Lesson 4.4.3.3
4.4.3.3 Using electrolysis to extract metals Quiz: AQA Chemistry, Unit 4
20 questions
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Lesson 4.4.3.3, Using electrolysis to extract metals: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 4: Chemical changes, written with Revision Ninja.
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The 20 questions
-
Why are certain metals extracted using electrolysis rather than reduction with carbon?
- Too reactive
- Too expensive
- Too heavy
- Too brittle
-
What molten mixture is electrolysed to manufacture aluminium industrially?
- Cryolite and bauxite
- Aluminium oxide and carbon
- Aluminium oxide and cryolite
- Bauxite and molten sulfur
-
What role does the carbon anode play in the extraction of aluminium?
- Insulates heat
- Cools mixture
- Catalyses reaction
- Conducts electricity
-
Why must the carbon anode be continually replaced during aluminium extraction?
- Absorbs aluminium
- Dissolves in cryolite
- Melts away
- Reacts with oxygen
-
What is the purpose of adding cryolite to aluminium oxide in aluminium extraction?
- Increases conductivity
- Lowers melting point
- Stops corrosion
- Purifies aluminium
-
Why is a large amount of energy required for the industrial extraction of aluminium?
- Cooling the metal
- Melting and current
- Purifying the bauxite
- Pressurising the tank
-
Which metal is extracted by electrolysis rather than reduction with carbon?
- Lead
- Aluminium
- Iron
- Copper oxide
-
Which product forms at the cathode in aluminium extraction?
- Oxygen
- Carbon dioxide
- Aluminium
- Fluorine
-
Which product forms at the anode in aluminium extraction?
- Chlorine
- Aluminium
- Hydrogen
- Oxygen
-
Why does metal extraction via electrolysis require more energy than reduction with carbon?
- Electrical energy input
- Higher chemical heat
- Exothermic losses
- Slower reaction rate
-
Which metal is too reactive to be extracted by carbon reduction?
- Copper
- Aluminium
- Lead
- Iron
-
Which metals are typically extracted by reduction with carbon?
- Sodium and aluminium
- Potassium and sodium
- Aluminium and magnesium
- Iron and copper
-
What energy source drives the extraction of metals by electrolysis?
- Light energy only
- Electrical energy
- Gravity
- Chemical heat only
-
What happens to aluminium ions at the cathode during aluminium extraction?
- Lose electrons
- Gain protons
- Gain electrons
- Lose neutrons
-
Why can carbon not extract metals positioned above it in the reactivity series?
- Carbon melts too easily
- Carbon forms no oxides
- Carbon cannot reduce
- Carbon is too soft
-
Sodium is extracted by electrolysis of which compound?
- Sodium carbonate
- Sodium chloride solution
- Molten sodium chloride
- Solid sodium oxide
-
Which product forms at the cathode during electrolysis of molten sodium chloride?
- Sodium
- Oxygen
- Hydrogen
- Chlorine
-
Which compound is melted to extract potassium?
- Molten potassium chloride
- Potassium sulfate powder
- Potassium chloride solution
- Potassium oxide gas
-
The positive electrode must be replaced because it reacts with which gas?
- Oxygen
- Nitrogen
- Hydrogen
- Chlorine
-
What happens to the carbon anode during industrial aluminium extraction?
- It becomes unreactive
- It turns into copper
- It dissolves completely
- It is consumed
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