Chemistry fundamentals Flashcards
METRIC units
nano
10-9
micro
10-4
milli
10-3
centi
10-2
kilo
103
mega
106
1000 L =
1M3 (1 METER CUBED)
1 L =
1000 cm3
angstrom
10-10
what is density
mass /volume
usually expressed as kg/m3 but also can be in g/cm3 for the mcat know that the density of water is 1 g/cm3
how do we go from g/cm3 to kg/m3
multiply by 1000
what is the molecular formula?
it gives the identity and number of atoms in the molecule.
what is the empirical formula?
smallest whole numbers, it gives the ratio of atoms
common polyatomic atoms that we need to know for the MCAT
ammonium NH4+
Hydronium H30+
acetate
CH3C02-
BICARBONATE
HCO3-
CYANIDE
CN-
HYDROXIDE
OH-
NITRATE VS NITRITE
NO3-
NO2-
ITE = LESS OXGEN
PERCHLORATE
CL04-
CARBONATE
CO32-
SULFATE VS SULFITE
SO42- , SO32- (ITE= LESS OXYGEN)
PHOSPHATE
PO43-
THE MOLE
One mole of anything has 6.02 x10^23 entities. # moles = mass in grams /molecular weight