15041062
Description
Quiz by Jeffrey Piggott, updated more than 1 year ago
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Created by Jeffrey Piggott
about 6 years ago
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Question 1
Question
An electrolysis reaction is :
Answer
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a redox reaction that can be used as a source of electrical energy.
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an exothermic redox reaction powered by an external power supply.
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an endothermic redox reaction powered by an external power supply.
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used to produce electrical energy to power many small appliances.
Question 2
Question
In electrolytic cells ...
Answer
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inert electrodes must be used.
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the polarity of the electrodes is determined by the reactants.
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oxidation occurs at the anode and the anode is positive.
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reduction occurs at the cathode and the cathode is positive.
Question 3
Question
Electroplating is used to ...
Answer
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always produce a cheaper metal article.
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apply an even, thin layer of one metal over another metal.
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apply a coating of a metal that is normally too reactive to use commercially.
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apply a coating of a cheap metal to protect an expensive metal.
Question 4
Question
The electrical energy required to produce one kilogram of metal in an electrolytic cell ...
Answer
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will depend only on the oxidation state of the metal ion.
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will be the same for any metal.
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will be the same for any metal with the same oxidation state.
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will differ for each metal.
Question 5
Question
48000 coulombs of charge are required to deposit one-sixth of a mole of a metal. The metal is most likely to be ...
Answer
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Al
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Na
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Mg
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Ca
Question 6
Question
Some metals can only be extracted electrolytically from molten electrolytes. Whether a molten electrolyte is required is determined by ...
Answer
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the economics of the process.
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the charge on the metal ion.
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the oxidant strength of the metal ion compared to the reactivity of water.
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the type of metal salt available.
Question 7
Question
The overall equation for an electrolytic cell is:
2H2O(l) + 2Br−(aq) --> Br2(l) + H2(g) + 2OH−(aq)
While this reaction is occurring ...
Answer
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a thick layer of bromine would deposit on the positive electrode.
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a gas would be evolved at the positive electrode.
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a gas would evolve from one electrode while a brown liquid forms at the other electrode
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a gas would be evolved at both electrodes.
Question 8
Question
The overall equation for a particular electrolytic cell is shown at the left:
The commercial products possible from this cell would be ...
Image:
Q8 (binary/octet-stream)
Answer
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chlorine gas and sodium metal.
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chlorine gas and hydrochloric acid.
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water and chlorine gas.
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chlorine gas, hydrogen gas and sodium hydroxide solution
Question 9
Question
An electroplating bath is used to plate a uniform layer of silver metal of thickness 0.100 mm onto an object of total surface area 300 cm2. Given that the density of silver is 10.5 g cm^−3, the length of time a current of 2.00 A would need to be passed through the cell to plate the object would be close to ...
Answer
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2 hours.
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4 hours
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3 hours
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5 hours
Question 10
Question
The number 96500 is used in many electrolysis calculations.
This number is ...
Answer
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the number of electrons in one mole.
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the mass of one mole of electrons.
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obtained by multiplying the mass of an electron by the charge on an electron
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the charge on one mole of electrons.
Question 11
Question
A current of 1.85 A was passed through a solution containing X2+(aq) ions for precisely 5.00 minutes. 0.169 g of metallic X was deposited on the inert platinum cathode over this time. Metal X is most likely to be ...
Answer
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Ni
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Zn
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Cu
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Sn
Question 12
Question
Iron can be galvanised (coated with zinc) using an electrolytic process. The maximum mass of zinc which could be deposited on a corrugated iron cathode in 2 hours using a current of 500 amperes would be ...
Answer
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3.2 kg.
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2.4 kg.
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4.8 kg.
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1.2 kg.
Question 13
Question
During the production of aluminium using the Hall-Heroult electrolytic cell, both the anode and cathode are made of carbon, but the carbon only takes part in the reaction at one electrode. Which of the following correctly identifies the reactive carbon electrode, and the product produced at it during the electrolysis?
Answer
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anode, aluminium
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cathode, carbon dioxide
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cathode, aluminium
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anode, carbon dioxide
Question 14
Question
When determining Avogadro's constant using the electrolysis of a nickel chloride solution, which of the following values is not required?
Answer
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The total charge used in the electrolysis.
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The voltage used.
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The charge on one electron.
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The mass of nickel depositied.
Question 15
Question
The products formed at the inert electrodes during the electrolysis of a 1.0 M magnesium iodide solution are ...
Answer
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magnesium and iodine.
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magnesium, hydronium ion and oxygen.
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hydrogen, hydroxide ion and iodine
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hydrogen, hydroxide ion, hydronium ion and oxygen
Question 16
Question
In an electroplating cell, a metal ring was to be electroplated with silver. A current of 0.300 A was used to deposit 6.50 mg of silver onto the ring from a silver nitrate solution. The time required to electroplate the ring with silver was close to
Answer
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20 s.
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40 s.
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50 s.
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10 s.
Question 17
Question
When the electrochemical series is used to predict the products of an electrolytic cell reaction ...
Answer
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the predicted products may not match the actual products because no indication of reaction rate is obtained from the series.
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the predicted products will always match the actual products.
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the predicted products will not match the actual products unless the standard hydrogen half-cell is one of the half-cells used.
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the predicted products will always match the actual products if standard conditions are used
Question 18
Question
The product that would be formed at the graphite anode during the electrolysis of a concentrated aqueous solution of potassium chloride would be ...
Answer
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oxygen gas.
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chlorine gas.
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potassium
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hydrogen gas
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