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UNIT ONE chemistry
chemistry Unit One
| Term | Definition |
|---|---|
| accuracy | refers to how close a measured value is to an accepted value |
| chemistry | the study of matter and the changes it undergoes |
| conclusion | a judgement based on the information obtained |
| control | in an experiment, the standard that is used for comparison |
| experiment | a set of controlled observations that test a hypothesis |
| hypothesis | a tentative, testable statement or prediction about what is being observed |
| independent variable | in an experiment, the variable that the experimenter plans to change |
| mass | measure that reflects the amount of matter |
| model | visual, verbal, and/or mathematical explanation of data collected from many experiments |
| base unit | defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units |
| qualitative data | information describing color, odor, shape of some other physical characteristic |
| quantitative data | numerical information describing how much, how little, how big, how tall or how fast |
| scientific law | describing a relationship in nature that is supported by many experiemtns |
| scientific method | a systematic approach used in scientific study; an organized process used by scientists to do research and to verify the works of others |
| theory | explanation supported by many experiments; is still subject to new experimental data, can be modified, and is considered valid if it can be used to make predictions that are proven true. |
| weight | measure of an amount of matter and also the effect of Earth's gravitational pull on that matter. |
| dependent variable | in an experiment, the variable that depends on the independent variable |
| conversion factor | ratio of equivalent values used to express the same quantity in different units. it is always equal to one and changes the unit without changing its value |
| density | the amount of mass per unit of volume; a physical property |
| derived unit | a unit defined by a combination of base units |
| dimensional analysis | systematic approach to problem solving that uses conversion factors to move from one unit to another |
| error | differences between an experimental value and an accepted value |
| graph | visual display of data |
| kelvin | SI unit of temperature |
| kilogram | SI base unit of mass |
| liter | metric unit for volume; is equal to 1 cubic decimeter |
| meter | SI unit for length |
| percent error | ratio of an error to an accepted value |
| precision | refers to how close a series of measurements are to one another, show little variation over a series of trials, but might not be accurate |
| scientific notation | express any number as a number between 1-10 (coefficient) multiplied by 10 raised to a power (exponent) |
| second | SI base unit for time |
| significant figure | number of all known digits represented in a measurement plus 1 estimated digit |
Created by:
mrsklann
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