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Iron and sulfur combine to make Iron sulfide which is a new substance, this new substance proves the a chemical reaction is going on since you can't separate iron sulfide without another chemical reaction.

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When Calcium gluconate (C12H22CaO14) is set on fire  it forms four new substances, water, carbon,carbon dioxide,and calcium oxide, these new substances prove that a chemical reaction occurred, since you can't change these compounds physically back to clacium gluconate

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When Mercury thiocyanate is set on fire a new substance is form the new substance seems to rise out of the Mercury thiocyanate giving it it's name the pharaoh's snake, when the reaction is done you're left with carbon nitride, carbon oxide,and sulfur oxide, these new substances created prove a chemical reaction occurred since the products can no longer be changed back into Mercury thiocyanate without another chemical change.

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How to make the Pharaoh's Serpent (Mercury (II) Thiocyanate)

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Warning: This experiments requires the handling of dangerous and volatile chemicals. It must only be carried out in a fumehood or outdoors. All chemicals must be disposed of properly. Everything will be contaminated with mercury/mercury salts. NOTHING CAN GO DOWN THE DRAIN OR IN THE GARBAGE.

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When lead nitrate, and sodium sulphate are combined they form sodium, nitrate and the precipitate lead sulphate The precipitate proves that a chemical reaction occurred since we can no longer go back to the original compounds, and two new chemicals were formed.

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Chemical Reaction Between Sodium Sulphate

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lead (II) nitrate & sodium sulfate Mixed Keeshia & Alissa

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When you mix solver nitrate, and sodium chloride the liquids react to form a precipitate, the solid AgCl (silver chloride) Is insoluble in aqueous solutions, such as NaNo3 the other compound formed in the chemical reaction, the precipitate formed proved that a chemical reaction occurred since the precipitate is a new substance.

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Silver Nitrate + Sodium Chloride reaction

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When Sodium sulfide and Cadmium nitrate are combined in the liquid state, they form a precipitate of Cadmium sulfide, since the combination formed a precipitate we know that it's a chemical reaction, since a new substance is being formed the precipitate

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When vinegar is added to steel wool it cause the protective coating to dissolve, and aids in the oxidation process, the metal is exposed allowing the iron to mix with oxygen, and create rust, when the iron and oxygen combine they release heat, making it an exothermic reaction, and proving it's a chemical reaction as well.

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When heat/ energy is added to an egg it causes the proteins in the egg to move around, and weaken/break the bonds that hold them together, the longer they're cooked the stronger the bonds are bond, that's why over cooked eggs are very rubbery, this is also an example of an endothermic reaction, because the egg takes in heat to cook.

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Photosynthesis is an example of an endothermic reaction,the chlorophyll is used to help carbon dioxide, and water and energy to create oxygen and glucose, it is a chemical change, because energy which is equal to heat, according to the first aw of thermodynamics so when the energy is taken in so is heat, changing the temperature.

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When baking a cake the heat causes the baking powder to produce tiny bubble, which can make the cake fully, and change color, also the heat causes protein from the egg to change color, this proves that a chemical change is taking place, and new substances were formed, like carbon dioxide, and water.

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When you combine cesium(Cs), and water(H2O). It reacts super quickly by turning bright pink, then the color fades to form a colorless solution of cesium hydroxide, and hydrogen. The color change is an indicator that a chemical reaction occurred, and new substances were formed.

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Caesium in water - why does it do this?!

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So here's a question: when we were filming our caesium in water, we expected it to cause a big explosion, much like the rubidium did. Instead we saw this: a series of small, pulsating explosions as it sank. We shot this three times and it was the same each time.

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When a marshmallow is toasted in a fire that is over 330o the outside of it caramelizes, the sugar (C12H22O11), changes color to a dark amber color as it cooks so you know a chemical reaction is going on, it then splits into carbon dioxide, and water

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Baking cookies is another example of a chemical reaction that creates an aroma. The aroma is an indicator since, it shows you that a new substances was formed, and that a chemical reaction is taking place

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When wood burns, it is chemically reacting, and giving off new smells, the smell of fire, and ash this is because of the carbon dioxide which is given off, as the bonds in wood, are broken, and gas in the form of smoke is released, the new smell also proves that a chemical reaction is going on.

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The burning of the gas in a car (C8H18) to make it move is an example of a chemical reaction, the gas combines with oxygen molecules and  turns into exhaust(Carbon dioxide, water, and sometimes carbon monoxide), and gives off an aroma so you know that a new substance was created.

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Baking soda and vinegar react with each other. The sodium bicarbonate, and acetic acid react,because one is an acid and one is a base, the products created are carbon dioxide, water, and sodium acetate which cause it to bubble, and fizz.

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This example of effervescent, is also an example of decomposition. Firstly hydrogen peroxide is added to yeast or soap, to speed up the decomposition process then the hydrogen peroxide is exposed to light which causes it to fizz, because it broke down into water and oxygen

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This is an example of effervescent is when an Alka seltzer tablet composed of citric acid and baking soda is dissolved in water, the water dissolves  the solid form of the acid and the acid and base combine releasing sodium citrate, water and carbon dioxide causing it to bubble

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                       Aroma                  

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                       Aroma                  