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chemical reaction

science

TermDefinition
chemistry is the study of the properties of matter and how matter changes
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 chemically combined in a specific ration, or proportion
mixture is made from two or more pure substance-elements,compounds,or both-that are in the same place but not combined as a new material
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
chemical change a change in matter that produces new substances
precipitate a solid that forms from solution during a chemical reaction
atom the smallest particle of an element
moleclue 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, 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 a chemical formula which shows the ratio of elements
subscript show the number of atoms of an element in a molecule
reactants the materials you have at the beginning of a chemical reaction
products when the reaction is complete, you have different materials
conservation of matter the principle stating that matter is not created or destroyed during a chemical reaction
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
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
exothermic reaction a reaction that releases energy in the from of heat
endothermic reacton A reaction that absorbs energy
activation energy is the minimum amount of energy that has to be added to start a reaction
concentration is the amount of one material in a given volume of another material
catalyst is 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
combustion is a rapid reaction between oxygen and a substance called fuel
fuel is a material that releases energy when it burns
Created by: leahpritchett on 2014-03-10



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