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chemistrychp 2.0
chemistry chapter 2
Question | Answer |
---|---|
a spesific portion of matter in a given region of space that has been selected for study | system |
testable statement | hypothesis |
experimental conditions that stay the same | controls |
experimental conditions that change | variables |
an explanation of a phnomonon | model |
a genralization that explains a body of facts | theory |
something that has size | quantity |
standard units for science | SI |
a measure of gravity on matter | weight |
anything that takes up space | mass |
combinations of SI units | derived units |
the amount of space occupied by an object | volume |
ratio of mass to volume | density |
ratio derived from the equivalace of two units | conversion factor |
mathematical technique for solving measurements | dimentional analysis |
refers to the closeness of a set of measurements | precision |
closeness of measurement to the correct value | acuracy |
the experimental value divided by the real value time 100 | percent error |
the figures of a number that are certain | significant figures |
a constan ratio between two things | directly proportional |