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chemical reactions


chemistry the study if the properties of 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, compounds, or both - that are in the same place but not combined as a new material
solution well-mixed mixture
physical changes a change that alters the form or appearance of a material but does not make the material into another substance
chemical changes a change in matter that produces new substances
precipitate a solid that forms form solution 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 a shorter, easier way to show chemical reactions, using symbols instead of words
symbol a one-letter or two-letter symbol that represents most elements
chemical formula a compound that is represented by a"word," shows the ratio of elements in the compound
subscirpt shows the number of atoms of an element in a molecule
reactants materials you have at the beginning of a chemical reaction
products are the different materials you have at the end or finish of a reaction
coefficient a number in front of a chemical formula in the equation
synthesis when two or more substances combined to make a more complex substances
decomposition a reaction that breaks down compounds into simpler products
replacement reactions a reaction in which one element replaces another in a compound or in which two elements different compounds trade places
exothermic reaction a reaction that release 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 reactions take place
inhibitor a material used to decrease the rate of a reaction
combustion a rapid reaction between oxygen and a substance
fuel a material that releases energy when it burns
Created by: tberry1