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chemical reactions


chemistry is the study of properties
element is a substance that cannot be broken down into any other substance by chemical or physical means
compound is a substance made of two or more elements
mixture made from two or more pure substances
solution a well mixed mixture
physical change a change that alter the form of appearance of a material
chemical change a change in matter that produces a new substance
precipitate a solid that forms during a chemical reaction
atom the smallest particle of an element
molecule the combination of two or more atoms
chemical bond the force that holds atoms together
chemical equation is a shorter easier way to show chemical reactions
subscript shows the number of atoms of an element in a molecule
reactants the material you have at the beginning of a chemical reaction
symbol one or two letter symbol
coefficient a number in front of a chemical formula in the equation
synthesis when two or more substances combine to make a more complex substance
decomposition a reaction that breaks down compounds into simpler products
exothermic reaction a reaction that releases energy in the form of heat
endothermic reaction a reaction that absorbs energy
activation energy is the minimum amount of energy that has to be added to a start a reaction
concentration is the amount of one material in a given volume of another material
catalyst a material that increases the rate of a reaction by lowering the activation energy
enzymes provide a surface on which reactions take place
inhibitor a material used to decrease the rate of a reaction
fuel a material that releases energy when it burns
Created by: dirtnasty