Chapter 14 and 15

Question 1

Losing Electrons

Answer 1

Oxidation

Question 2

Gaining Electrons

Answer 2

Reduction

Question 3

Oxidising Agent

Answer 3

Causes Oxidisation

Question 4

Reducing Agent

Answer 4

Causes Reduction

Question 5

Reductant

Answer 5

Undergoes Oxidation, loses electrons

Question 6

Oxidant

Answer 6

Undergoes Reduction, Gains Electrons

Question 7

Rules for Assigning Oxidation Numbers

Answer 7

• Oxidation numbers for atoms are zero
• Oxygen is -2
• Hydrogen in its compound is +1
• H- has the oxidation number is -1

Question 8

Oxidation numbers to identify REDOX

Answer 8

• If the right side, the product, has a higher oxidation number than the left side, the reactant, the reactant molecule or atom is said to have been oxidized.
• Reduction is gain, Oxi is Loss
• No change = not redox

Question 9

What Will react with H+ to form Hydrogen, H2

Answer 9

Metals below Copper, metals above will not react to form hydrogen

Question 10

What metals will react with Water

Answer 10

All metals below Zn

Question 11

Halogens

Answer 11

F2 will displace Cl-, Br-, I-
Cl will displace Br-, I- and NOT F-
Br will displace I-,
I2 will not displace ANYTHING

Question 12

Water + Metal Equation

Answer 12

2H2O (l) + 2 e’ -> H2(g) + 2OH- (aq)

- This is the reduction reaction

Question 13

Metal + Acid

Answer 13

2H+(aq) + 2e’ -> H2(g)

Question 14

Strong Reducting Agents

Answer 14

Everything below Mn(s), ON THE RIGHT

Question 15

Strong Oxidising Agents

Answer 15

Everything Above O2(g) + 4H+, ON THE LEFT

Question 16

Forward Reaction

Answer 16

Reduction

Question 17

Reverse Reaction

Answer 17

Oxidation

Question 18

Halogens

Answer 18

cause oxidation oif another species
- UNDERGOES REDUCTION

-

Question 19

Disproportination

Answer 19

• when a single substance undergoes both reduction and oxidation
• H202-> h20 + 02
• Cu+ -> Cu + Cu2+

Question 20

electrolytic cells

Answer 20

• uses an electric current to bring about a chemical reaction
• RED CAT
• reduction at the cathode
• negative ions go to anode
• positive ions go to cathode

Question 21

Cathode

Answer 21

negative

Question 22

anode

Answer 22

positive

Question 23

flow of electron

Answer 23

anode -> cathode, flow up then down to cathode

Question 24

Electrolysis of solutions

Answer 24

• water can behave as an oxidant or reductant
• becomes oxidised,
• 2h2O -> O2 + 4H+ + 4e’

Question 25

electrolysis definition

Answer 25

• passage of an electric current through an electrolyte with oxidation taking place at the anode and reduction at the cathode

Question 26

What is produced at the cathode and anode

Answer 26

• molten metal halides produce the metal at the cathode

and halogens at the anode