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Chemical equations are a way to determine how atoms are rearranged in a chemical reaction.

A balanced chemical equation shows the law of conservation of mass.

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Chemical formulas are a way to tell which elements are in a chemical substance.

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Key Concept: Chemical formulas and chemical equations are used to show how atoms are rearranged to form new substances in a chemical reaction.

The subscripts in a chemical formula tell you how many atoms of each element are in the substance. A coefficient is used before a formula to balance a chemical equation.

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In a chemical reaction, chemical bonds are broken down and atoms rearrange.

A chemical reaction absorbs or releases energy,

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In a chemical reaction, new substances that have different chemical and physical properties than the original substances are formed.

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Four signs that may indicate that a chemical reaction may be taking place are:
1. a change in color
2. a change in the formation of a gas
3. a change in the formation of a precipitate
4. change in energy.

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Key Concept: During chemical reactions, atoms rearrange to form new substances that have different properties than the original substances had.

The properties of the substances mad by a chemical reaction are different from the properties of the starting substances.

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The law that states that "mass cannot be created or destroyed in ordinary chemical and physical changes".

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A substance that forms in a chemical reaction.

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A substance or molecule that is part of a chemical reaction.

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A "representation" of a chemical reaction that uses chemical symbols to and formulas as a short way to describe a chemical reaction.

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A combination of chemical symbols and numbers to represent a substance. It shows how many atoms of each kind of element are in a molecule.

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The law that states that "energy cannot be created or destroyed but can be changed from one form to another".

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A chemical reaction where heat is taken in.

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A chemical reaction in which heat/energy is released.

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A solid substance that forms as a chemical reaction in a solution.

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A process where one or more substances change to make one or more new substances.