Chemistry Articles

AP ChemistryScience of chemistry dates form about 1800, chemistry is an experimental science.
1.Measured Quantities
Length
Volume
Mass
TemperatureKelvin: K= oC + 273.15Celsius: oC = K - 273.15
2.Significant Figures
significant digits: based upon the meaningful digits from the laboratory instrument, know the rules on page 13 of the textbook.
mathematics: multiplication and division addition and subtraction.
3.Conversion FactorsBased on the "bridge" between known and unknown
one step conversions
multiple step conversions
4.Types of Substances
elements: cannot be broken down into two or more simpler substances.Know symbols, location on periodic table.
compounds: contain two or more elements with fixed mass percents.sodium chloride NaCl 39.345 Na, 60.66% Cl
5.Properties of Substances:Used to identify a substance by comparing to the properties of known substances.
chemical properties
physical properties
density
solubility
specific heat: q = m ( T) (Cp)
color
6.Separation of Mixtures
distillation
chromatography