A substance from the ground from which a metal can be economically extracted
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Aluminum oxide
Q.2.
What is the usual method of extracting a reactive metal from its purified ore?
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Electrolysis of the molten ore
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Displacement by carbon
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Pyrolysis
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Filtration
Q.3.
What is the correct order of these sentences which briefly describe the process used to extract a reactive metal like aluminum?Electrodes are placed into the molten ore.The ore is purified and melted.The molten metal can be tapped off and cast into ingots.The metal ions are deposited as molten aluminum.
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1, 2, 4, 3
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2, 1, 4, 3
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3, 2, 1, 4
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4, 3, 1, 2
Q.4.
Why do the ores of reactive metals need to be molten during the extraction process?
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So that they can be stirred
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So that the metal can be poured off the top
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So that more ore can easily be added when metal is removed
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So that the electricity can pass through the ore
Q.5.
During the electrolysis of a reactive metal ore, which electrode attracts the metal ions?
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The neutral electrode
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The cathode
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The anode
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It happens randomly
Q.6.
Why can you not obtain group I and group II metals by heating their oxide with carbon?
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Carbon is more reactive than group I and group II metals
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The ores of group I and group II metals are too strong
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The metals are silver in color but carbon is black
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Carbon is less reactive than the group I and group II metals
Q.7.
Titanium is a stronger and lighter metal than iron. Apart from the fact that iron is more abundant in the Earth's crust, why do we not use it instead?
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It is more easily corroded because it is more reactive than iron
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It is only found in countries that like to keep their resources for themselves rather than exporting them
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It is not malleable or ductile
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Extracting it is an expensive and difficult process
Q.8.
To extract titanium, the ore (titanium dioxide) is converted to titanium chloride which is then reacted with magnesium at 800 C. The magnesium combines with the chloride, leaving the titanium metal on its own. The reaction of magnesium with the titanium chloride is an example of what sort of reaction?
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Neutralisation
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Displacement
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Hydration
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Condensation
Q.9.
What does the displacement reaction of magnesium with the titanium chloride tell you about titanium and magnesium?
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They are non-metals
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Titanium is softer than magnesium
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Titanium is more reactive than magnesium
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Titanium is less reactive than magnesium
Q.10.
Which of the following metals could also be used to displace titanium from its chloride?
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Gold
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Iron
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Aluminium
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Sodium
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