test 3 - copy
what does lik dissolve
like
what does adsorb mean
to stick to on the outside
what does desorb mean
unstick from outside
as the mobile phase travels over the stationary phase, what occurs
the mobile phase constantly adsorbs (form weak bonds) onto the stationary phase and desorb (break weak bonds) and go back into mobile phase
how to calculate the retardation factor
(distance component travelled from origin)/(distance solvent travelled from origin) (always less than one)
what does avagadros number mean
the amount of particles in one mol of any atom
what is relative mass based around
carbon 12 (easy to use and abundant for cheap)
has an exact mass of 12 g/mol
or 12 AMU
how to calculate the average relative mass of two isotopes
((relative mass x % of abundance) + (relative mass x % of abundance)) / 100
how do we figure out sig figs
with exceptions like neutrons on a periodic table, they use the lowest sig figs in the given equation
12 g of carbon
1 mole
amount of moles x molar mass is what
mass in grams
what is mass in grams divided by molar mass
anount of moles
avagadros number x moles is what
number of particles
number of particles over moles is what
avagadros number
what is the mole used for
to identify amounts/ratio of mixtures quantitatively and qualitatively
what is precentage composition
the elements present and how much of each element there is
what is the equation for precentage composition
(mass of element in 1 mol of compound / molar mass of compound) x 100
what is empirical formula
simplified molecular formula ratio
what is molecular formula
the actual number of atoms required to make a mol (eg. C6H12O6)
steps to calculate empirical formula
mass (make percentage a gram/assume 100g total)
moles
ratio (divide by smallest moles)
simplify (get to whole #)
also write the symbols in increasing electronegativity
scaling factir equation
(actual molar mass)/(how much you got)
how to find percentage of anundance without either for heavier
(heavier weight x x) + (lighter weight x (100-x) /100