GCSE CHEMISTRY ELECTROLYSIS EXAM REVISION. QUESTIONS
WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
In the electrolysis of molten lead bromide what is the half equation for the Br- ions? - ANSWER-
2Br- -->Br2 + 2e
In the electrolysis of molten lead bromide what happens to the lead ions? - ANSWER- They
are attracted to the cathode (because they are positive) and gain two electrons to become lead
atoms and sink to the bottom of the beaker
In the electrolysis of molten lead bromide what happens to the bromide ions? - ANSWER-
They are attracted to the anode (because they are negative) and lose two electrons to become
bromine molecules. brown bromine gas forms at the top of the anode.
What is an electric current? - ANSWER- The flow of electrons or ions
What is a covalent bond? - ANSWER- a shared pair of electrons
Why can't covalent compounds conduct electricity? - ANSWER- Because a covalent
compound leaves no spare electrons in the outer shell so there are no free electrons to carry the
current
What is an ionic bond? - ANSWER- when an atom loses or gains electrons to form charged
particles
Why can ionic compounds only conduct electricity when molten or in a solution - ANSWER-
an ionic compound in solid state forms a lattice so the ions aren't free to move around. when they
are dissolved or melted the ions separate and are free to carry electrical currents
What is electrolysis? - ANSWER- passing an electric current through an ionic substance that's
molten or in a solution and breaks it down into new substances
What is electrolysis used for? - ANSWER- To make new substances
WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.
In the electrolysis of molten lead bromide what is the half equation for the Br- ions? - ANSWER-
2Br- -->Br2 + 2e
In the electrolysis of molten lead bromide what happens to the lead ions? - ANSWER- They
are attracted to the cathode (because they are positive) and gain two electrons to become lead
atoms and sink to the bottom of the beaker
In the electrolysis of molten lead bromide what happens to the bromide ions? - ANSWER-
They are attracted to the anode (because they are negative) and lose two electrons to become
bromine molecules. brown bromine gas forms at the top of the anode.
What is an electric current? - ANSWER- The flow of electrons or ions
What is a covalent bond? - ANSWER- a shared pair of electrons
Why can't covalent compounds conduct electricity? - ANSWER- Because a covalent
compound leaves no spare electrons in the outer shell so there are no free electrons to carry the
current
What is an ionic bond? - ANSWER- when an atom loses or gains electrons to form charged
particles
Why can ionic compounds only conduct electricity when molten or in a solution - ANSWER-
an ionic compound in solid state forms a lattice so the ions aren't free to move around. when they
are dissolved or melted the ions separate and are free to carry electrical currents
What is electrolysis? - ANSWER- passing an electric current through an ionic substance that's
molten or in a solution and breaks it down into new substances
What is electrolysis used for? - ANSWER- To make new substances
