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Chemical Reactions

TermDefinition
physical change A change that alters the form or appearance of a material but doe not make the material into another substance.
Chemical change A change in which one or more substances combine or break apart to form new substances.
reactant A substance that enters into a chemical reaction.
product A substance formed as a result of a chemical reaction.
precipitate A solid that forms from a solution during a chemical reaction.
exothermic reaction A reaction that releases energy, usually in the form of heat.
endothermic reaction A reaction that absorbs energy.
Chemical equation A short, easy way to show a chemical reaction, using symbols.
law of conservation of mass The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
open system A system in which matter can enter from of escape to the surroundings.
closed system a material that decreases the rate of a 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
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 A reaction in which one element replaces another in a compound or when two elements in different compounds trade places
activation energy the minimum amount of energy needed to start a chemical reaction
concentration the amount of one material in a certain volume of another material
catalyst a material that increases the rate of a reaction by lowering the activation energy
enzyme a type of protein that speeds up a chemical reaction in a living thing; a biological catalyst that lowers the activation energy of reactions in cells
inhibiter a material that decreases the rate of a reaction
Created by: 15powelland