Metals and alloys - C2c

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  • Created by: iram_f
  • Created on: 23-11-14 11:35
What are the half equations and where do they take place?
The half equation for reduction is Cu+2 + 2e- = Cu, as electrons are gained - this occurs at the cathode as pure copper is plated onto it. Cu - 2e- = Cu+2, an example of oxidation as electrons are lost; this occurs at the anode, thus dissolving it.
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What are some alloys, their uses and what properties do they have?
Bronze is made of copper and tin, yet it is harder than copper so can be used to make ploughshares or to cast statues (as it shrinks when it solidifies). Solder, a combination of lead and tin, has a very low m. p. making it ideal to join metals.
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What are the pros and cons of recycling copper?
Recycling saves natural resources as well as saving energy, which would be used to purify it. However it is difficult to persuade people to recycle, and separating the copper from impure copper/other metals is time-consuming.
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How do we purify copper?
We use electrolysis, the break-up of a compound using an electric current, to purify copper. Impure copper dissolves at the +anode (loses mass) and pure copper is plated at the -cathode (gains mass), with copper sulfate solution as the electrolyte.
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What are smart alloys?
Smart alloys have the property of 'shape memory' meaning that they can change and revert back to their shapes at different temperatures. Nitinol is a popular smart alloy used for glasses frames, since it is flexible but strong.
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Other cards in this set

Card 2

Front

What are some alloys, their uses and what properties do they have?

Back

Bronze is made of copper and tin, yet it is harder than copper so can be used to make ploughshares or to cast statues (as it shrinks when it solidifies). Solder, a combination of lead and tin, has a very low m. p. making it ideal to join metals.

Card 3

Front

What are the pros and cons of recycling copper?

Back

Preview of the front of card 3

Card 4

Front

How do we purify copper?

Back

Preview of the front of card 4

Card 5

Front

What are smart alloys?

Back

Preview of the front of card 5

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