Question | Answer |
Chemistry | the study of matter and the changes that it undergoes |
Substance | matter that has a definite and uniform composition |
Mass | measurement that reflects the amount of matter |
Weight | measure of the amount of matter and of the effect of Earth's gravity on that measure |
Scientific method | systematic approach used in scientific study to verify the work of others |
Qualitative data | observations of the senses |
Quantitative data | observations of measurements |
Hypothesis | tentative explanation of what ha been observed |
Experiment | set of controlled observations that test the hypothesis |
Independent variable | variable that will change |
Dependent variable | variable that has a value change in response to a change in the independent variable |
Control | Standard for comparison |
Scientific law | relationship in nature that is supported by many experiments |
Base unit | defined unit in a system of measurement |
Derived unit | combination of base units |
Density | physical property of matter |
Dimensional analysis | systematic approach to problem solving that uses conversion factors to move from one unit to another |
Conversion factor | ratio of equivalent values having different units |
Accuracy | how close a measured value is to an accepted value |
Precision | how close a series of measurements are to one another |
Phase change | transition of matter from one state to another |
Mixture | combination of two or more pure substances where each substance retains its chemical properties |
Solution | homogeneous mixture |
Homogeneous mixture | mixture that has constant composition and is blended together; cannot separate |
Heterogeneous mixture | does not blend smoothly; is able to be separated |
Element | pure substance that cannot be separated into simpler substances by physical or chemical means |
Compound | made up of two or more different elements that are chemically combined |