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Combined Science: Chemistry

GCSE · Edexcel · foundation

QuestionsFlashcards

Obtaining & Using Metals
Reversible Reactions & Equilibria
- Reversible Reactions & Equilibrium
  3
- The Haber Process
  4

Group 1
- Group 1 (Alkali Metals)
  4
- Group 1: Reactivity & Electronic Configurations
  4
Group 7
Group 0

Electrolysis Flashcards

All 6 cards in this deck

What is an electrolyte?: An ionic compound that is molten or dissolved in water, so that its ions are free to move.
What is meant by the term electrolysis?: Using electrical energy from a direct current supply to decompose (break down) an electrolyte, i.e. an ionic compound.
During electrolysis, which electrode does each type of ion move to?: Positive ions (cations) move to the cathode, the negative electrode; negative ions (anions) move to the anode, the positive electrode.
True or false? Solid sodium chloride conducts electricity.: False. Its ions are held in a lattice and cannot move, so no current flows; it conducts only when molten or dissolved in water.
Give two reasons why graphite is a suitable material for electrodes in electrolysis.: It conducts electricity, and it is inert so it does not react with the electrolyte or the products.
True or false? Calcium nitrate mixed with water behaves as an electrolyte, but calcium carbonate mixed with water does not.: True. Calcium nitrate dissolves so its ions are free to move; calcium carbonate is insoluble, so its ions stay fixed in the solid.