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When the heat of the flame vaporizes the candle wax, it breaks down the hydrocarbons into separate molecules. Then, the broken down molecules react with the oxygen in the air to create water vapor (H2O) and carbon dioxide (CO2). The aroma is released through this evaporation of molecules in the steam from the hot wax.  The aroma shows a chemical reaction because the scented steam wasn't present before heat was added.

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When the cookie dough is mixed together, that shows a physical reaction because the substances are not chemically combined. However, when heat is applied, a chemical reaction is shown when an aroma is produced. The heat applied breaks down the sucrose in the sugar and it becomes oxidized into glucose and fructose fragments. These compounds differ from the original sucrose compounds in the cookie dough. The aroma is produced when the compounds react further and polymerize to form new organic complexes that give off the smell of freshly baked cookies.

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Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions. Sodium hydroxide is a base, so when you add phenolphthalein, the solution turns pink. This shows a chemical reaction because a new color is produced that wasn't present before the reaction.

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When ice and salt react they produce a chemical change which in the end shows a temperature change. This is used to melt ice and snow during the winter because the salt drops the temperature of the ice down to -28°C (-18°F)

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In the picture, there is a reaction between a baking soda solution and a calcium chloride solution. When these two substances combine, they produce a gas as well as a solid. Once combined effervescence will be produced and a white precipitate is also created. The products are different from the reactants and a precipitate was formed which proves there was a chemical reaction.

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When Barium Chloride solution reacts with Sulphuric acid a white precipitate of barium sulphate is formed. This shows that there was a chemical reaction because a solid was formed from two liquids.

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Precipitation reaction of Barium Chloride and Sulphuric acid

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When the copper in the original Statue of Liberty was exposed to Carbon Dioxide, Oxygen, and Hydrogen, it underwent a chemical reaction causing a color change. This and also other weather contributions affected the color of the Statue of Liberty. This signifies a chemical change because the structure changed color.

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The tablet dropped in the water includes Zinc, Vitamin C, and Copper. When the tablet reacts with the water it dissolves and produces an effervescence which is one of the results of a chemical reaction.

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This chemical reaction shows a new substance being formed because when the wood is set on fire, ash is the new substance that wasn't present before the reaction. The emissions created from the chemical reaction are carbon monoxide (CO), carbon dioxide (CO2), sulfur oxides (SOx), and nitrogen oxides (NOx). This again shows a new substance because new gases were produced.

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Baking soda is a base and vinegar is an acid. When the two materials mix, a chemical reaction occurs and the byproduct is carbon dioxide gas. It is the gas that causes the balloon to inflate this shows a new substance because a gas was made.

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When the baking soda is mixed with vinegar it produces a temperature change because they chemically react with one being an acid and one being base. Baking soda is the compound sodium bicarbonate while vinegar is a diluted solution that contains acetic acid (95% water, 5% acetic acid). In the end, a temperature change occurs signaling a chemical reaction.

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When you add the baking soda to the lemon juice, it produces a carbon dioxide gas because baking soda is an alkaline substance and when it is combined with a citrus acid it becomes a carbon dioxide gas which rises up to creat fizz or effervescence.

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How to make Fizzy Lemonade Science (chemical reaction)