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When you burn different chemicals is will create a new and different color form the original. This is a chemical reaction because the color is changing

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When nails rust, or oxidation occurs when the oxygen reacts with moisture of the nails. This chemical reaction is a color change as well.

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Cooking bacon is a chemical change because you are applying heat to the bacon which is a temperature change, and the bacon changes color so it is a color change. The smell also makes is a aroma change.

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This is a chemical reaction because the log is going through a temperature change , aroma change, and a color/new substance change. You also cannot turn ashes into its original substance, which is the wood.

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This chemical reaction involves baking soda and lemonade. This happens when the two chemicals mix and start to create fizzing and foaming.

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When you drop an alka seltzer into a glass of water, you may notice that it fizzes, which is a chemical reaction. The citric acid and sodium bicarbonate with water create the fizzing. When they are not inside of the water, it does not fizz because it is not mixing.