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Chemical Reactions

Chapter 5

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.
Products A substance formed as a result of a chemical reaction.
Presipitate 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 chemical reactions.
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 chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Sythesis A chemical reaction in which two or more simple substance 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 Engery The minimum amount of energy needed to start a chemical reaction.
Concentration The amount if one material in a certain volume of another Material.
Catalyst A material that increases the rate of a reaction by lowering the activation energy.
enzymes A type of protein that speeds up a chemical reaction in a living thing; a biological catalyst that lowers the activation energy of reaction in cells.
inhibitor A material that decreases the rate of a reaction.
Created by: hassanm