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This video shows hydrochloric acid being added to sodium carbonate. When you add hydrochloric acid to sodium carbonate powder it fizzes.  This turns into gas which creates a new substance. This is a chemical reaction because it creates a new substance and it has effervescence. This is an endothermic reaction.

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This is a video of sugar being burned. When you burn sugar it begins to turn brown or black, it burns and then turns into a liquid substance and emits a very pungent sweet/burned Aroma. This is a chemical reaction because a new substance is formed and the combination of sugar and fire create a pungent Aroma. This is an endothermic reaction.

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This video shows Copper Sulfate being added to sodium carbonate. The substance in this video turns from clear to light blue when the copper sulfate is put into the test tube with the sodium carbonate. This is a chemical reaction because it created a precipitate which is a new substance and turned a different color. This is an exothermic reaction.

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Precipitation Reaction: Copper Sulfate and Sodium Carbonate

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This is a video of hand warmers being activated with air. When the iron powder inside of the hand warmer reacts with air to yield iron oxide or rust. This is a chemical reaction because it is creating a new substance and the temperature of the hand warmer is changing when it reacts with air. This is an exothermic reaction

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How-to Use Chemical Heat Hand Warmers Tutorial

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Baking soda solution and Calcium chloride solution

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Baking soda solution and Calcium chloride solution

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This is a video of calcium chloride solution and baking soda solution being added together. This is an endothermic reaction. This mixture forms a solid and a gas in addition it fizzes. This shows that it is a chemical reaction, and a precipitate.

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Calcium chloride, baking soda, water reaction

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A new material is made called rust when you mix oxygen and iron. This forms a new compound. This is a picture of rust. You know this is a chemical reaction because rust forms into a solid sticking on to something else.

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This is a photo of glowsticks all light up. The glow sticks contain two chemicals and a dye. They are called sensitizer, or fluorophore. When you crack the glowsticks these mix together creating the glow that you see. This is a chemical reaction because the sticks are changing color and the two chemicals are mixing to create a new substance. This is an exothermic reaction

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This is a video of alka seltzer dissolving in water. The tablet starts to dissolve and turn into a liquid while making bubbles and a fizzing noise. This is a chemical reaction because it changes into a new substance and it creates effervescence.

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This is a photo of coffee. When water is added to coffee grounds their flavor seeps into the water creating coffee. This mixture creates a very bitter and pungent aroma. This is a chemical reaction because the coffee beans are changing into a new substance and creating a bitter smell.

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Sodium arsenate, glacial acetic acid and sodium thiosulfate

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Sodium arsenate, glacial acetic acid and sodium thiosulfate

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This is a photo of what happens when you add sodium arsenate and glacial acetic acid to sodium thiosulfate. Crystals of golden arsenious sulfide, form making it a new substance and showing how it works. This is a chemical reaction because it changes into a gold color and creates a new substance. This is an endothermic reaction.

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This is a video of Baking soda, vinegar, and water. When the two were combined the temperature of the vinegar decreased. This is a chemical reaction because there is a temperature change and a new substance is created. This is an Exothermic reaction.

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Baking Soda & Vinegar Reaction vs. Temperature

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This is a video of the substance that is formed when silver nitrate and sodium chloride are combined. This creates a precipitate. This is a chemical reaction because there is a new substance formed. This is an endothermic reaction.

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Silver Nitrate + Sodium Chloride reaction