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One way to know that a chemical change occurs is if, after substances are combined, it begins to fizz. Another word for this is effervescence, which means when gas is released in a liquid.

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An example of an effervescence or fizz, is when an alka seltzer tablet is added to a cup with water and oil. The oil sits above the water because it is less dense.

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Another way to know that a chemical change has occurred is if, after substances are combined, it lets off a new smell. Another word for this is aroma, which means smell.

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When the alka seltzer tablet is dropped into the suspension of oil and water, it drops to the bottom, because it is more dense than both the water and the oil. After it drops to the bottom, it begins to dissolve in the water. Then, a new substance is created in the form of carbon dioxide gas. Because the fizz is gaseous, it is less dense than both the water and oil, so it floats to the top.

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A second example of a fizz or effervescence is when baking soda and vinegar are combined. The vinegar starts off in a cup.

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Next, baking soda is added to the vinegar. The two substances combined begins to bubble, and a new substance, carbon dioxide, is created. This is because it is an acid-base reaction. Baking soda is a bicarbonate (NaHCO₃) and vinegar is an acetic acid (HCH₃COO), which causes them to react and exchange a proton.

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what will happen if you mix baking soda and vinegar SCIENCE!!!!

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Additionally, you know that a chemical change has occurred if, after substances are combined, its color changes into a color unlike the colors of the original reactants.

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An example of an aroma is when bacon fries. Butter or oil is put on a pan and melted. Bacon is then taken out of its package and put on the pan.

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As it fries, it lets off a new aroma. This is because amino acids chemically react with the reducing sugars of the fat while exposed to the heat. The acid and sugars combine and create a chemical change, causing the bacon to smell differently.

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Do you love bacon? I sure do! Do you ever have a craving for bacon, but have none at your house? Really? Me too! If that is true, watch this video of bacon frying! Turn up the volume, hear the sizzles and crackles.

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Another example of a new aroma occuring in a chemical reaction is when milk turns sour. It occurs when milk is exposed to more heat than it should be, causing it to become sour and develop a new smell.

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The milk, once turned sour, cannot be reverted back into its original form. It can also react and turn sour when exposed to acid.

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An example of a chemical reaction shown by a color change is when leaves change colors throughout the seasons. It begins as a green color and changes into either a red, orange, yellow, or brown.

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This is because chlorophyll is released as the seasons change, which alters the color of the leaves from green to red, orange, yellow, or brown. As the chlorophyll is released, a pigment is created that changes the leaves' colors.

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You begin with three solutions...
Solution 1: Add 43 g of Potassium Iodine to 800 mL of distilled water. Then, add it to 4.5 mL sulfuric acid, and stir until the potassium iodine is dissolved.
Solution 2: Add 15.6 g malonic acid and 3.4 g manganese sulfate monohydrate to 800 mL of distilled water, and then add 4 g of vitex starch.
Solution 3: Dilute 400 mL of 30% hydrogen peroxide to 1L.

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Pour solutions 1 and 2 into a beaker together, and turn on a stirring plate. Slowly add solution 3 after mixing solutions 1 and 2. This makes the clear substance  turn different colors. It turns blue, yellow,  and back to transparent, creating a new substance.

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Another way to know that a chemical reaction has occurred is if, after substances have combined, their temperature changes.

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An example of a chemical reaction shown by a temperature change is when hydrochloric acid is added to sodium carbonate. It begins with a small cup of sodium carbonate (Na2Cl3), and hydrochloric acid (2 HCl) is added to it.

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The sodium carbonate reacts with the hydrochloric acid to create many different substances, water and carbon dioxide being two of them. It is an exothermic reaction, where heat is gained, and the temperature rises.

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hydrochloric acid reacts with Sodium carbonate

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Another example of a temperature- changing chemical reaction is photosynthesis. This is the process in which organisms utilize sunlight in order to get food.

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You know a chemical change has occurred if, when liquid substances are combined, a solid, or precipitate, is created.

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The final, and most important way to prove that a chemical change has occurred, is if a new substance is created. If a new substance isn't created, it's not a chemical reaction.

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Photosynthesis is an endothermic reaction, meaning that it absorbs heat. It begins with chlorophyll, carbon dioxide, water, and energy, and creates glucose and oxygen.

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An example of a chemical reaction that creates a precipitate is when copper sulfate and sodium carbonate are combined. The experiment begins with a bit of copper sulfate inside of a cup. Sodium carbonate is added, and a precipitate is created.

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The substances begin as solely copper sulfate and sodium carbonate. Once they are combined, a solid becomes created, and new substances are formed. One example is copper carbonate, or CuCO3

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Precipitation Reaction: Copper Sulfate and Sodium Carbonate

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Another example of a precipitate being created is soap scum. Soap scum is the hardened solid you can see on shower glasses or walls near a shower. It is a white solid that forms from water and soap.

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When soap and hard water are combined, soap scum is created. The soap and water are both liquids, and the soap scum is a solid. The two substances combine to create calcium stearate, magnesium stearate, and other waste products.

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An example of a new substance being created is when sugar is burned. You begin with a tin to keep sugar in, and use tongs to shake it above an intense flame.

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After the sugar is exposed to the heat long enough, new substances are created. The sugar then creates water and carbon dioxide.

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Another example of a chemical reaction creating a new substance is when a bath bomb is put into water. You begin with a bath bomb, which is made up of mostly baking soda and citric acid. You also have a tub of water.

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You then drop the bath bomb into the tub of water. It undergoes a chemical reaction, and creates a new substance; carbon dioxide. This is because as the two substances chemically react, and effervescence is created, and carbon dioxide is released.

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MOST SATISFYING BATH BOMB VIDEO COMPILATION

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