Leaving Cert Chemistry - Additional Electrochemistry (Ordinary Level)

Multiple Choice Quiz

There are 20 questions in this multiple choice quiz.
You may attempt this quiz as often as you wish.
Each time, you will be given a different set of questions.
Good luck!

The electrochemical series is a list of elements in the order in which they tend to lose electrons.
From the following select the list which has the elements in decreasing order of reactivity.
1. Potassium, magnesium, silver, gold
2. Magnesium, sodium, silver, copper
3. Potassium, sodium, silver, magnesium
4. Sodium, silver, magnesium, lead
Select two correct statements about the Reactivity Series from the following:
1. The least reactive elements are at the bottom.
2. They lose their electrons less readily as you go down the series.
3. They are all metals.
4. They are in the same order as the Activity Series.
The first known battery constructed with copper and zinc plates was known as a Voltaic Pile. Which one of the following scientists was credited with its discovery.
1. Alessandro Volta
2. Michael Faraday
3. Humphry Davy
4. Luigi Galvani
Which English scientist is credited with discovering a number of metals by passing an electric current through a molten sample of the metal's ore?
1. Humphry Davy
2. Alessandro Volta
3. Luigi Galvani
4. Michael Faraday
Which one of the following metals is least likely to corrode?
1. Copper
2. Magnesium
3. Potassium
4. Lead
5. Iron
Based on its position in the Reactivity Series, aluminium does not corrode as easily as it would be predicted.
Why is this?
1. It forms a thin layer of aluminium oxide on its surface that prevents further corrosion.
2. It is the least dense metal in the Reactivity Series.
3. It has a full outer shell of electrons.
4. It is a very unreactive metal.
Select three factors suggesting why aluminium is very suitable in making windows and doors.
1. Aluminium has a relative low density.
2. Aluminium doesn't corrode easily.
3. Aluminium is a strong metal.
4. Aluminium can be bent easily.
5. Aluminium has a nice colour.
Select three factors which aid the corrosion of iron.
1. Iron in contact with water.
2. Oxygen present around the iron.
3. Presence of salt.
4. Low temperature of iron sample.
Which one of the following, if coated on a metal, would be least likely to prevent corrosion?
1. White spirit
2. Grease
3. Oil
4. Paint
The rusting of iron may be prevented by galvanising.
What is meant by the term 'galvanising'?
1. Coating the iron with zinc.
2. Coating the iron with chromium.
3. Coating the iron with tin.
4. Coating the iron with aluminium.
Which one of the following methods is used to prevent the corrosion of aluminium?
1. Anodising
2. Galvanising
3. Tin plating
4. Chromium plating
Cathodic Protection is a means of preventing iron from rusting.
Which one of the following statements about this method is incorrect?
1. A metal, which is lower than iron in the electrochemical series is connected to the iron.
2. The other metal corrodes first in preference to the iron.
3. This method is also known as 'sacrificial protection'.
4. This method is used to prevent corrosion of ships.
Stainless steel is an alloy consisting of iron and a non-metal.
What is this non-metal?
1. Carbon
2. Sulfur
3. Oxygen
4. Silicon
Which metal is extracted from its ore using the Downs Cell?
1. Sodium
2. Iron
3. Aluminium
4. Chromium
In the Downs Cell, what is mixed with the sodium chloride in order to reduce its melting point?
1. CaCl₂
2. MgCl₂
3. MgO
4. KCl
In the diagram of the Downs Cell shown, name the parts labeled X, Y and Z.
1. X = positive electrode, Y = negative electrode, Z = steel gauze.
2. X = positive electrode, Y = steel gauze, Z = negative electrode.
3. X = negative electrode, Y = positive electrode, Z = steel gauze.
4. X = negative electrode, Y = steel gauze, Z = positive electrode.
What is the function of the steel gauze in the Downs Cell?
1. To prevent the sodium and chlorine coming into contact and reacting.
2. It acts as a catalyst during the process.
3. It is the negative electrode.
4. It removes any impurities from the sodium.
From which ore is aluminium extracted?
