Equations Flashcards
What is the equation for wave speed?
1) Wave speed = wavelength x frequency
What is the equation for the energy of a photon?
1) E = hF
What is the equation for % relative isotopic abundance?
% relative abundance for certain isotope
total relative abundance
What is the equation for moles?
mass
molar mass (RAM)
What is the equation for atom economy?
Mr useful product
———————————————————————-× 100
Mr of all reactants
What is the equation for moles in relation to concentration?
1) moles = concentration x volume dm(3)
How do you convert from cm(3) to dm(3)
cm(3)
1000
What volume is equal to 1dm(3)
1000ml
What is the equation for % purity?
mass compound
———————— x100
mass sample
What is the equation for converting from g –> mols?
concentration mols = concentration g
molar mass
Equation for finding number of particles =
Number of moles x Avogadro’s constant
What is the equation for percentage yield?
actual yield
—————— x100
theoretical yield
What is the equation for making a standard solution from a more concentrated solution?
Volume to use = desired concentration
——————————– x desired volume
actual concentration
percentage error for one reading?
error
——— x100 (x by number of readings taken)
reading
How do you remove the mol-1 sign?
divide or times by avogadros constant
or
dividie by mols
What two units are interchangable?
g and cm3
What is the equation for enthalpy change / energy transferred?
specific heat capacity x mass (cm3) x change in temp (0c)
What unit is enthalpy change given in?
KJ
What is the equation for pV (pressure Pa/Nm-2)(volume m3)?
nRT
(no moles) x (gas constant) x (temp in kelvin)
To to convert from dm3 —> m3
/1000
What is a rule for titration readings?
Titration readings must be to 2 decimal places, with the final digit a 5 or a 0
What is the equation for Kc?
(conc. product)2
(conc. reactant 1) (conc. reactant 2)
% purity?
Mass pure substance
—————————— x 100
mass impure sample
What is the RF value?
distance travelled by solute
distance travelled by solvent
