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The reactants=products. The mass of the reactants will equal the mass of the products. No new product is made; the reactants are rearranged.

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A new substance is created. In a chemical reaction, the reactants are transformed into new products. Recall that due to the law of conservation, the same number of atoms and elements in the reactants will also be in the products.

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CGL TPO - Do you see evidence of a sudden color change? Were bubbles produced? Did you see a light produced? Did the temperature increase or descrease? Did a solid form when only liquids were combined? Was there a sudden change in odor? If you answered yes to any of these questions, you were probably observing a chemical change!

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The substances to the right of the reaction arrow that are created from the reactants in a chemical reaction.

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The substances to the left of the reaction arrow that are transformed into products duing a chemical reaction.

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A compound is two or more elements bound together, such as water.

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An expression that shows all of the elements in a compound.

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A molecule of an element is two or more of the same type of atom joined together. A molecule of a compound is atoms of different elements joined together. 

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Two or more atoms joined together.

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The periodic table contains all known elements.

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An element is the simplest form of a substance. It cannot be broken down into simpler substances.

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Atoms are composed of neutrons, protons, and electrons. 

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The most basic unit of matter that elements are made up of.

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Indicates a sub group in a chemical formula.

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The number that comes before the element symbol in a chemical formula. In math the coefficient often comes before the variable.

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The number that comes after an element in a chemical formula. It indicates the number of atoms in that element.