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Gr8 Chemical Intera

Ch 1 Vocabulary Chemical Interactions book

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
compounds a substance made of two or more elements chemically combined in a specific ratio
mixture made from two or more pure substances that are in the same place but not combined as a new material
pure substances element and compounds
solution 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
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
chemical formula an element's one-letter or two-letter symbol
subscript a number written lower and smaller than the symbol of an element; shows the number of atoms of an element in a molecule
reactants the materials at the beginning of a chemical reaction
principle of conservation of mass the amount of matter in a chemical reaction does not change, so the total mass of the reactants must equal the total mass of the products
coefficient a number in front of a chemical formula that tells how many molecules or atoms of each reactant take part in the reaction
synthesis two or more substances combine to make a more complex compound
decomposition breaks down compounds into simpler products
replacement reaction one element replaces another in a compound or two elements in separate compounds trade places
exothermic reaction a chemical reaction that releases energy in the form of heat
endothermic reaction a chemical reaction that absorbs energy
activation energy the minimum amount of energy that has to be added to start a reaction
concentration the amount of material in a certain volume
surface area the amount of exposed material
catalyst a material that increases the rate of a reaction by lowering the activation energy
enzymes biological catalysts that provide a surface on which reactions take place
inhibitor decrease the rate of a chemical reaction by raising the activation energy, making it harder to get the reactions going
combustion a rapid reaction between oxygen and a substance called a fuel
fuel a material that releases energy when it burns
fire triangle 3 things necessary to start and maintain a fire: fuel, oxygen, and heat
Created by: Dcoleman