How can less reactive than carbon metals be extracted from ores?
by reduction with carbon, e.g. iron oxide
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How can metals that are more reactive than carbon be extracted from their ores?
By electrolysis of molten compounds. The use of large amounts of energy in the extraction of these metals makes them expensive.
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How can copper be extracted?
1) smelting 2) by adding sulfuric acid to copper ore, copper then extracted using electrolysis or displacement 3) phytomining 4) bioleaching
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Why should we recycle metals?
because extracting them uses limited resources and is expensive in terms of energy and effects on the environment.
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Iron from the blast furnace contains impurities which....
makes it hard and brittle, can be run into moulds to form cast iron, can be used in stoves and man-hole covers.
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What does steel contain?
Iron and carbon
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Why do we have alloys?
As most pure metals such as copper, iron and aluminium are too soft for many uses.
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What are the elements in the central block of the periodic table known as?
Transition metals - good conductors of heat and electricity and can be bent or hammered into shape.
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Why is copper used for electrical wiring and plumbing?
It's a good conductor of electricity and heat, it can be bent but is hard enough to be used to make pipes or tanks, doesn't react with water.
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Why are aluminium and titanium useful metals?
As they have a low density and high resistance to corrosion.
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What are the benefits of building with metals?
Steel is strong for girders, aluminium is resistant to corrosion, many are malleable, copper is a good conductor and isn't reactive.
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What are the drawbacks of building with metals?
iron and steel can rust, extraction causes pollution, metals are more expensive than other materials like concrete.
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What are the drawbacks of mining?
Scar the landscape, noisy and dusty, destroy animal habitats, large heaps of waste rock, make groundwater acidic, releases gases that cause acid rain.
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what are the benefits of recycling metals?
recycling aluminium saves 95% of energy normally used to extract it, saves money, iron & steel can be easily recycled - they are magnetic so can be separated, copper can be recycled but it's trickier as it's often alloyed with other elements.
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Other cards in this set
Card 2
Front
How can metals that are more reactive than carbon be extracted from their ores?
Back
By electrolysis of molten compounds. The use of large amounts of energy in the extraction of these metals makes them expensive.
Card 3
Front
How can copper be extracted?
Back
Card 4
Front
Why should we recycle metals?
Back
Card 5
Front
Iron from the blast furnace contains impurities which....
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