C2c: Metals and Alloys

Metallic elements and alloys have many uses in our society. This item examines how metals are extracted from their ores. It also describes some of the uses of some important alloys including smart alloys.

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How can copper be extracted?
By heating it's ore with carbon.
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What is reduction?
The removal of oxygen from a substance
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Which process purifies copper?
Electrolysis.
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Why is recycling copper cheaper than extracting copper from its ore?
Because is saves resources and uses less energy.
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What are alloys?
Mixtures containing one or more metal elements.
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Name five different alloys.
Brass, bronze, solder, steel and amalgram
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Give a use of amalgram.
Used in tooth fillings
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Give three uses of brass.
Coins, musical instruments and door decorations (door knockers)
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Give a use of solder
Used to join electrical wires
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Are the properties of an alloy the same as the properties of the metal it is made from?
No!
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What are the apparatus needed to purify copper by electrolysis?
pure copper cathode, impure copper anode and copper (II) sulfate solution
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What are two advantages of recycling copper?
It's cheaper, and only uses 15% of the energy that'd be used to mine and extract the same amount
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What are two disadvantages of recycling copper?
It is hard to convince the effort to sort and recycle their metal waste - and even then you have to sort out the copper from all other the waste metal - which takes time and energy.
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What is the main metal in amalgam?
Mercury
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What are the main metals in brass?
Copper and zinc.
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What are the main metals in solder?
Lead and tin.
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Describe the use of electrolysis in the purification of copper.
impure copper as anode, pure copper as cathode, copper(II) sulfate solution as electrolyte, cathode gains mass because copper is deposited and anode loses mass as copper dissolves
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Explain why the electrolytic purification of copper involves both oxidation and reduction
Cu^2+ + 2^e– = Cu - as an example of reduction because electrons are gained and Cu – 2^e– = Cu2^+ as an example of oxidation because electrons are lost.
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Give an example of a use of a smart alloy.
such as those with a shape memory property have increased the number of applications of alloys - nitinol
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What does nitinol consist of?
Nickel and titanium
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What is the use of nitinol?
used to make spectacle frames as the frames will return to their original shape after bending
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Other cards in this set

Card 2

Front

What is reduction?

Back

The removal of oxygen from a substance

Card 3

Front

Which process purifies copper?

Back

Preview of the front of card 3

Card 4

Front

Why is recycling copper cheaper than extracting copper from its ore?

Back

Preview of the front of card 4

Card 5

Front

What are alloys?

Back

Preview of the front of card 5
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