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Chemical Reactions

Science 12/18/14

Physical Change A change that alters the form or apperance of a material but does not make the material into another substance.
Chemical Change A change in whichone or more substances combine or break apart to form new substances.
Reactant A substance that eners 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 change in which energy is released.
Endothermic Reaction A reaction that absorbs energy.
Chemical Equation A short,easy way to show a chemical reaction, using symbols.
Open System A system in which matter can enter from or escape to the surroundings.
Synthesis A chemicalreaction in which two or more simple substances combine to form a new, more complex substance.
Law of conservation of mass The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
Closed System A system in which no matter is allowed to enter or leave.
Decompositon A chemical reaction that breaks down compunds into simpler products.
Coefficient A number in front of a chemical formula in an equation that inicaes how many molecules or atoms of each reactant and product are involved in a reaction.
Replacement A reaction in which one element 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 ina a certain volume of another material.
Enzyme A protein molecule that is a biological catalyst with three characteristics.
Inhibitor A thing that inhibits someone or something.
Catalyst A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Created by: kayesl0816