302 Unit 1 Episodes 5-8

Question 1

For a dissolution to be endo what must happen to change in H for the solution

Answer 1

it must be positive
(change in H of LE + change in H of hydration must be +)

Question 2

what is the equation for change in H of solution(for a SOLID solute)

Answer 2

change in H of LE + change in H of hydration

Question 3

what increases the solubility of gas in water

Answer 3

decreasing the temp of the water
increasing the pressure of the water

Question 4

For solutions of a non-electrolyte, the van’t Hoff factor is:

Answer 4

1

Question 5

generally is change in H for LE or change in H for solvation greater

Answer 5

change in H for LE (but number is close to 0)

Question 6

is change in H for LE positive or negative

Answer 6

postive because breaking (TTB)

Question 7

is change in H for solvation positive or negative

Answer 7

negative because hydrating/forming (FTF)

Question 8

generally is change in H of solution endo or exo

Answer 8

endo because takes more energy to breeak

Question 9

what IMF is created when CO2 dissolutes in water

Answer 9

dipole induced dipole solution

Question 10

what IMF do ideal gases have

Answer 10

ideal gases have NO IMFs

Question 11

do gases have LE

Answer 11

Gases do NOT have LE

Question 12

is the dissolution of gas solute in solvent exo or endo

Answer 12

exo because LE is 0 and solvation is always negative

Question 13

1 ml = how many grams of water?

Answer 13

1 grams

Question 14

if molarity of K2S is 4 what is the molarity of K+

Answer 14

8 because you would multiply the number of moles per molecule by the previous molarity for the whole solution

Question 15

what values can you plug into mass action expression for K?

Answer 15

only values at equilibrium

Question 16

does free energy of liquids and solids change during chem rxn

Answer 16

NO only the free energy of gas

Question 17

what is the activity of gas x

Answer 17

equal to the pressure of gas x(or gas x/1)
or the concentration of gas x

Question 18

what is the real technical mass action xpression

Answer 18

activity of product/ activity of reactant

Question 19

if k is veryy large(greater than 1) what is the composition of our reaction

Answer 19

mostly products

Question 20

is k is very small(less than 1) what is the composition of our reaction

Answer 20

mostly still reactants

Question 21

if k is equal to 1(or about) what is the composition of our reaction

Answer 21

equal amount of reactants and products

Question 22

when does K change

Answer 22

it does NOTTT K is a constant @ equilibrium!

Question 23

how do you calculate delta n

Answer 23

moles products - moles reactants

Question 24

if k is greater than 1 is the rxn spon or nonspon

Answer 24

it is spon, favors products

Question 25

is reactions is spon how does delta G standard of products and reactants compare

Answer 25

there will be a lower Energy(more stable) for products

Question 26

formula for concentration of particles for each solution

Answer 26

i(van hoff) * molarity of solute

Question 27

The Bo of a substance equals the applied pressure. The VP is the substance equals?

Answer 27

The applied pressure

Question 28

The free energy of the gas phase equals what at the normal BP for a given substance

Answer 28

The free enerG of the gas phase equals the free enerG of the liquid phase

Question 29

Is the change in enthalpy of dissolution always endo

Answer 29

No it can be exo too

Question 30

If the compound has stronger solute solute attractions the process is

Answer 30

Endothermic
TTB

Question 31

If the compound has stronger solute solvent attractions the process is

Answer 31

Exo
FTF

Question 32

What does adding an inert gas do to le chatelier

Answer 32

NUN!!

Question 33

What can change K

Answer 33

Only temp

Question 34

Does pressure change k

Answer 34

No, only temp