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Chapter 2 Vocabulary

What is Matter

Chemistry The scientific study of the composition, structure, and properties of matter and the changes that matter undergoes
Matter Anything that has mass and takes up space
Element A substance that cannot be separated or broken down into simpler substances by chemical means.
Atom The smallest unit of one type of element that maintains the properties of that element.
Compound A substance made of atoms of two or more different elements that are chemically combined (usually a metal + a nonmetal)
Molecule The smallest unit of a substance that keeps all of the physical and chemical properties of that substance (usually made of nonmetals)
Chemical Formula A notation using a combination of chemical symbols and numbers to represent a substance.
Pure Substance A sample of matter, either a single element or a single compound/molecule, that has definite chemical and physical properties
Mixture A combination of two or more substances that are not chemically combined.
Physical Property A property of matter that describes the substance which is observed WITHOUT a chemical change
Melting Point The temperature and pressure at which a solid becomes a liquid
Boiling Point The temperature at which a liquid becomes a gas
Density The ratio of the mass of a substance to the volume of a substance
Chemical Property A property of matter that describes how the substance reacts with other substances during chemical changes.
Reactivity An ability of a substance to combine chemically with another substance
Flammability The ability of a substance to react in the presence of oxygen and burn when exposed to a flame
Physical Change A change of matter from one form to another without a change in chemical properties
Chemical Change A change that occurs when a substance changes composition by forming one or more new substances
Energy The capacity to do work
Thermal Energy The kinetic energy of a substance's atoms
Evaporation The change of a substance from a liquid to a gas
Sublimation The process in which a solid changes directly into a gas
Condensation The change of a substance from a gas to a liquid
Deposition The process in which a gas changes directly into a solid
Melting The process of a solid changing into a liquid
Freezing The process of a liquid changing into a solid
Created by: cjcarter