science
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| chemistry | is the study if properties of matter and how matter changes
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| element | is a substance that cannot be broken down into any other substances by chemical or chemical means
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| compound | is a substance made of two or more elements chemically combined in a specific ration or proportion
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| mixture | is made of two or more pure substances elements compounds or both that are in the same place but not combined as a new material
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| solution | is a well mixed mixture
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| physical change | a change that alter the form or appearance of material
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| chemical change | a change in matter that produces new sub stance
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| precipitate | a solid that forms from solution during a chemical reaction
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| atom | the smallest particle of an element
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| molecule | is the combination of two or more atoms
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| chemical bond | the force that holds atoms together
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| chemical equation | is a shorter easier way to show chemical reactions using symbol instead of words
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| symbol | most elements a represented by a one-letter or two letter
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| chemical formula | a compound is represented by a word
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| subscript | show the number of atoms of an element in a molecule
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| reactants | the materials you have at the beginning of a chemical reaction
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| products | when the reaction is complete you have different materials
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| coefficient | is a number in front of a chemical formula in the equation
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| synthesis | when two or more substances combined to make a more complex substance
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| replacement reaction | a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places
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| exothermic reaction | a reaction that releases energy in the form of heat
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| activation energy | is the minimum amount of energy that has to be added to start a reaction
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| concentration | is the amount of one material in a given volume of another material
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| catalyst | is a material that increases the rate of a reaction by lowering the activation energy
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| enzymes | provide a surface on which reactions take place
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| inhibitor | a material used to decrease the rate of a reaction
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| combustion | is a rapid reaction between oxygen and a substance called a fuel
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| fuel | is a material that releases energy when it burns
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