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Chemistry
Test 1
| 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 |