electrochemistry

Question 1

electrochemistry is the interconversion of

Answer 1

chemical and electrical energy

Question 2

Spontaneous reactions can produce electricity and power

Answer 2

power a nonspontaneous reaction to occur

Question 3

Oxidation means loss of

Answer 3

electrons

Question 4

Reduction is the gain of

Answer 4

electrons

Question 5

whats oil rig

Answer 5

Oxidation Is Loss ELECTRONS

Reduction Is gain ELECTRONS

Question 6

redox reactions involve movement of _______ from one _______ to another

Answer 6

electrons

reagent

Question 7

WHAT DOES O2 FREQUENTLY ACT AS

Answer 7

an oxidizing agent

Question 8

Steps for balancing reagents

Answer 8

1. write down two half-reactions containin
2. balance atoms and charges
3. electrons should cancel out
4. add the balanced half reactions
5. check both charges balance

Question 9

Two types of voltaic cells

Answer 9

voltaic cell

electrolytic cell

Question 10

Voltaic/galvantic cells are

Answer 10

spontaneous chemical reaction generates an electric current

Question 11

electrolytic cells are….

and they have to be ……..

Answer 11

non-spontaneous reactions are driven by electric current

Question 12

what things typically contains voltaic/galvantic cells

Answer 12

batteries

Question 13

does Voltaic cell system do work on surrounding or does surrounding do work on it? how>

Answer 13

yes it does work on the surroundings

by converting high energy in reactants in cell to lower energy products

Question 14

does electrolytic cell system do work on surrounding or does surrounding do work on it? how?

Answer 14

the surrounding does work on the electrolytic cell system

Lower energy reactants are converted to higher energy products in ce;;

Question 15

Voltaic cells use _____ reactions (G ___ 0) to do generate electrical energy

Answer 15

spontaneous

G < 0

Question 16

salt in salt bridge go towards

Answer 16

reduction

Question 17

Electric current is

Answer 17

flow of electrons

Question 18

electrons only flow if the ____. force is large enough

Answer 18

driving

Question 19

Anode is the electrode where

Answer 19

oxidation happens

Question 20

cathode is the electode where

Answer 20

reduction happens

Question 21

red cat means

Answer 21

reduction is cathode

Question 22

electrodes are _____ strips connected by an _____ conducting wire

Answer 22

metal

electrically

Question 23

salt bridge: _ shaped tube contains a ___ ____________ solution of an ________ electrolyte

Answer 23

U

gel permeated

inert

Question 24

What does salt bridge do

Answer 24

keeps half cells electrically neutral as ions flow in and out

Question 25

Voltaic cell notation anode cathode

Answer 25

Anodes are on the left cathodes on the right

Question 26

Voltaic cell notation the order of written half cell

Answer 26

written in same order that would appear in their own half cell rxns

Question 27

voltaic cell notation double line

Answer 27

means that half-cells are physically separated

Question 28

voltaic cell notation if needed concentrations.. if not given concentration

Answer 28

it would be in brackets assume 1M

Question 29

voltaic cell notation direction of electron flow

Answer 29

-------->

Question 30

voltaic cell notation comma

Answer 30

shows components taht are in the same phase

Question 31

voltaic cell notation "graphite"

Answer 31

shows any inactive (inert) electrode

Question 32

Differing abilities of the metals to gain electrons gives rise to a ____ _____. Known as __________ ____ (EMF) or cell potential

Answer 32

voltage drop electromotive force

Question 33

multimeter measures

Answer 33

voltage

Question 34

Cell potential (Ecell) is the

Answer 34

difference in electrical potential between two electrodes

Question 35

if Ecell > 0 for VOLTAIC CELLS

Answer 35

spontaneous

Question 36

if Ecell < 0 for ELECTROLYTIC CELLS

Answer 36

non spontaneous

Question 37

Ecell bigger general formula

Answer 37

Eoxidation + Ereduction

Question 38

Are half cell potentials multiplied

Answer 38

no

Question 39

Lower Ecell voltage is always

Answer 39

flipped sign

Question 40

whats S.H.E stand for. what is it

Answer 40

standard hydrogen electrode reference point

Question 41

potentials are determined experimentally from the _______ in potential

Answer 41

difference

Question 42

S.H.E arbitraty value of

Answer 42

0.00V

Question 43

how is Ecell related to thermodynamic property

Answer 43

negative

Question 44

way to determine equilibrium constant for redox

Answer 44

-nFEcell = ΔG° = -RTlnK

Question 45

ECELL (draw triagnle)=

Answer 45

(RT/NF) x lnK

Question 46

K from equilibrium concentration/ partial pressures

Answer 46

k = [C]ᶜ[D]ᵈ/ [A]ᵃ[B]ᵇ

Question 47

K FOR STANDARD STATE THEROMCEMIAL

Answer 47

lnk = -ΔG°/RT

Question 48

K for standard state electrochemical data **IF EQUILIBRIUM INVOLVED REDOX REACTION** also what else need to remember?

Answer 48

lnK = nFE°cell/RT account for the amount of charge transferred

Question 49

Nernst equation

Answer 49

E= E° - RT/nF lnQ

Question 51

cell potential depends on relative ...

Answer 51

concentrations of reactants and products

Question 52

When Q < 1, ln Q < 0, so E cell..... when Q = 1, ln Q = 1, so E cell..... When Q > 1, ln Q > 0, so E cell....

Answer 52

E cell > E° E cell = E° E cell < E°

Question 53

As cell is operated, concentrations of reactants will decrease and products will increase, but overall, this consequence of cell potential is

Answer 53

the overall cell potenetial decrease over time

Question 54

what do concentration cells capture

Answer 54

electrical energy from concentration difference when

Question 55

E cell =. (cathode and anote way_

Answer 55

E cell = E cathode - E anode

Question 56

a concentration cell _____ the effect of concentration differences.

Answer 56

EXPLOITS

Question 57

E cell > 0 as long as the half-cell concentrations are

Answer 57

different

Question 58

Once concentrations in concentration cells equalize, ____ = _____ and current stops ______

Answer 58

Ecell = 0 flowing

Question 59

Galvanization is

Answer 59

coating of iron with zinc

Question 60

at 25C, what altnerate form can i use to find equilibrium constant

Answer 60

logK = nEcell/0.0592