This is a chemical reaction because it changes colors multiple times. When a mixture changes colors, that is a sign that a chemical reaction occurred.

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In this video it shows baking soda and vinegar being combined.

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what will happen if you mix baking soda and vinegar SCIENCE!!!!

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CH3COOH + NaHCO3--> CH3COONa + CO2 + H2O

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This is a chemical reaction because when the two substances combined, it fizzed and exploded which shows that a chemical reaction happened.

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In this video it shows someone putting mentos into coke and it explodes.

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This is a chemical reaction because it shows the coke and mentos fizzing together and fizzing a lot which means it's a chemical reaction.

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This is picture is of soured milk.

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This is a chemical reaction because when it happens a new, bad smelling odor comes from it.

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This picture shows a marshmallow that is a brownish color.

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This is a chemical reaction because when the marshmallow mixes with the fire it changes color to brown or black depending on the amount of time it's in the fire. The changing colors means that its a chemical reaction.

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This picture is of an egg after it has been cooked.

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CaO (s) + H2O (l) → Ca(OH)2 (s)

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This is a chemical reaction because after the egg has been cooked, it it hot where it was not hot before. This is also an endothermic reaction because it takes in heat to be cooked.

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This is an image of wood being burned

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This is a chemical reaction because the wood gets burned it heats up and once it gets burned it can't go back to its original form

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This is a picture of the before and after of baking a cake.

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This is a chemical reaction because it became a solid when it was not a solid before. At the beginning of the thing it was a liquid but after it was baked it was a solid.

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This video shows lead nitrate and sodium sulfate being mixed toget

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lead (II) nitrate & sodium sulfate Mixed Keeshia & Alissa

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Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ + 2NaNO₃

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This is a chemical reaction because when they combine it forms a precipitate, which means it forms a solid.

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This image is of a iron and sulfur chemical reaction

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Fe + S → FeS

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This is a chemical reaction because the iron sulfur create a new substance, making it a chemical change.