C3.4 Electrolysis: Preferential discharge

Please write your name and year group

What type of ions do metals make?

• neutral

• Positive

• Negative

• They don't make ions

What type of ions do non-metals make?

• Neutral

• Positive

• Negative

• They don't make ions.

Which is the correct ionic symbol for Aluminium?

• Al^-3

• Al⁺³

• Al

• Aluminium

What do we mean when we say ' copper is discharged at the cathode'?

• Copper is present in the compound

• Copper stays in the solution

• Copper is released from the solution and is able to be collected at the cathode.

• Copper is the least reactive element at the cathode

Why must an ionic compound be a liquid if it is to be separated using electrolysis? Choose the most accurate answer.

• Because the electrons must be ionised to carry an electrical charge.

• Because the electricity won't travel through a solid

• Because the ions must be ionised to carry an electrical charge.

• Because the atoms must be ionised to carry an electrical charge.

What apparatus is label A? (It is connected to the negative side of the battery)

• cathode

• anode

• cation

• anion

What is label D?

• Cathode

• Anode

• cation

• anion

Why might you use this type of apparatus?

• During an exam - it looks better

• Collecting small amounts

• Collecting gases

• When you've run out of beakers (because someone broke them all)

Water splits into two ions - what are they?

• hydrogen and oxygen

• hydrogen and hydroxide

• H- and OH+

• H+ and OH-