1. Bauxite
2. Pyrite
3. Haematite
4. Cryolite
In extracting aluminium, its ore is initially mixed with a hot solution to form sodium aluminate. What is this solution mainly composed of?
1. Sodium hydroxide (NaOH)
2. Sodium carbonate (Na₂CO₃)
3. Sodium chloride (NaCl)
4. Sodium hydrogen carbonate (NaHCO₃)
In the extraction of aluminium, solid impurities settle as a coloured mud. What colour is this mud?
1. Red
2. Brown
3. Black
4. Grey
5. Blue
During the extraction of aluminium, alumina is electrolysed. Before the electrolysis the alumina is mixed with Na₃AlF₆. What is the common name for Na₃AlF₆?
1. Cryolite
2. Dolomite
3. Bauxite
4. Haemotite
During the manufacture of aluminium windows and doors, the aluminium is anodised in sulfuric acid (H₂SO₄). What is the reason for anodising the aluminium?
1. To give the aluminium a thicker coating of oxide.
2. To give the aluminium a more pleasing colour.
3. To soften the aluminium in order to make it easier to shape.
4. To remove impurities from the aluminium.
Which one of the following is not a general property of the transition metals?
1. They form oxides that are soluble in water.
2. They have variable valencies.
3. They are good catalysts.
4. They form coloured ions.
In the blast furnace used for the extraction of iron, what three substances are added at X in the diagram?
1. Iron ore
2. Coke
3. Limestone
4. Slag
5. Silicon oxide
6. Graphite
In extracting iron using the blast furnace shown, what are the processes happening at A, B and C?
1. A = hot gases released, B = hot air enters, C = slag comes out
2. A = hot gases released, B = hot air enters, C = iron comes out
3. A = hot gases enter, B = hot air released, C = slag comes out
4. A = hot gases enters, B = iron comes out, C = slag comes out
In the manufacture of steel, which three of the following statements are correct?
1. Oxygen is blown through the molten iron.
2. Carbon and sulfur impurities are removed from the molten iron.
3. Chromium is added to increase the resistance of steel against corrosion.
4. Vanadium is added to the steel to give it extra hardness.
The electric arc furnace is used to
1. recycle scrap iron.
2. add metals to iron in order to make alloys.
3. make steel structures for building.
4. coat iron in order to stop it corroding.
Which scientist was the first to isolate the elements sodium and potassium in 1807 by passing electricity through sodium hydroxide and potassium hydroxide respectively?
1. Humphry Davy
2. Luigi Galvani
3. Michael Faraday
4. Albert Einstein
Where in Ireland is bauxite purified to produce alumina?
1. Aughinish
2. Drogheda
3. Ringaskiddy
4. Wicklow
Give two reasons why it is preferable to obtain aluminium from recycling rather than extracting it from its ore.
1. Recycled aluminium is cheaper.
2. It reduces waste.
3. It is a purer form of aluminium.
4. Recycled aluminium has greater strength.
What is the function of cryolite (Na₃AlF₆) in the electrolysis of alumina?
1. To lower the melting point of the aluminium oxide.
2. To act as a solvent for the aluminium oxide.
3. It acts an inert electrode during the electrolysis.
4. It reacts with the aluminium oxide to form pure aluminium.
Select two reasons from the following as to why recycling of aluminium metal is important for the protection of the environment.
1. It prevents litter.
2. It saves the energy that would have been used in producing aluminium by electrolysis.
3. Recycled aluminium is easier to shape.
4. Recycling aluminium produces less ozone.
Sodium metal and chlorine gas are extracted from sodium chloride using the Downs cell.
Select a correct use for sodium.
1. Sodium is used in street lighting.
2. Sodium is used as an additive in fuel.
3. Sodium is used in manufacturing margarine.
4. Sodium is used in manufacturing ammonia.
A blast furnace may be used in the extraction of iron from iron ore.
Select four materials that must be added to a blast furnace in operation?
1. Iron ore
2. Coke
3. Limestone
4. Hot air
5. Slag
6. Carbon dioxide
The diagram shows an arrangement for the electrolysis of copper(II) sulfate solution using copper electrodes.
