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chemical reaction

science

TermDefinition
chemistry is the study if properties of matter and how matter changes
element is a substance that cannot be broken down into any other substances by chemical or chemical means
compound is a substance made of two or more elements chemically combined in a specific ration or proportion
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
solution is a well mixed mixture
physical change a change that alter the form or appearance of material
chemical change a change in matter that produces new sub stance
precipitate a solid that forms from solution during a chemical reaction
atom the smallest particle of an element
molecule is 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 symbol instead of words
symbol most elements a represented by a one-letter or two letter
chemical formula a compound is represented by a word
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
coefficient is a number in front of a chemical formula in the equation
synthesis when two or more substances combined to make a more complex substance
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 form of heat
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 a fuel
fuel is a material that releases energy when it burns
Created by: killer1
 

 



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