What does a half equation represent in electrolysis?
The change to one ion or atom at a single electrode, including the electrons gained or lost.
AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher · 5.4.3.1
Revise AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher specification point 5.4.3.1, The process of electrolysis, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What does a half equation represent in electrolysis?
The change to one ion or atom at a single electrode, including the electrons gained or lost.
When completing or balancing a half equation, what two things must be balanced?
Atoms and charge.
During electrolysis, what happens at the cathode and at the anode?
What is electrolysis?
The decomposition of an electrolyte by passing an electric current through it.
During electrolysis, which electrodes attract positive and negative ions?
What happens when ions are discharged at electrodes during electrolysis?
They gain or lose electrons, forming elements.
What condition must the ions in an ionic substance meet for electrolysis to occur?
They must be free to move.
What is an electrolyte?
A liquid or solution containing free-moving ions that allow it to conduct electricity.
Why does a solid ionic compound not conduct electricity?
Its ions are fixed in the lattice and cannot move.
Why can an ionic compound conduct electricity when molten or dissolved in water?
Its ions are free to move and carry charge through the liquid or solution.