iGCSE Chemistry: Electrolysis
Terms in this set (33)
All the atoms in group 2 have 2 electrons in their outer shell. What charge ions do they form?
When can ionic substances conduct electricity?
When molten or dissolved
Explain what is meant by electric current
The rate of flow of charged particles (e.g. of electrons or ions)
(Triple only) Draw a diagram to show the bonding in a metal
(Triple only) Describe the bonding in a metal
The strong electrostatic attraction between a regular structure of positive ions and a sea of delocalised electrons
(Triple only) Explain why metals are malleable
Metals have layers of ions that can slide over each other
(Triple only) What does the word malleable mean?
Able to be hammered or pressed into shape without breaking or cracking
(Triple only) State whether covalent susbances conduct electricity, and explain why
No. Because there are no charged particles that are free to move
(Triple only) Why do ionic compounds conduct electricity only when molten or in solution?
When solid the ions are held in place. When molten or in solution the ions are free to move
(Triple only) Are cations positively or negatively charged?
(Triple only) Explain what is meant by electrolysis
The breakdown of a substance using electricity
(Triple only) How could you determine if a liquid is an electrolyte?
Put it in a circuit including a bulb. If the bulb lights then the liquid is an electrolyte
(Triple only) Name the product formed at the anode during the electrolysis of molten copper chloride
(Triple only) Name the product formed at the cathode during the electrolysis of water
(Triple only) What is the name for the negative electrode?
(Triple only) What is the name for the positive electrode?
(Triple only) What type of reaction takes place at the anode?
(Triple only) What type of reaction takes place at the cathode?
(Triple only) In aluminium extraction, what is the ionic half-equation for the reaction at the negative electrode?
Al³⁺ + 3e⁻ → Al
(Triple only) In aluminium extraction, what is the ionic half-equation for the reaction at the positive electrode?
2O²⁻ → O₂ + 4e⁻
(Triple only) In terms of electrons, what is oxidation?
Oxidation is the loss of electrons
(Triple only) In terms of electrons, what is reduction?
Reduction is the gain of electrons
(Triple only) What is the formula of aluminium oxide?
(Triple only) Write ionic half-equations for the reactions at the electrodes in aluminium extraction
Al³⁺ + 3e⁻ → Al and 2O²⁻ → O₂ + 4e⁻
(Triple only) Draw an electrolysis cell used to investigate the electrolysis of aqueous solutions
An experiment investigates which of metals X and Z is more reactive. The result is X + ZSO₄ → X + ZSO₄. Which metal is more reactive?
State the meaning of the term oxidising agent
A substance that gives oxygen or removes electrons (it is itself reduced)
State the meaning of the term redox
A reaction involving both reduction and oxidation
State the meaning of the term reducing agent
A substance that takes oxygen or gives electrons (it is itself oxidised)
(Triple only) In the earth's crust, in what form are most metals usually found?
As an ore: a compound containing the metal
(Triple only) What type of metals might be found in the Earth's crust as uncombined elements (i.e. not as compounds)?
(Triple only) For the extraction of which metals is electrolysis used, and which use the displacement method?
Metals above carbon in the reactivity series are extracted by electrolysis. For those below, displacement is used.
(Triple only) Carbon is less reactive than calcium. What method should be used to extract calcium from its ore?
OTHER SETS BY THIS CREATOR
iGCSE Chemistry: Ionic Bonding
iGCSE Chemistry: Specification Experiments
iGCSE Chemistry: Key Calculations (Triple)
iGCSE Chemistry: Equilibria (Triple)
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