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One indicator of a chemical reaction is a liquid fizzing.

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ex. - the fizzing of soda upon opening it                              

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ex. - the fizzing of soda upon opening it                              

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Made up of the compound of carbonation - H2CO3 - and the mixture of air - N2O4CH2O.

The carbon dioxide contained in the can does not fizz until it is opened and exposed to air. The sudden exposition to air creates gas bubbles made of carbon dioxide, which is a new substance. This proves that a chemical reaction is taking place.

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ex. - the dissolving of an alka-seltzer tablet 

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ex. - the dissolving of an alka-seltzer tablet 

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The solute is an alka-seltzer tablet which has the chemical formula of NaHCO3 + C6H8O7. This is dissolved in the universal solvent - water, or H20.

When the chemical components of the Alka-Seltzer tablet combine with water, it creates a fizz that emits carbon dioxide. Again, creating a gas which is a new substance.

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How temperature effects the rate of a chemical reaction using the simple reaction of Alka Seltzer and water. Trials are done at room temperature, approx 0 degrees C and approx 60 degrees C. Also a guest appearance by J$$$. Background music is Gangnam Style by PSY.

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A new smell being produced could indicate a chemical reaction taking place.

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The mixture called milk does not have a definite chemical formula. When is gets exposed to air, N2O4CH20 it rots.

Milk, if exposed to air for too long, will eventually go bad. When this chemical change takes place, there is a noticeable and unpleasant smell that results from it. This smell component indicates that the substance has changed, therefore proving that a chemical reaction has occurred.

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A chemical reaction called combustion results in creating a fire. Fire is made primarily up of carbon dioxide, water vapor, oxygen, and nitrogen.

Wood is a natural resource. When it is lit on fire, a gas is emitted into the air and it also produces a strong smell that many people can identify.

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A new color that was not seen before shows a chemical change.

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As shown in the name, luminol is the main ingredient. It is composed of C8H7N3O2. In this video, luminol is also combined with baking soda - NaHCO3, water - H2O, and copper sulfate- CuSO4.

The combination of these substances lead to a blue color being produced. This bright color was not shown before the substances were mixed. A chemical reaction took place during this mixture.

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Liquid Light - Chemical Reaction with Luminol

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If the temperature of a substance changes during a reaction, it was a chemical reaction.

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Baking soda is composed of NaHCO3, which is combined with vinegar - CH3COOH.

The combination should cause the room-temperature vinegar to drop. This is an example of an endothermic reaction, where the heat is being absorbed.

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The chemical formula of this chemical reaction would be  CH4 + 2O2.

Natural gas being exposed to fire produces a significant amount of heat. This would be an example of an exothermic reaction, where the heat is being released.

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Some chemical reactions create a solid figure.

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ex. - mixing silver nitrate and sodium chloride

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ex. - mixing silver nitrate and sodium chloride

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This chemical equation is AgCl + NaNo3.

The solid, AgCl, cannot be dissolved in water. However, when combined with NaNo3, a solid that is commonly labeled "hard water" is created.

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ex. - mixing a baking soda solution and calcium chloride solution

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ex. - mixing a baking soda solution and calcium chloride solution

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NaHCO3 + CaCl2

These two solutions start out as clear, colorless liquids. When they are mixed together, they form a bubbling and white precipitate. A precipitate is the cause of a solid from a solution, indicating a chemical reaction.

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Calcium chloride, baking soda, water reaction

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All chemical reactions create a new substance, so any of my given examples would work with this category.

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This has no specific chemical equation, but it consists of fire and wax.

In this chemical reaction, a gas is being created from the fire, which also gives out an aroma. This is an example of an exothermic reaction because it releases heat.

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When a metal is exposed to moisture (H2O) for a long period of time, it creates rust. Rust has the chemical composition of Fe2O3.

Because water was exposed to the iron, it created a whole new substance that was not there before called rust. This creation has no other signs except creating a new substance.