| A | B |
|---|
| homogeneous | a mixture containing substances that are uniformly distributed. |
| heterogeneous | a mixture containing substances that are not evenly distributed |
| pure substance | matter composed of only one kind of atom or molecule |
| mixture | a collection of two or more pure substances physically mixed together |
| solution | stable, homogeneous mixtures |
| compounds | pure substances composed of two or more different elements |
| elements | the 109 simplest substances from which more complex materials are made |
| allotropes | different molecular forms of an element in the same physical state |
| masscal properties | the quantity of matter in an object |
| weight | depends on gravity |
| chemical change | a change that produces one or more new substances |
| physical change | a change that affects only physical properties |
| chemical properties | can be observed only when substances interact with one another |
| physical porperties | can be observed and measured without changing the composition of matter |
| extensive property | properties of matter, such as mass, volume, and length, depend on the quantity of matter present |
| intensive property | all chemical and many phsical properties that do not depend on the amount of matter present |
| endothermic energy | a phsical or chemical change in which a system absorbs energy from its surroundings |
| exothermic energy | a physical or chemical change in which energy is released by a system to its surroundings |
| potential energy | energy an object posses becaus eof its postion |
| kinetic energy | energy that moving objects posses by virtue of their motion |
| filtering | pour liquid onto filter and it seperates the two substances |
| decanting | pour the liquids off and leave the solids behind |
| evaporating | let substance sit out |
| centrifuging | seperates small amounts of substances by spinning |
| chromatography | seperate the components of a solution so that they can be identified |
| distillation | seperating substances that have different boiling points |
