C5

Question 1

What is the substance given off at the anode during electrolysis of an aqueous ionic compound?

Answer 1

If a halogen is present, it is given off (e.g. Cl-) but if not then hydroxide (OH-) is attracted and oxygen is given off

Question 2

What is the substance given off at the cathode during electrolysis of an aqueous ionic compound?

Answer 2

If the cation is more reactive than hydrogen (e.g. potassium K+) then it will stay in solution and H+ hydrogen will be given off, if it is less reactive then it will be given off

Question 3

Reactivity Series

Answer 3

Please Stop Calling My Amazing Child Zydronaus Ilgauskas He Can’t See Gerbils Papi

Potassium, Sodium, Calcium, Magnesium Aluminum, Carbon, Zinc, Iron, Hydrogen, Copper, Silver, Gold, Platinum

Question 4

Describe the redox reactions that occur at the electrodes during electrolysis.

Answer 4

When the cation is attracted to the cathode, it will discharge its electrons onto the cathode so that it has a full shell, which is oxidation since it loses an electron. When the anion is attracted to the anode, it receives the electrons that flow from the cathode to the anode, giving the anions a full shell. This is a reduction reaction, since it gains electrons.

Question 5

What is the liquid that the ionic compounds are placed in during electrolysis called?

Answer 5

Electrolyte (GATORADE - DJ KHALED)

Question 6

Displacement reactions

Answer 6

The more reactive element will displace the less reactive element, resulting in the less reactive element to be given off. eg. Mg + ZnCl -> MgCl + Zn, so zinc is given off as a floating black powder