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This is a sugar, water and baking soda mixture. The baking soda, water, and sugar react and create fizzing which is a result of a chemical reaction because it shows that a new gas has formed.
Baking soda/water chemical equation: NaHCO3 + H2O → H2CO3 + (OH-) + (Na+).

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Alka Seltzer and water mix to create a chemical reaction. The water starts to bubble and fizz because of a new gas is created. Because a new gas is created it is a chemical reaction.
Alka seltzer and water equation: 3NaHCO3 + C6H8O7 → C6H5Na3O7 + 3CO2 + 3H2O
Video:https://www.youtube.com/watch?v=_lmco-D9uas

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A fart is actually a chemical reaction because gas is created by bacteria in our gut.
Chemical equation: CO2+2H20=CH4+2O2

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Burning sugar is a chemical change because it releases a gas (Carbon dioxide). An aroma is also released. The aroma smells like candy or syrup.
Video:https://www.youtube.com/watch?v=XcbLxxLrj5w

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The iodine and starch bond to create a new substance that is blue. This proves it is a chemical reaction because a new substance is made. Video: https://www.youtube.com/watch?v=HO_q8GPl3bE

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Hydrated Copper Carbonate is when copper reacts with things like (oxygen, water and carbon dioxide) it turns from a brownish-redish color to green. An example of this is the Statue of Liberty. It was originally brownish until it eventually turned green. This is a chemical reaction because new pigments are in the new substance that is made when copper reacts with the elements.

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This experiment involves putting an antacid tablet in a cup of room temperature water. The temperature will slowly drop because heat energy was absorbed by the reaction and gas created. This means that the reaction was chemical and endothermic.
Equation: 3NaHCO3 + C6H8O7 → C6H5Na3O7 + 3CO2 + 3H2O

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When silver nitrate mixed with a solution of sodium chloride a precipitate of solid silver chloride is created. This is a chemical reaction because the silver chloride is a new substance that is created when the two substances react.
Equation: NaCl (aq) + AgNO3 (aq) → AgCl (s) + NaNO3 (aq).
Video:https://www.youtube.com/watch?v=4uZqAWwguXU

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When creating a lead and iodide solution it results in the formation of solid yellow matter. This is a chemical reaction because the yellow substance is a new substance.

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Oxygen and Hydrogen react to make a new substance. This new substance is water. Since a new substance is created, it is a chemical reaction.
2H2(g) + O2(g) → 2H2O
Video:https://www.youtube.com/watch?v=hm9me9i13Q8

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Rusting is a result of a chemical reaction between Iron and oxygen. They create a new substance called iron oxide (rust).
Chemical equation:
4Fe+ 3O2 → 2Fe2O.

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https://www.youtube.com/watch?v=Oz20yWivbXw
Youtube link to video (Start at 4:30)