Electrolysis Questions
Back to Module 9 index
(N.B. This quiz will not function correctly
if you have Javascript disabled in your browser)
1.
Complete the following table to show the results of electrolysis
on different compounds:
Compound |
Formula |
Positive
ion |
Negative
ion |
Collects
at positive electrode? |
Collects
at negative electrode? |
copper
chloride |
CuCl2 |
copper |
chlorine |
chlorine |
copper |
aluminium
oxide |
Al2O3 |
aluminium |
oxygen |
oxygen |
aluminium |
lead
bromide |
PbBr |
lead |
bromine |
bromine |
lead |
copper
oxide |
CuO |
copper |
oxygen |
oxygen |
copper |
potassium
iodide |
KI |
potassium |
iodine |
iodine |
hydrogen
(the potassium reacts with the water!) |
2. Complete
the following passage to describe the electrolysis of lead bromide.
Use the words from the box at the bottom to complete the passage.
When
lead bromide is
it contains free
of lead and bromine. Lead is a
so it forms
ions. Bromine is a
so it forms
ions. The
ions are attracted to the negative
where they gain to
form
metal. The
ions are attracted to the positive
where they lose
to form
gas.
Use these
words:
| When
lead bromide is molten
it contains free ions
of lead and bromine. Lead is a metal
so it forms positive
ions. Bromine is a non-metal
so it forms negative
ions. The lead
ions are attracted to the negative electrode
where they gain electrons to
form lead
metal. The bromide
ions are attracted to the positive electrode
where they lose electrons
to form bromine
gas. |
ˆBack
to top of page
| 
01902 551509