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Measurement, SigFigs
Term | Definition |
---|---|
qualitative observation | type of observation that describes a characteristic |
quantitative observation | type of observation that provides a numerical measure of something |
mega- | million |
kilo- | thousand |
deci- | tenth |
centi- | hundredth |
milli- | thousandth |
micro- | millionth |
nano- | billionth |
pico- | trillionth |
how many significant figures does the number 606 have? | 3 |
how many significant figures does the number 0.00420 have? | 3 |
how many significant figures does the number 200.0 have? | 4 |
accuracy | how close a measurement is to the correct value |
precision | how close a set of measurements are to each other |
accepted/literature value | a correct value based on credible references |
experimental/your value | the value measured in your lab |
error | the difference between the accepted and experimental values |
chemistry | the science that investigates and explains the structure and properties of matter |
matter | anything that has mass and takes up space (volume) |
pure substance | matter with the same fixed composition and properties |
element | the simplest form of matter, made up of atoms, has one chemical symbol |
compound | a chemical combination of two or more elements joined together in a fixed composition, made of molecules/formula units |
formula | a combination of chemical symbols that show the chemical make-up of a compound and the number of atoms/ions for each element |
mixture | a combination of two or more pure substances in which the basic identity of each substance is not changed |