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unit 1.2


Atom The smallest unit of an element that maintains it's properties
Element A substance that cannot be separated or broken down into simpler substances
Compound A substance made up of atoms of two or more different elements joined by chemical bonds
Mixture A combination of two or more substances that are not chemically combined
Pure substance A sample of matter, either a single element or a single compound, that has definite chemical and physical properties
heterogeneous describes something that does not have a uniform structure or composition throughout
homogeneous describes something that has a uniform structure or composition through out
solid The state of matter in which the volume and shape are fixed
liquid the state of matter that has definite volume but not a definite shape
gas a form of matter that does not have a definite shape or volume
freezing the change of state from liquid to solid
melting the change of state from a solid to a liquid
evaporation a change of state from liquid to gas
boiling the change of state from a liquid to the gas that occurs at a specific temperature
condensation the change of state from a gas to a liquid
sublimation the change of state form a solid directly to a gas
depostion the change of stat from a gas directly to a solid