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Chapter one vocabulary.

Chemistry The study of the properties of matter and how matter changes
Element A substance that cannot be broken down into any other substance by chemical or physical means.
Compound A substance made of two or more elements chemically combined in a specific ratio, or proportion
Mixture Two or more substances that are mixed together but not chemically combined.
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 a matter that produces a new substance
Chemical Reaction The process in which substances undergo chemical change that results in the formation of new substances
Precipitate A solid that forms from a 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 short, easy way to show chemical reactions, using symbols instead of words
Symbol A one or two letter set of characters that is used to identify elements
Chemical Formula A combination of symbols that represent the elements in a compound
Subscript A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Reactants A substance that enters into a chemical reaction
Products A substance formed from a chemical reaction
Conservation of Mass The principle stating that matter is not created or destroyed during a chemical reaction
Coefficient A number in front of the chemical formula in the equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
Synthesis A chemical reaction in which two or more simple substances combine to form a new, more complex substance
Decomposition A chemical reaction that breaks down compounds into simpler products
Replacement Reaction A reaction in which one element element replaces another in a compound; or when two elements in a different compounds trade places
Exothermic Reaction A reaction that releases energy in the form of heat
Endothermic Reaction A reaction that absorbs energy in the form of heat
Created by: 14tcamilli



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