| A | B |
|---|
| chemistry | the science that investigate and explains the structure and properties of matter |
| matter | anything that takes up space |
| property | the characteristics of matter; how it behaves |
| scientific model | thinking device that helps you understand and explain macroscopic observations |
| qualitative | an observation made w/o measurements |
| quantitative | an observation made w/ measurements |
| substance | matter with the same fixed composition and properties |
| mixture | combination of two or more substances in which the basic identity of each substance is not changed |
| physical change | change in matter that does not involve a change in the identity of individual substances |
| physical property | characteristics that a sample of matter exhibits w/o any change in its identity |
| solution | another name for homogeneous mixture |
| alloy | solid solutions that contain diff. metals and sometimes nonmetallic substances |
| solute | the substance being dissolved |
| solvent | substance that dissolves the solute |
| aqueous solution | when the solvent is water |
| element | simplest form of matter that cannot be broken down into simpler substances |
| compound | a chemical combination of 2 or more diff. elements joined together in a fixed proportion |
| formula | combination of the chemical symbols that show what elements make up a compound and the # of atoms of each element |
| mass | measure of the amount of matter that an object contains |
| volatile | a substance that changes to a gas at room temp. |
| density | amount of matter (mass) contained ina unit of volume |
| chemical property | observed only when there is a change in the composition of the substance |
| chemical change | change of one or more substances into other substances |
| chemical reaction | another name for chemical change |
| law of conservation of mass | matter is neither created nor destroyed |
| energy | the ability to do work |
| exothermic | chemical reaction that gives off energy |
| endothermic | chemical reaction that absorbs energy |
