4 Electrolysis

Question 1

What is the anode and cathode

Answer 1

Anode is positive attracts negative
Cathode is negative attracts positve

Question 2

At the anode if neither are halides what is th equation and what happens

Answer 2

OH- is discharged
4OH- -> 2H2O + O2 + 4e-

Question 3

What is electroysis

Answer 3

The splitting of ionic compounds for use by putting them through a current

Question 4

2 reasons

Why is graphite used

Answer 4

It is inert(unreactive)
It is a good conductor

Question 5

Describe molten electroysis for Al2O3

Answer 5

Aluminum is attracted to the cathode and is discharged and given 3 electrons it froms a sedement at the bottom of the solution.
Oxygen is discharged and rises and bubbles to the top of the solution and transefres electrons to aluminum becoming discharged.

Question 6

Reactivity scale in specific elements or groups

Answer 6

Potassium
Sodium are group 1
Calcium Magnesium are group 2
Zinc Iron lead are transition
Hydrogen non metal
Copper silver and gold are transition metals

Question 7

How does an ion become discharged

Answer 7

They either gain or lose electrons from the cathode or anode

Question 8

What are the 2 rules of aqeous electroloysis and what is produced

Answer 8

First rule is that at the cathode the weaker cation will discharge so if you had potasssium chloride hydrogen gas would discharge as it is less reactive
Second rule is that at the anode the halide will always disshcarge but is no halide is present hydroxide or oxygen gas will be bubbled away

Question 9

What is carbon displacement