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When the alka seltzer first enter the water the chemicals are released and they react. The citric acid in the alka seltzer mixes with the bicarbonate to form carbon dioxide bubbles.

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Hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. This creates new chemicals carbonic acid and sodium acetate. Those chemicals create the bubbles and foam you see.

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There are 150 organic compounds that go into why bacon smells the way it does. When you cook bacon sugars react with amino acid in the bacon. Its called maillard reaction.

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In coffee the maillard reaction is a big part of why the coffee has the aroma it does. The reactions between the proteins and sugars in the coffee beans producing a range of products. Also decomposition of other compounds in the coffee beans can also produce aroma.

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Iodine clock reaction. It is called a clock reaction because you can change the amount if time it takes for the liquids to turn blue.it is a battle of chemistry between the starch which is trying to turn the iodine blue, and the Vitamin C which is keeping it from turning blue. Eventually the Vitamin C loses and then you get blue.

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When copper reacts with certain elements like oxygen, water and carbon dioxide. Its turns from its reddish brown color to green. This chemical reaction is hydrated copper carbonate.  The green color is the shade of the patina that forms over the copper surface the patina protects the copper from deterioration and creates a light green wall which can be seen on many copper rooftops and copper structures.

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Yeast and hydrogen peroxide.
When yeast was added to hydrogen peroxide, a chemical in the yeast causes a reaction in which the hydrogen peroxide breaks apart to form oxygen gas and water. This reaction causes the temperature to go up.

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Baking soda and vinegar. When the baking soda was added to vinegar, a chemical reaction takes place that produces carbon dioxide gas. This reaction causes the temperature to go down.

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Boiling a egg makes liquid go to solid in a chemical reaction. When you boil the egg proteins inside the egg break and connect with other proteins. These form stronger bonds than before, and forces the liquids surrounded by each protein molecule to be forced out. So it results in the egg becoming solid.

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Cake batter. The heat applied to the cake batter makes baking soda react with acids in the batter to make carbon dioxide which helps the cake rise and turn into a solid.

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When wood starts to get burned bonds break. The process, called pyrolysis, releases atoms and energy. Unbound atoms form a hot gas, combining with oxygen atoms in the air. This reaction creates the new substance ashes.

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Iron reacts with oxygen and water to form rust. Iron and steel rust when they come into contact with water and oxygen. This rust is a new substance.