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This here is a chemical reaction. It is alka seltzer being dropped into water and it fizzes once it is. The alka seltzer contains citric acid and sodium bicarbonate also known as baking soda. Once you drop the tablet into the water, it sinks to the bottom and fizzes which is a chemical reaction and sometimes it also changes the temperature of the water. This happens becasue the acid and baking soda react to the water.

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An example of aroma would be like baking something such as cookies. The way this is a aroma chemical reaction is that it changes in a chemical way. First you start off with this mushy dough that doesn't smell very good at first. After you put it in the oven though, it comes out as a solid and has this delicious smell

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When you mix sodium, a metal the reacts strongly with water, with chlorine they react together a make a new substance. This new substance is called sodium chloride also known as table salt.

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Imagine a hand warmer that comes in those little packages. It is room temperature when it is sitting in the package becasue it isn't exposed to anything. Right when you open the package and take it out, the oxygen will hit it make the hand warmer become warm and activate it which is the chemical reaction.

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If you take a sodium hydroxide solution and pour it into copper sulfate solution it will then create a solid. This happens becasue of the way the chemicals react to each other.

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A color chemical reaction can be seen in many different things. When you have bunsen burner going with its flame and you have a rod and dip it in a chemical, and then you put it in the flame. The flame will grab the chemical on the rod and the flame will end up changing a different color such as blue, green, ect. based on the chemical the od was dipped in.