| A | B |
|---|
| mass | a measure of the amount of matter |
| matter | anything that has mass and takes up space |
| atom | the smallest unit of an element that maintains the properties of that element |
| element | a pure substance made of only one kind of atom |
| compound | a substance that is made from atoms of two or more elements chemically combined |
| extensive property | depends on the amount of matter that is present |
| intensive property | does not depend on the amount of matter |
| physical property | a characteristic that can be observed without changing the identity of the susbstance |
| physical change | a change that does not change the identity of the substance |
| change of state | physical change from one state to another |
| solid | matter with a definite shape and volume |
| liquid | a state of matter with definite volume but not a definite shape |
| gas | has neither definite shape nor volume |
| plasma | state of matter where atoms have lost their electrons |
| chemical property | relates to a substance's ability to change into different substances |
| chemical change | one or more substances is changed into a different substance |
| reactants | substances that react in a chemical change |
| products | substances produced by a chemical change |
| mixture | blend of two or more different kinds of matter, each of which retains its own properties |
| solution | a homogeneous mixture |
| heterogeneous mixture | a mixture that is not uniform througout |
| pure substance | must be either a compound or element |
| groups or families | vertical column of the periodic table |
| periods | horizontal rows on the periodic table |
| metal | a good conductor of heat and electricity |
| nonmetal | an element that is a poor conductor of heat and electricity |
| metalloid | an element with characteristics of both metals and nonmetals |
