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Four signs that indicate that a chemical reaction may be taking place are a change in the color, the formation of a gas, the formation of precipitate, and a change in energy.

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A chemical reaction is a process in which one or more substances change to make one or more new substances

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A solid that is produced as a result of a chemical reaction in solution.

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A chemical in which heat is released to the surroundings.

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A chemical reaction that requires heat

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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 combination of chemical symbols and numbers to represent a substance.

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A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.

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A substance or molecule that participates in a chemical reaction.

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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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Chemical Reactions produce new substances whose chemical and physical properties differ from the properties of the original substances.

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In a chemical reaction, chemical bonds break and atoms rearrange

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Chemical Reactions absorb or release energy.

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

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Chemical Equations are a concise way to write how atoms are rearranged in a chemical reaction.

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A balanced chemical reaction equation shows the law of conversation of mass