Honors Chem. Chap. 3 terms
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Created by:
pcollamore on September 26, 2011
Classes:
visi class of 2014, GVPS Freshmen
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21 terms
Terms | Definitions |
|---|---|
 qualitative measurements | a general description that does not involve a measurement |
| quantitative measurement | a measurement that involves numbers |
| accuracy | how close a measurement is to the true value |
| precision | how close the measurements are to each other (reproducibility) |
| error | the difference between the accepted and experimental values: accepted value - experimental value= |
| accepted value | correct value based on reliable references |
| experimental value | the value measured in the lab |
| percent error | the absolute value of the error divided by the accepted value, times 100%: l error l / accepted value x 100%= |
| metric system | the standards of measurement used in science |
| international system of measurements | the system of units used for measurements in chemistry |
| mega (M) | 1 million times larger than the unit it preceeds |
| kilo (k) | 1000 times larger than the unit it preceeds |
| deci (d) | 10 times smaller than the unit it preceeds |
| centi (c) | 100 times smaller than the unit it preceeds |
| milli (m) | 1000 times smaller than the unit it precedes |
| micro (cursive "u") | 1 million times smaller than the unit it precedes |
| nano (n) | 1000 million times smaller than the unit it precedes |
| pico (p) | 1 trillion times smaller than the unit it precedes |
| volume | the space occupied by any sample of matter; length x width x height |
| mass | a measure of the quantity of matter |
| density | physical property that shows relationship between mass and volume; mass/volume= |
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