REDOX REACTION JANE

Question 1

What does a redox reaction involve?

Answer 1

A redox reaction involves the transfer of (an) electron(s) from one substance to another

Question 2

Define oxidation

Answer 2

Oxidation is the loss of electrons (OIL)

Question 3

Define Reduction

Answer 3

Reduction is the gain of electrons (RIG)

Question 4

The substance being oxidised is the:

Answer 4

REDUCING AGENT

Question 5

The substance being Reduced is the:

Answer 5

OXIDISING AGENT

Question 6

What are oxidising numbers used for

Answer 6

To work out whether oxidation or reduction is happening to something

Question 7

Rules of oxidation

Answer 7

1) O.N of hydrogen is +1 in a compound (except for hydrides)
2) O.N of oxygen is -2 in a compound (except F2O, H2O2)
3) O.N of a free element is 0
4) In a compound, monatomic atoms take ion charge
5) All O.N add up to the overall charge of the molecule

Question 8

Steps for balancing half equations (KOHES)

Answer 8

1) Balance Key element
2) Balance O with h2o
3) Balance H with H+
4) Balance Electrons with e-
5) Add STATES

Question 9

What is the electrochemical series

Answer 9

A list of reactions listed as reductions.

Question 10

What does the strongest oxidising agent react with

Answer 10

The strongest oxidising agent always reacts with the strongest reducing agent.
Strongest oxidising agent is top left, strongest reducing agent is bottom right
FORMS S SHAPE

Question 11

What is the Salt Bridge

Answer 11

Usually.a filter paper soaked with KNO3.

Question 12

Roles of the Salt bridge

Answer 12

1) Maintain electrical neutrality
2) Complete the circuit

Question 13

Why is KNO3 often used in the salt bridge

Answer 13

Has a high solubility in water and does not react with the chemical present

Question 14

Which electrode does oxidation occur in

Answer 14

The anode, has negative charge

Question 15

Which electrode does reduction occur in

Answer 15

The cathode, has positive charge

Question 16

Mnemonic for Anode, Cathode, redox

Answer 16

AN OIL RIG CAT

Question 17

What 2 components does a Galvanic cell have

Answer 17

An internal circuit
An external circuit

Question 18

What is the internal circuit of a galvanic cell

Answer 18

Electrolytes(ion solutions) +Salt bridge through which ions move and carry the current, thus completing the circuit

Question 19

What Is the external circuit of a galvanic cell

Answer 19

The wire through which electrons (e-) move

Question 20

Formula for EMF Voltage within a cell

Answer 20

Voltage = E^o (oxidating agent) – E^o (reducing agent)
=ALWAYS POSITIVE as it is voltage supplied when the spontaneous reaction occurs

Question 21

Standard Conditions

Answer 21

1M Concentration, 1ATM, 298*k)

Question 22

Why don’t you observe the 2 products you predict from the electrochemical series

Answer 22

1) Rate of reaction too slow
2) Not standard conditions were used (Not 25*C, 1ATM, 1M Solution)

Question 23

How to predict whether a reaction with proceed from E^0 Values

Answer 23

the oxidising agent must be on top of the reducing agent