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More examples:
The scent of rotting eggs is an example as well as a certain smell in thunderstorms and sweat.

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NaCl,
CHO,
ONF,
HON,

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During a chemical reaction, fizz sometimes occurs. This is also known as an effervescence. What happens in a chemical reaction is that gas bubbles begin to form. This makes a hissing sound. 

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During a chemical reaction, fizz sometimes occurs. This is also known as an effervescence. What happens in a chemical reaction is that gas bubbles begin to form. This makes a hissing sound. 

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Silver Nitrate, water, and copper also can create solids if they are mixed together.

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Solids can be created in many ways. 1 Silver nitrate (AgNO3) and 2 Sodium Chlorides (NaCl) create a precipitate when mixed together.

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Silver Nitrate + Sodium Chloride reaction

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Watch this video to see a fizzing chemical reaction! Click the link below...
https://www.youtube.com/watch?v=9hBCLoWwcWo
In this video, metals reacts with acids. When this happens, hydrogen gas is released creating a fizzing reaction.

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Temperature                       Examples of exothermic reactions are...                                 -campfires                           -caramelizing sugar

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Temperature                       Examples of exothermic reactions are...                                 -campfires                           -caramelizing sugar

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New substances is a substance that is made from a chemical reaction. A new substance is made from two seperate substances and it obtains some properties from its former substances. A chemical reaction is when bonds are formed and broken. When new bonds, this creates new substances.

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Temperature   Examples of endothermic reactions are...                                 -frying eggs                    -steaming vegetable

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Temperature   Examples of endothermic reactions are...                                 -frying eggs                    -steaming vegetable

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Noble gases give off the purple color, Hydrogen is red, Helium is yellow, Carbon Dioxide is white, and Mercury is blue. These were put into tubes, which caused the different colors. If a color changes, that means that a chemical reaction is taking place as in the picture below.

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An aroma is a certain smell that can be given off during a chemical reaction. It can also change the whole scent entirely.

Examples: One example is mold. It chemically changes the item to give off a new scent

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Watch this video to learn about endothermic and exothermic reactions! Click the link below...
https://www.youtube.com/watch?v=eJXL0IrbtqE
As one can see from watching the video, an endothermic reaction is when gas is stored but not released, and an exothermic reaction is when gas is released. These reactions can be hot or cold.

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Sodium gives off the yellow color in fireworks, Copper gives the blue color, Lithium and Strontium give off a red color, Barium causes green, Calcium causes the orange color, and both Aluminum and Magnesium give off a white color. If many colors appear in fireworks, that means a chemical reaction is taking place as shown in the picture below.