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WorksheetsElectrochemistry
Total questions: 30
Worksheet time: 3hrs 25mins
As an element is oxidized, its oxidation number
decreases as electrons are lost
increases as electrons are lost
decreases as electrons are gained
increases as electrons are gained
The reaction 2NaCl → 2Na + Cl2 is an example of
a reduction reaction, only
both an oxidation and reduction reaction
an oxidation reaction, only
neither an oxidation nor a reduction reaction
Oxidation-reduction reactions occur because of the competition between particles for
electrons
positrons
protons
neutrons
Mg + PbCl2 → MgCl2 + Pb
Which statement correctly describes the oxidation and reduction that occur?
Mg is oxidized and Pb+2 is reduced
Mg is oxidized and Cl- is reduced
Mg is reduced and Cl- is oxidized
Mg is reduced and Pb+2 is oxidized
In the reactions
Sn+2 + 2Fe+3 --> Sn+4 + 2Fe+2,
the reducing agent is
Fe+3
Sn+2
Sn+4
Fe+2
Pb + 2Ag+ → Pb+2 + 2Ag
The chemical species being reduced is
Ag
Pb
Pb+2
Ag+
In the reactions
Sn+2 + 2Fe+3 → Sn+4 + 2Fe+2
the oxidizing agent is
Sn+4
Sn+2
Fe+3
Fe+2
An electrolytic cell uses electrical energy to drive
chemical reaction
physical reaction
no reaction
none of above
Galvanic cells convert
mechanical energy in to electrical energy
potential energy in to electrical energy
electrical energy in to chemical energy
chemical energy in to electrical energy
In electrolysis, particles which move towards cathode are called
anions
cations
photons
positrons
What is a half-reaction?
It is a reaction at equilibrium where half of the substances are reactants and half of the substances are products.
It is the reaction that occurs when the switch of a galvanic cell is open.
It shows EITHER the reduction component or the oxidation component of a redox reaction.
It shows BOTH the reduction and oxidation components of a redox reaction.
What is an anode?
It is the electrode where oxidation takes place.
It is the electrode where reduction takes place.
It is an aqueous solution containing an electrode.
It is the salt bridge that connects half-cells.
What is a cathode?
It is the electrode where oxidation takes place.
It is the electrode where reduction takes place.
It is an aqueous solution containing an electrode.
It is the salt bridge that connects half-cells.
Electrons always flow from
cathode to anode
anode to cathode
Oxidation occurs at the
anode
cathode
Electrons are gained at the
anode
cathode
Which metal is the negative electrode?
Zn/Zn2+ // Cu2+/Cu
zinc
copper
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
which element, if any, is oxidized?
