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chemistry is the study of the properties of mater and how matter changes
elenent an element is a substance that cannot be broken down into any other substances by chemical or physical means
compound a compound is a substance made of two or more elements chemically combined is a specific ration, or proportion
mixture a mixture is made from two or more pure substances elements, compounds, or both that are in the same place but not combined as a new material
solution a solution is a well mixed mixture
physical change a change that alters the form or appearance of a material but does not make the material into another substance is called a physical change
chemical change a change in matter that produces new substances is called a chemical change
precipitate a solid that forms from solution during a chemical reaction is called s precipitate
atom the smallest particle of an element is an atom
molecule a molecule is the combination of two or more atoms
chemical bond the force that holds atoms together is called a chemical bond
chemical equation a chemical equation is a shorter, easier way to show chemical reactions, using symbols instead of words
symbol most elements are represented by a one letter or two letter symbol
chemical formula a compound is represented by a "word ," called chemical formula which shows the ratio of elements in the compound
subscript a subscript show the number of atoms of an element is a molecule
reactants the materials you have at the beginning of a chemical reaction are reactants
products when the reaction is complete, you have different materials, called the products of the reaction
coefficient a coefficient is a number in front of a chemical formula in the equation
synthesis when two or more substances (elements or compounds) combine to make a more complex substance, the process is called synthesis
decomposition a decomposition reaction breaks down compounds into simpler products
replacement reaction a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places, is called a replacement reaction
exothermic reaction a reaction that releases energy in the form of heat is called an exothermic reaction
endothermic reaction a reaction that absorbs energy is called an endothermic reaction
activation reaction activation reaction is the minimum amount of energy that has to be added to start a reaction
concentration concentration is the amount of one material in a given volume of another material
catalyst a catalyst is a material that increases the rate of a reaction by lowering the activation energy
enzymes enzymes provide a surface on which reactions take place
inhibitor a material used to decrease the rate of a reaction is called an inhibitor
combustion combustion is a rapid reaction between oxygen and a substance called a fuel
fuel a fuel is a material that releases energy when it burns
Created by: hailey_23