What is the chemical formula for copper(II) sulfate?
1. CuSO₄
2. CuO
3. Cu₂SO₄
4. CuS
The diagram shows an arrangement for the electrolysis of copper(II) sulfate solution using copper electrodes.
What is the colour of copper(II) sulfate?
1. Blue
2. Brown
3. Red
4. Colourless
The diagram shows an arrangement for the electrolysis of copper(II) sulfate solution using copper electrodes.
What change happens to the electrode labelled A during the experiment?
1. It loses mass.
2. Its size increases.
3. Bubbles of hydrogen appear at this electrode.
4. It changes colour to blue.
The diagram shows an arrangement for the electrolysis of copper(II) sulfate solution using copper electrodes.
If you wished to electroplate a metal object with copper, which of the electrodes, A or B, should be replaced by the object?
1. B
2. A
The diagram shows an arrangement for the electrolysis of copper(II) sulfate solution using copper electrodes.
If you wished to purify a sample of copper, which of the electrodes, A or B, should you replace with the piece of impure copper?
1. A
2. B
The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes.
Which one of the following materials is most suitable for the electrodes?
1. Platinum
2. Iron
3. Copper
4. Zinc
The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes.
What products are formed at the cathode and at the anode.
1. Lead is formed at the cathode, and bromine at the anode.
2. Bromine is formed at the cathode, and lead at the anode.
3. Lead is formed at the cathode, and hydrogen at the anode.
4. Bromine is formed at the cathode, and oxygen at the anode.
The diagram shows the electrolysis of molten lead bromide (PbBr₂) using inert electrodes.
Why should this electrolysis be carried out in a fume cupboard?
1. The bromine fumes are poisonous.
2. Lead gives off poisonous fumes.
3. Both products react violently with oxygen in the air.
4. Bromine reacts with the electrodes to release a poisonous gas.
Name the pictured English chemist who coined the terms electrode, electrolysis, anode and cathode in 1832.
1. Michael Faraday
2. Isaac Newton
3. Ernest Rutherford
4. Joseph Priestley
Steel, an alloy of iron, is extracted from scrap (containing iron and/or steel) in a special furnace which is illustrated in the diagram on the right.
Name the process involved.
1. Electric arc process
2. Contact process
3. Haber Process
4. Electrolysis
Steel, an alloy of iron, is extracted from scrap (containing iron and/or steel) in a special furnace which is illustrated in the diagram on the right.
From what material are the electrodes A made?
1. Graphite
2. Steel
3. Copper
4. Silicon
Steel, an alloy of iron, is extracted from scrap (containing iron and/or steel) in a special furnace which is illustrated in the diagram on the right.
What is the non-metallic element present in steel at concentrations generally less that 1.7%?
1. Carbon
2. Copper
3. Silver
4. Aluminium
Steel, an alloy of iron, is extracted from scrap (containing iron and/or steel) in a special furnace which is illustrated in the diagram on the right.
Select two two uses of steel from the following list.
1. Construction
2. Ship building
3. Electronics industry
4. Manufacture of margarine
Who is the English scientist, pictured on the right, who isolated the elements sodium and potassium in the early 1800s.
1. Humphry Davy
2. Michael Faraday
3. Isaac Newton
4. Stephen Hawkin
What technique did Humphry Davy use to isolate sodium and potassium?
1. Electrolysis
2. Titration
3. Combustion
4. Dilution
Iron can be isolated from its ores in a blast furnace.
Explain why sodium cannot be extracted in a similar way.
1. Sodium is far too reactive.
2. It has a low density.
3. Sodium has a very high melting point.
4. Heating has no effect on sodium.
How is iron galvanised?
1. It is coated with zinc.
2. It is dipped in a solution of copper sulfate.
3. It is covered with a coat of paint.
4. Carbon is mixed with it.
How does galvanising protect iron from corrosion?
1. It excludes air and water.
2. It forms an oxide layer on its surface.
3. Iron is more easily oxidised.
4. Galvanising removes impurities from iron.