Chemistry Concepts and Reactions

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Element

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A pure substance made of only one kind of atom

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Molecule of an element

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2 or more atoms of the same element bonded together

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Mixture

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A combination of two or more substances that are not chemically combined and can be separated by physical means.

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Carbon dioxide

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A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis. Formula CO2

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Carbon Dioxide Test

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When bubbled through limewater it turns the limewater cloudy

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Hydrogen

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H

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Hydrogen Test

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Gas burns with a squeaky popping sound

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Oxygen

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O, a gas that is a reactant in the equation for respiration. It is present in the atmosphere at around 18%. Oxygen is reactive and can form compounds with different substances to form oxides.

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Oxygen Test

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Relights a glowing splint.

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HCl

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Hydrochloric acid. This acid can be found in the stomach and reacts readily with active metals such as Magnesium and Zinc. It produces Hydrogen gas when it reacts with metals.