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Science vocab

chemistry

TermDefinition
Phisical change A change tjat alters the form or apperance 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 substance
Reactant A substance that enters into 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 consevations of mass The priciple that the total amount of matter is neither created nor destoyed 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 elements 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 mateeial 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
Inhibitor A material that decreases the rate of a reaction
Created by: clivcliv10
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