Electro Chemistry

Question 1

What is the oxidation number of free states in redox

Answer 1

Zero

Question 2

What is the oxidation sate of peroxide, contains 2 oxygen

Answer 2

• negitive 1

Question 3

What is the oxidation state of hydride

Answer 3

• negitive 1

Question 4

What steps are taken to balance a reaction (acidic)

Answer 4

• balance metals
• balance O with H2O
• balance H with H+
• balance charge by adding e-

Question 5

What steps are taken to balance a reaction (basic)

Answer 5

• balance metals
• balance O with H2O
• balance H with H+
• add OH for every H+
• balance charge by adding e-

Question 6

What occurs at the anode

Answer 6

Oxidation

Question 7

What occurs at the cathode

Answer 7

Reduction

Question 8

What is the RHE

Answer 8

the right hand electrode is the cathode

Question 9

What is the LHE

Answer 9

the left hand electrode is the anode

Question 10

what is a standard hydrogen electrode

Answer 10

the voltage is zero, so any voltage is purely from the other species

Question 11

What is the equation for E’cell

Answer 11

RHE-LHE (under standard conditions)

Question 13

What is the Nernst equation

Answer 13

Cell energy when the reaction is not under standard conditions

Question 14

What is electrolysis and an exmaple

Answer 14

Forced electrochemistry. For example a battery discharging is the forward spontaneous reaction and charging the battery requires input of energy to do the reverse, non spontaneous reaction

Question 15

What is cathodic protection

Answer 15

Layer of metal to sacrifice to oxidation corrosion instead of the actual structural support from rusting