302 Unit 1 Episodes 5-8 Flashcards
For a dissolution to be endo what must happen to change in H for the solution
it must be positive
(change in H of LE + change in H of hydration must be +)
what is the equation for change in H of solution(for a SOLID solute)
change in H of LE + change in H of hydration
what increases the solubility of gas in water
decreasing the temp of the water
increasing the pressure of the water
For solutions of a non-electrolyte, the van’t Hoff factor is:
1
generally is change in H for LE or change in H for solvation greater
change in H for LE (but number is close to 0)
is change in H for LE positive or negative
postive because breaking (TTB)
is change in H for solvation positive or negative
negative because hydrating/forming (FTF)
generally is change in H of solution endo or exo
endo because takes more energy to breeak
what IMF is created when CO2 dissolutes in water
dipole induced dipole solution
what IMF do ideal gases have
ideal gases have NO IMFs
do gases have LE
Gases do NOT have LE
is the dissolution of gas solute in solvent exo or endo
exo because LE is 0 and solvation is always negative
1 ml = how many grams of water?
1 grams
if molarity of K2S is 4 what is the molarity of K+
8 because you would multiply the number of moles per molecule by the previous molarity for the whole solution
what values can you plug into mass action expression for K?
only values at equilibrium
does free energy of liquids and solids change during chem rxn
NO only the free energy of gas
what is the activity of gas x
equal to the pressure of gas x(or gas x/1)
or the concentration of gas x
what is the real technical mass action xpression
activity of product/ activity of reactant
if k is veryy large(greater than 1) what is the composition of our reaction
mostly products
is k is very small(less than 1) what is the composition of our reaction
mostly still reactants
if k is equal to 1(or about) what is the composition of our reaction
equal amount of reactants and products
when does K change
it does NOTTT K is a constant @ equilibrium!
how do you calculate delta n
moles products - moles reactants
if k is greater than 1 is the rxn spon or nonspon
it is spon, favors products
is reactions is spon how does delta G standard of products and reactants compare
there will be a lower Energy(more stable) for products
formula for concentration of particles for each solution
i(van hoff) * molarity of solute
The Bo of a substance equals the applied pressure. The VP is the substance equals?
The applied pressure
The free energy of the gas phase equals what at the normal BP for a given substance
The free enerG of the gas phase equals the free enerG of the liquid phase
Is the change in enthalpy of dissolution always endo
No it can be exo too
If the compound has stronger solute solute attractions the process is
Endothermic
TTB
If the compound has stronger solute solvent attractions the process is
Exo
FTF
What does adding an inert gas do to le chatelier
NUN!!
What can change K
Only temp
Does pressure change k
No, only temp
