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Ch 1.1 Science Vocab

Science Vocabulary Words

TermDefinition
Chemistry the study of the properties of matter and how matter changes
Atom the smallest particle of an element
Precipitate a solid that forms from a solution during a chemical reaction
Reactants a substance that enters into a chemical reaction
Coefficient a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
Concentration the amount of one material in a certain volume of another material
Inhibitor a material that decreases the rate of a reaction
Enzyme a biological catalyst that lowers the activation energy of reactions in cells
Conservation of Mass the principle stating that matter is not created or destroyed during a chemical reaction
Chemical Bond the force that holds atoms together
Synthesis a chemical reaction in which two or more simple substances combine to form a new, more complex substance
Element a substance that cannot be broken down into any other substance by chemical or physical means
Catalyst a material that increases the rate of a chemical reaction by lowering the activation energy
Solution a well-mixed mixture
Subscript a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Endothermic Reaction a reaction that absorbs energy
Symbol a one- or two-letter set of characters that is used to identify elements
Activation Energy the minimum amount of energy that has to be added to get a chemical reaction started
Exothermic reaction a reaction that releases energy in the form of heat
Mixture two or more substances that are mixed together but not chemically combined
Products a substance formed as a result of a chemical reaction
Combustion a rapid reaction between oxygen and fuel that results in fire
Molecule the combination of two or more atoms that are chemically bonded
Chemical Reaction the process in which substances undergo chemical changes that result in the formation of new substances
Chemical Formula a combination of symbols that represent the elements in a compound
Chemical Change a change in matter that produces a new substance
Physical Change a change that alters the form or appearance of a material but does not make the material into another substance
Chemical Equation a short, easy way to show a chemical reaction, using symbols instead of words
Decomposition Reaction a chemical reaction that breaks down compounds into simpler substances
Replacement Reaction a reaction in which one element replaces another element in a compound, or when two elements in different compounds trade places
Fuel a material that releases energy when it is burned
Created by: Mrs. Klein