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Fitz Unit 7 Matter
Study Guide for 9th Grade Vocabulary Words
| Term | Definition |
|---|---|
| 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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