Electrochemistry

Question 1

Definition of electrochemistry

Answer 1

production of electricity from the energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations.

Question 2

devices that convert chemical energy to electrical energy

Answer 2

batteries and fuel cells

Question 3

bodily process that uses the concept of electrochemistry

Answer 3

1. communication b/w cells

2. the transmission of sensory signals through cells to brain

Question 4

Daniel cell chemical reaction, electrical potential and conc.

Answer 4

1. Zn(s) + Cu^+2 (aq) ——> Zn^+2(aq) + Cu(s)
2. 1.1V
3. 1 mol dm^-3

Question 5

Daniel cell

Question 5

Daniel cell

Question 5

Daniel cell reduction and oxidation half reaction

Answer 5

Cu^2+ + 2e ———> Cu (s)

Zn(s) ————> Zn^2+ + 2e

Question 5

Daniel cell

Question 5

Daniel cell

Question 6

Define:-

1. electrode potential
2. standard electrode potential
3. cell potential

Answer 6

1. the potential difference between the electrodes and the electrolyte
2. the electrode potential at which all the species involved in the half cell have their conc as unity.
3. the potential difference between two electrodes of a galvanic cell is called so

Question 7

basic information about anode and cathode

Answer 7

anode: - oxidation and -ve potential
cathode: - reduction and +ve potential

Question 8

cell representation of danie cell

Answer 8

Zn(s) | Cu^+2(aq) || Zn^+2(aq) | Cu(s)

Question 9

write the general formula for cell potential

Answer 9

cell potential= electrode potential( where oxidation occurs) + electrode potential (where reduction occurs)

Question 10

what is the electrode of SHE made up of and what is it coated with

Answer 10

made up of :- patinum

coated with :- platinum black

Question 11

what are inert electrodes, give exmapes?

Answer 11

these electrodes do no participate in the reaction but provide their surface for oxidation or reduction, eg:- platinum and gold