Electrolysis

Electrolysis of molten compounds

Multiple Choice

Molten NaCl can conduct electricity because

• Ions are dissolved in water

• Ions are mobile

• Ions are arranged in a lattice arrangement

Multiple Choice

Molten NaCl contains

• Na⁺ and Cl^- ions

• Na and Cl atoms

• Na and Cl₂ molecules

Multiple Choice

Na⁺ is a ..........., Cl^- is .................

• cation, anion

• anion, cation

Multiple Choice

During electrolysis, cations will move to the ..............., anions will move to the ..............

• anode, cathode

• cathode, anode

Poll

Which of these 2 ions will donate electron(s)?

• Cl^-

• Na⁺

Draw

Since Cl- will donate electron, show the reaction using a half equation

Multiple Choice

Cl^- is ................... by ............. electrons

• reduced, gaining

• oxidised, gaining

• oxidised, losing

• reduced, losing

Multiple Choice

Since Cl atoms do not have a full outer shell, they will share electrons with another Cl atom to form

• Cl₂ molecules

• Cl₂ atom

• Cl^- ion

Electrolysis using concentrated solution

Open Ended

What is the difference between a concentrated vs a molten eletrolyte?

Multiple Choice

In the electrolysis of concentrated aqueous NaCl, the 4 ions which are present in the electrolyte are :

• OH⁺, Cl^-, Na⁺ and H^-

• OH^-, Cl^-, Na⁺ and H⁺

• H₂O and Na⁺ and Cl^-

Open Ended

Which ions move to the cathode?

Multiple Choice

For concentrated electrolyte, at the cathode, there were Na⁺ and H⁺ ions. Which one will be discharged? Follow the discharge series

• H⁺ ion

• Na⁺ ion

Multiple Choice

For concentrated electrolyte, at the anode, there were OH^-and Cl^- ions. Which one will be discharged? DO NOT Follow the discharge series

• Cl^- ion

• OH^- ion

Lets predict products at anode and cathode

Multiple Choice

Electrolysis of concentrated lithium bromide, LiBr.

Ions in electrolyte: Li⁺, H⁺, Br^-, OH^-

• Anode: Bromine

  Cathode: Hydrogen

• Anode: oxygen

  Cathode: Lithium

• Anode: Bromine

  Cathode: lithium

Multiple Choice

Electrolysis of concentrated sodium bromide, NaBr.

Ions in electrolyte: Na⁺, H⁺, Br^-, OH^-

• Anode: Bromine

  Cathode: sodium

• Anode: Bromine

  Cathode: Hydrogen