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Mercury(II) thiocyanate and Ammonium chromate are mixed together in this video and then lit on fire to create this creepy and strange reaction. The snake-like thing appearing out of the fire and ash is a NEW substance, which is why its a chemical reaction.

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Chemische Reaktion der Stoffe NH4Cr2O7 und HgSCN

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In this video, there are many different chemicals combined together into two watery substances. When these two beakers of different substances are combined, after a few seconds, the NEW substance is created and it drastically changes color to black very fast. In every chemical reaction, a new substance is created.

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This video explains the reaction of two aqueous solutions, lead nitrate and potassium iodide. When the two are mixed together, it instantly forms a bright yellow solid precipitate. The solid precipitate is called lead iodide.

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This video explains the precipitation reaction between silver nitrate and salt water. When combined, a solid precipitate forms. The precipitate is silver chloride. Its a chemical reaction because two totally different chemicals combined together, and made a solid.

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Precipitation Reactions: Crash Course Chemistry #9

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This is an example of an extreme chemical reaction called the Thermite Reaction. The Thermite Reaction is an exothermic reaction. A thermite reaction is basically iron oxide (rust) reacting with aluminum to produce molten iron. The reaction is initiated by the heat from burning magnesium ribbon which is placed in the iron oxide/aluminum mixture. The result of this very hot explosion (it goes over the melting point of iron, so to about 2000 degrees celcius) is an iron nugget.

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Exothermic reaction of Aluminum with Iron oxide which create a highy exothermic reaction creating molten iron.

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The chemical burning reactions in the gunpowder in the fireworks vaporize the gunpowder and the color producing chemicals mixed in with the gunpowder. The hot gas atoms frequently collide with each other in the firework explosion. The hot explosion is an example of temperature in a chemical reaction.

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Another example of color change as a chemical reaction is the color journey leaves undergo as the seasons come and leave. Photosynthesis is the chemical reaction that allows plants to harvest the sunlight and use it as food and energy they need to survive. During the seasons of growth for the plants, chlorophyll is constantly produced and broken down, leaving a green color on leaves. Anthocyanins, produced during autumn, turn leaves red. Found in leaves during spring and summer, carotenoids make the yellow, brown, and orange hues. When weather is cooler, all chlorophyll is destroyed, so only the anthocyanins and carotenoids show.

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An example of color change when a chemical reaction occurs is The Statue of Liberty. It is made out of copper. What happens is when copper is exposed to oxygen, carbon dioxide, and water, it turns a greenish color. This specific reaction is called hydrated copper carbonate. Over time, the original brownish-reddish statue of liberty turned this green color. Pennies do the same thing.

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This video talks about non-enzymatic browning. There are two types of non-enzymatic browning, which are caramelization, and the Maillard reaction. The difference between the two is that caramelization is the reaction of sugars with sugars, and the Maillard reaction is the reaction of sugars with amino acids. An example of caramelization is the melting of sugar into a syrup. Its a chemical reaction since you're burning the sugar and melting it. Some of the compounds that result from the sugar melting give melting caramel its look, taste, and smell.

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This video explains how bacon, when cooked gets its delicious smell. Cooking or baking food is a chemical change because it breaks some chemical bonds holding compounds together, and even creates some new ones. Usually, anything that involves fire or burning is a chemical change. The reason bacon smells so good is because of the Maillard reaction. Sugars in the foods are broken down by reaction with amino acids as heating occurs. And the major compounds together that make bacon smell are 2,5-dimethylpyrazine, 2,3-dimethylpyrazine, 2-ethyl-5-methylpyrazine and 2-ethyl-3,5-dimethylpyrazine.

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This is a video of GloZell doing the "Baking Soda and Vinegar Challenge", where you combine baking soda and vinegar in your mouth (the reaction starts at 0:56). This is a "challenge" because the baking soda and vinegar react to each other in an explosive and chemical way. Just like Alka-Seltzer in water, its a chemical reaction because the fizzing and gas is formed and contain different molecules than the ones found in the original substance. In this case, the gas produced from combining the two is carbon dioxide.

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Baking Soda and Vinegar Challenge ... by GloZell

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It SIZZLED IN MY MOUTH! Taste like Salty YUK YUK! Check out more of my videos! xoxo YouTube Challenges | http://bit.ly/GlozellChallenges Collabs | http://bit.ly/GloZellCollabs Cupcake's Beauty Vlogs | http://bit.ly/CupcakesVlogs Sister Inspirationah | http://bit.ly/SistahInspirationah #AskGloZell | http://bit.ly/AskGloZell Daily Vlogs | http://bit.ly/GloZellVlogs Is you okay? Do you wanna be a GloBug?

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When Alka-Seltzer tablets are dissolved in water, bicarbonate forms (from the sodium bicarbonate), which then reacts with hydrogen (from citric acid) to form water and carbon dioxide gas. It "fizzes" up and creates water and carbon dioxide gas, which is a new substance. Fizzing is a chemical reaction because the molecules of that gas may not have been present in the substance before the fizzing.  In the case of a chemical change, the atoms are reconfigured to create new chemical compounds.