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Chemical Reactions

TermDefinition
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 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 or escape to the surroundings.
Closed System A system in which no matter is allowed to enter or leave.
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.
Inhibitor A material that decreases the rate of reaction.
Created by: 15markleywil
 

 



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