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Y11 chemistry CC10/11 Electrolysis Equilibrium
Game Code: 687753
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Electrolysis and Equlibrium
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Which is the negative electrode? Which ions migrate to it?
Cathode, Cation
10
State the charge of the electrode where oxidation takes place.
Positive
10
What is meant by the degree of dissociation?
It is the extent to which an electrolyte breaks up into ions
15
Explain how OH- ion yields oxygen gas at the anode.
4 OH- ons lose an electron each and give 2 molecules of water and one molecule of oxygen
15
State the entire electro-chemical series of metals in proper order.
K, Ca, Na, Mg, Al, Zn, Fe, Pb, [H], Cu, Hg, Ag
20
Metals which ionize most readily are at the ________ of the series. [top / bottom]
top
5
Why is pure water a non-electrolyte?
Because contains only molecules and not ions to conduct electricity
10
Mention any two conditions for electroplating [with reasons]
To be discussed
20
Why are articles electroplated? [two reasons]
To prevent corrosion and to make them attractive
10
What is electroplating?
Electroplating is the electrolytic process of deposition of a superior metal on the surface of a baser metal or article.
10
Name the electrode that diminishes during electroplating.
Anode
5
Define electrode
a negatively charged particle
chemical decomposition produced by passing electric current
rod of metal/graphite which carries current in/out solution
a positively charged metal
15
electrolysis can only occur in
any of the other choices
solutions or liquids
solids
gases
15
Explain why ionic solids cannot be electrolysed
ions cannot move around in a solid (when electrolysis occurs ions need to move to electrodes)
20
What type of ion is Fe2+
cation
10
What type of ion is F-?
anion
10
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