Questão 1
Questão
Oxidation is the ______ of electrons
Questão 2
Questão
Which is the correct short-hand notation for a cell?
Responda
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Anode Half-cell | Cathode Electrolyte || Anode Electrolyte | Cathode Half-cell
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Anode Half-cell | Anode Electrolyte || Cathode Electrolyte | Cathode Half-cell
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Cathode Half-cell | Cathode Electrolyte || Anode Electrolyte | Anode Half-cell
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Cathode Half-cell || Anode Electrolyte | Cathode Electrolyte || Anode Half-cell
Questão 3
Questão
In the following equation, Copper is oxidised:
Zn + CuSO4 -> ZnSO4 + Cu
Questão 4
Questão
What is cathodic protection?
Responda
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Electrons are forced back into the metal to prevent corrosion
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Metals are combined to form an alloy which forms an oxide layer
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Metal is covered in a layer of a non-corrosive metal
Questão 5
Questão
Corrosion will occur when two ________ are in contact
Responda
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Dissimilar metals
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Similar metals
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Metals
Questão 6
Questão
Standard conditions for electrochemical reactions are:
25 degrees Celsius;
[all ions] = 1M;
P for all gases = 101.3kPa
Questão 7
Questão
A negative Ecell value means that the reaction is spontaneous
Questão 8
Questão
The higher the reduction potential, the more a metal will want to change into a solid state of matter
Questão 9
Questão
If Cd and Fe reacted, what would the final reaction be, and what would the Ecell value be?
[Cd(2+) + 2e- -> Cd = -0.40V]
[Fe(2+) +2e- -> Fe = -0.45V]
Responda
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Fe(2+)(aq) + Cd(s) -> Fe(s) + Cd(2+)(aq) = -0.05V
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Fe(2+)(aq) + Cd(s) -> Fe(s) + Cd(2+)(aq) = +0.05V
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Fe(s) + Cd(2+)(aq) -> Fe(2+)(aq) + Cd(s) = +0.05V
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Fe(s) + Cd(2+)(aq) -> Fe(2+)(aq) + Cd(s) = -0.05V
Questão 10
Questão
Why doesn't aluminium (Al) corrode under standard conditions?
Responda
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It forms an oxide layer of 2 aluminium atoms and 3 oxygen atoms
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It has a negative oxidation potential and therefore does not corrode spontaneously
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It forms an oxide layer of 1 aluminium atom and 1 oxygen atom
Questão 11
Questão
Which of the following do not corrode spontaneously?
Responda
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Iron (Fe)
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Gold (Au)
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Platinum (Pt)
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Silver (Ag)
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Zinc (Zn)
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Copper (Cu)
Questão 12
Questão
In what direction do electrons spontaneously flow?
Responda
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Negative to positive
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Positive to negative
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Cathode to anode
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Anode to cathode
Questão 13
Questão
What is the oxidation number of Oxygen in Hydrogen Peroxide?
Questão 14
Questão
What is the oxidation number of Hydrogen in LiH?
Questão 15
Questão
In a galvanic cell, what is an observation made about the cathode?
Questão 16
Questão
What does a salt bridge do?
Responda
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Allows the migration of ions to solutions
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Allows the migration of electrons to solutions
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Allows the migration of atoms to solutions
Questão 17
Questão
The reason a salt bridge is needed is to ensure that the solutions are not becoming too positive or negative
Questão 18
Questão
What is the charge of Phosphorus in the Phosphate ion?
Questão 19
Questão
What is the charge of Sulfur in the Sulfate ion?
Questão 20
Questão
What is the charge of Chromium in the Dichromate ion?
Questão 21
Questão
What is the reducing agent in a redox reaction between zinc and a silver nitrate solution?
Responda
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Zinc
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Silver
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Nitrate ions
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Zinc ions
Questão 22
Questão
What is the oxidation of iron (II) ions to iron (III) ions by dichromate to Cr (III) ions in acidic solution? (Open in full-screen to view answers properly)
Questão 23
Questão
In a reaction with Zinc and Copper Sulfate to Zinc Sulfate and Copper, the copper is reduced.
Questão 24
Questão
A reaction with Iron and Copper Sulfate to Copper and Iron Sulphate is spontaneous.
Questão 25
Questão
The following equation is balanced as acidic, how would this be different if balanced as basic? (Open in full-screen to view answers properly)
Questão 26
Questão
An atom with a high electronegativity will want to be...
Questão 27
Questão
What is the electrode potential for the following reaction?
Questão 28
Questão
According to the voltaic cell seen, which metal ion will move to the cathode and be reduced?
Responda
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Zinc
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Magnesium
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Copper (II)
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Copper (I)
Questão 29
Questão
If the following is balanced in an acidic solution, what is the coefficient in front of the nitrate ions?
Questão 30
Questão
If the following cell was created with the initial mass of the Pb electrode as 15.62g and the initial mass of the Fe electrode as 10.70g (with the deposit on the cathode having a mass of 0.938g); what would be the final mass of the Fe electrode and what would be the final concentration of the Fe (II) ion solution?
Responda
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Final mass 10.45g; concentration 0.11M
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Final mass 0.11g; concentration 10.45M
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Final mass 8.35g; concentration 0.64M
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Final mass 5.28g; concentration 1.22M
Questão 31
Questão
If the following cell was created in a 250mL solution of 0.5mol/L with the initial mass of the Cu electrode as 23.62g and the initial mass of the Zn electrode as 18.94g (with the deposit on the cathode having a mass of 1.426g); what would be the final mass of the Zn electrode and what would be the final concentration of the Zn (II) ion solution?
Responda
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Final mass 17.47g; 0.59M
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Final mass 14.34g; 0.48M
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Final mass 12.62g; 1.48M
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Final mass 18.01g; 1.02M
Questão 32
Questão
If the following cell was created with the initial mass of the Cu electrode as 15.00g and the final mass of the Zn electrode as 12.00g (with the deposit on the cathode having a mass of 1.00g); what would be the initial mass of the Zn electrode?
Responda
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13.03g
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14.63g
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12.83g
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13.85g