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Demonstration

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Demonstration

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Explanation: Prior to entering the water, the bath bomb is just a solid ball of citric acid and baking soda. When it enters the water, it fizzes and creates effervescence bubbles as a result of a chemical reaction. The reaction is between water and the citric acid and baking soda. Carbon dioxide is produced during the reaction which sparks bubbles. The chemical equation is:
7C₃H₈O --> 3C₇H₁₄O2 + 7H₂O

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Demonstration

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Explanation: Baking soda (bicarbonate) gets added to vinegar, which contains acid. An effervescence (fizz) is produced due to the chemical reaction. The now carbonated acid turns into carbon dioxide which is what causes bubbles to form. The chemical equation of this reaction is CH3COOH+NaHCO3-->  CH3COONa+CO2+H2O.

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Demonstration

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Explanation: Before bacon is cooked, it is a raw piece of pork with no distinct odor. However, after cooked, an odor is produced that was not previously there. This is a salty, yet sweet odor that smells savory. You know that cooking bacon is a chemical change because it produces an aroma that was not priorly there, which is a signal of a chemical change.

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Explanation: Potassium Iodide and Lead Nitrate are both clear liquids. When the two colorless liquids combine and turn yellow, it is clear that a chemical change has occurred. The chemical equation, Pb(NO3)2+2KI--> PbI2+2KNO3 shows that there is a reaction occurring between the two substances to form the new yellow substance. When the lead and iodine mix, the particles form the yellow solid, lead iodide.

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Demonstration

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A Time-lapse of the Rusting of a Steel Plate

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Explanation: The change that takes place between potassium permanganate and glycerin is oxidation. This is a mixture between strong amounts of alcohol and an oxidizing factor. When the two substances combine, they oxidate (from oxygen), and start a fire. This fire burns it. From going to room temperature to burning, that is a temperature change that is increasing the temperature. The chemical equation of this reaction is: MATCH + O2 -> Fire + Ash + CO2 + H2O

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Explanation: This is a contraption that consists of two bags. One contains water, inside a bag containing ammonium nitrate, calcium ammonium nitrate. When the inner bag of water is broken by squeezing or applying pressure to the contraption, it is allowed to dissolve the solid in an endothermic reaction. This means that it absorbs the energy. The temperature was room temperature, but once activated, and the reaction occurs, it is cold and now "ice like".

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Explanation: A flat piece of solid iron, also known as Fe(s), is beginning as the color silver. However, when exposed to oxygen, the iron molecules react with the oxygen molecules to form iron oxide. The iron oxide over time forms rust, which creates a brown coating. Now the piece of iron has changed from silver to brown.

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Explanation: Milk souring is a chemical change because it is an irreversible change. Milk is made of carbon, hydrogen, and oxygen, and when it reacts to exposure to oxygen, and form bacteria. It forms lactic acid bacteria, which ends up in milk in this situation rather than plants. This transforms the milk into lactic acid. More acid means more hydrogen ions, a lower pH and a sour taste. The bacteria causes the milk to rot, which produces an unappetizing odor.

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Explanation:  Milk contains the protein, casein. Red Bull heavily contains acid. Casein in the milk has a negative charge, and there are many unbounded pieces floating around. The base (milk) neutralizes with the acid (Red Bull). Rather than resisting each other, the milk curdles because the casein clumps together. Due to this reaction and the clumps of casein, the top of the cup where both substances were poured turns into a solid yet spongey block.

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Chemical Reaction - Sodium Carbonate and Copper Sulphate | ThinkTac

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Sodium carbonate is a white substance that ad dissolves in water to make positive sodium ions and CO3^2- ions. This forms the mint green copper carbonate solid. This solid takes a little while to form, though after a few ours, it is evident that a chemical change has occurred. The chemical equation of this reaction is: CuSO4+2NaHCO3⟶CuCO3+CO2+H2O+Na2SO4

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Explanation: Before baked, the cookie is actually just liquid batter, that it inedible due to the raw egg. It has no real purpose. However, a chemical reaction occurs as the cookies are baking, causing solid cookies to form. The baking soda (bicarbonate) from the batter and carbon dioxide react with each other to form cookies. This all happens after the baking soda heats up. After, the new substance produced is a cookie, which is a change from a liquid to solid, the cookies are hot during the reaction, not room temperature, they change from light brown to dark brown, and a sweet, warm scent is given off. Chemical equation:  2NaHCO₃ –> Na₂CO₃ + H₂O + CO₂

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Explanation: Sugar beings as white powder miniature crystals, but turns into a liquid when caramelized. What happens is the sugar is exposed to carbon dioxide and bubbles form. Slowly the bubbles simmer down, and what is left is a thick syrupy liquid. This sweet treat, caramel has a very complicated creation process. The caramelization of sugar is a chemical change because it produces a new sweet scent, bubbles in the process, gets heated up to melt, it goes from white to brown, and the caramel eventually dries to form a solid.