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Fitz Unit 7 Matter

Study Guide for 9th Grade Vocabulary Words

TermDefinition
density the degree of compactness of a substance
solid firm and stable in shape; not liquid or gas
liquid a substance that flows freely but is of constant volume, having a consistency like that of water or oil
plasma an ionized gas consisting of positive ions and free electrons
temperature the degree or intensity of heat present in a substance or object
pressure the continuous physical force exerted on or against an object by something in contact with it
volume the amount of space that a substance or object occupies
atomic motion the continual movement of atoms and molecules
molecular motion The movement of molecules in a object.
pure substances substances that are made of only one type of atom or only one type of molecule
elements A substance that cannot be decomposed into simpler substances
compounds A substance consisting of atoms or ions of two or more elements that are chemically bonded together
mixtures a combination of two or more pure substances in which each pure substance retains its individual chemical properties
solutions A type of homogenous mixture in which the particles of one or more substances are distributed uniformly throughout another substance
suspension a heterogeneous mixture in which solute-like particles settle out of a solvent-like phase some time after their introduction
colloids a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance
physical properties any property that is measurable
physical changes Any change that occurs without altering the chemical composition of a substance
chemical property a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed
chemical change a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition
phase change a change from one state to another without a change in chemical composition
absolute zero the lowest temperature that is theoretically possible
gas an air-like fluid substance which expands freely to fill any space available, irrespective of its quantity.
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