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chemistry the study of the properties of matter and how matter changes
element a substance that cannot be broken down into any other substances by chemical or physical means
compound a substance made of two or more elements, chemically combined in a specific ration, or proportion
mixture made from two or more pure substances-elements, compound, or both- that are in the same place but not combined as a new material
solution a well-mixture
physical a changes that alters the form or appearance of a material but does not make the material into another substance
chemical change a change in matter that produces new substances
precipitate a solid that form from solution during a chemical reaction
atom the smallest particles of an element
molecule the combination of two or more atom
chemical bond the force that hold atoms together
chemical equation a shorter, easier way to show chemical reactions, using symbols instead of words
symbol most element are represented by a one-letter or two- letter
chemical formula which shows the ratio of element in the compound
subscript show the number of atom of an element in a molecule
reactants the materials you have at the beginning of chemical reaction
products when the reaction is complete you have different materials
coefficient a number in front of a chemical formula in the equation
synthesis when two or more substances (element or compounds) combine to make a more complex substance the process
decomposition reaction breaks down compounds into simpler products
replacement reaction a reaction in which one element replace another in a compound or in which two element in different compound trade places
exothermic reaction a reaction that releases energy in the form of heat
endothermic reaction a reaction that absorbs energy
activation energy the minimum amount of energy that has to be added to start a reaction
concentration 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 reaction take place
inhibitor a material used to decrease the rate of reaction
combustion a rapid reaction between oxygen and a substance called a fuel
fuel a material the releases energy when it burns
Created by: magz25