video

Question 1

for G = -vFE,, what are the units for G

Answer 1

J/mol

also,, standard E gives u standard G

Question 2

when E is positive,, what is favoured

Answer 2

product formation

Question 3

when G is negative,, what is favoured

Answer 3

product formation

Question 4

what K value is needed for products to be favoured

Answer 4

a large positive number

much greater than 1

Question 5

negative E means

Answer 5

non spontaneous in forward direction
reactants are favoured

Question 6

positive G means

Answer 6

not spontaneous forward reaction
reactants are favoured

Question 7

what k value is needed for reactants to be favoured

Answer 7

K needs to be very very small
not negative tho!!

Question 8

gibbs and rate constant

Answer 8

G = -RTln(k)

Question 9

cell diagram,, what goes on the LHS of the salt bridge

Answer 9

the ‘anode’
the thing that is oxidised

start with solid, then aq

Question 10

large Q number

Answer 10

lots of products

Question 11

pro/rea to rea/pro

Answer 11

1/Q answer

Question 12

how do we find ratio of pro and rea

Answer 12

use nernst equation but find Q

Question 13

when balancing 2 equations do u multiply voltage

Answer 13

nope
u multiply everything esle so

Question 14

when theres no solid,, only ions,, how do u write the cell notation

Answer 14

highest oxidation state, lower oxidation state | Pt(s)

we can use Pt bc its inert!!

Question 15

in cell notations,, do we add the big numbers from balancing equations

Answer 15

nope!! dont add the big numbers girl 💗

Question 16

how to balance

Answer 16

balance core element
then oxygens
then hydrogens
then charges

then to combine make sure e- cancel out <3

Question 17

how to balance under basic conditions

Answer 17

do it in acidic ones,, then add X OH to match XH+ to both sides

which turns it into H2O
which u then cancel from both sides

then make sure the charges are equal!!

make sure u add OH- to both sides tho <3

Question 18

what happens when u increase conc of a reactant

Answer 18

more products form

reaction becomes more spontaneous in the forward reaction

more positive Ecell,, CELL POTENTIAL GOES UP!!! more positive = larger number

Question 19

what happens if u decrease the concentration of the reactants

Answer 19

backward reaction occurs to oppose the lower concentration.

backward reaction becomes spontaneous

Ecell gets more negative
forward reaction is less spontaneous

CELL POTENTIAL GOES DOWN,, less positive
smaller Ecell

Question 20

increase product concentration

Answer 20

backward reaction is favoured

forward reaction is less spontaneous. backward reaction is spontaneous. reactants are favoured

Ecell gets smaller!!!

Question 21

decrease product concentration

Answer 21

forward reaction is favoured as le chatliers principle explains how more products will be formed to oppose the lower conc. this means the forward reaction is favoured and more spontaneous

this makes Ecell larger!! due to larger Q, making E larger

Question 22

how do u increase the cell potential

Answer 22

products need to be larger : nominator for Q.

aka formward dreaction must be favoured

aka decrease products
aka increase reactants

Question 23

how do u decrease cell potential

Answer 23

reactants need to be larger (denominator)
aka increase product conc
aka lower reactant conc

Question 24

when is Ecell greater than E*cell

Answer 24

low product conc
high rea conc

Question 25

when is Ecell smaller than E*cell

Answer 25

increase pro conc
decrease rea conc

Question 26

what is Q girl

Answer 26

reaction quotient

basically K ,, but not during equilibrium

conc of pro / conc of rea

POWER OF STOICHIOMETRY!!

only aq allowed ,, no solids

Question 27

E cell =

Answer 27

cathode - (-anode)

cathode + correct anode

Question 28

anode and its mass

Answer 28

loses it

X(s) -> 2e- + X(aq)

Question 29

cathode and its mass

Answer 29

gains it

X(aq) + 2e- -> X(s)

Question 30

in salt bridge,, anions flow towards the

Answer 30

anode

Question 31

in salt bridge cations flow towards the

Answer 31

cathode

Question 32

what does the salt bridge do

Answer 32

prevents the build up of charge

keeps the solutions equal

Zn2+ goes to cathode (cation) bc that side is gaining e- and getting more negative

SO4 2- goes to anode (anion) bc that side is losing e- and getting more positive

Question 33

no salt bridge

Answer 33

equilibrium will occur

e- would start going back to anode

Question 34

what is voltage

Answer 34

the potential difference between 2 points

Question 35

current equation

Answer 35

current = charge / seconds

amp = 1c / second

c = coloumb of charge

Question 36

C is

Answer 36

coloumb
charge

Question 37

J is

Answer 37

energy
work

Question 38

1 volt =

Answer 38

1J / 1C

Question 39

i = Q / t

Answer 39

current (amps) = charge (coloumb) / second

Question 40

when a battery has a positive cell potential,, Ecell,, what can occur

Answer 40

spontaneous reaction
meaning charge is created
work can be done to power things

aka light a light bulb etc

when Ecell = 0.00V,, the cell is dead,, u need a new bettery

Question 41

what do we need to add to a cell notation

Answer 41

states and concentration and pressure!! pressure in atm

Question 42

cell notation conc and pressure when not given

Answer 42

conc = 1M
pressure = 1atm

Question 43

rate constant,, K,, at equilibrium

Answer 43

1

Question 44

why do cations travel towards the cathode

Answer 44

attracted to the e- flowing to the cathode

Question 45

Zn and Cu in

Answer 45

ZnSO4
CuSO4

Question 46

Al and Co in

Answer 46

AlCl3

CoCl3 // CoCl2 depending on the ions (both 1M)

Question 47

maximum amount of work that can be done =

Answer 47

DELTA G

Question 48

can u multiply gibbs to get diff answers

Answer 48

yes

Question 49

can u multiply Ecell to get diff answers

Answer 49

nope