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16 Cards in this Set
- Front
- Back
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What is an Alloy? |
A metal made from a mixture of metals to attain specific properties. |
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Why are alloys used over pure metals? |
Pure metals are too soft, as they are arranged in layers that can slide over each other. |
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Why are alloys harder than pure metals? |
Differing sizes of metal atoms disrupt the layers of the lattice structure, meaning it is harder for them to slide over each other. |
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What is Steel made of? |
An alloy structure of iron and some carbon. |
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How is Iron obtained in a blast furnace? |
An Iron ore, carbon and limestone are put in the blast furnace. Carbon is more reactive than Iron, so replaces the iron in iron oxide to form CO2 The Iron Oxide is reduced to Iron, and the Carbon is oxidised to CO2. |
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Why can't iron from a blast furnace be used? |
It contains impurities, making it very brittle |
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why is iron from a blast furnace brittle? |
the atoms that make the impurities are different sizes to the iron atoms. this disrupts and distorts the layers of iron atoms, meaning they cannot slide over each other. |
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Why is pure iron impractical to use? |
It is very malleable but too soft. |
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What is the relationship between the carbon content of steel and its strength? |
High cabron content means the steel is stronger, as there are more disruptions in the layers of iron atoms. Low carbon content means the steel is soft and easily shaped, as there are less distortions and disruptions. |
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Why is stainless steel resistant to corrosion? |
Stainless steel is an alloy metal. This alloy contains chromium and nickel, which are elements resistant to corrosion. |
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Name 4 Properties of Aluminium |
Strong Low Density Good conductor of electricity Resistant to corrosion |
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Name 4 properties of Copper |
Good conductor of electricity Resistant to corrosion easily shaped (malleable) flexible |
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Name 4 properties of gold |
shiny very resistant to corrosion soft easily shaped |
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what are 3 uses of aluminium |
lightweight structures
air crafts
drink cans
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2 uses of copper |
electrical wiring
water pipes |
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2 uses of steel |
large structures heavy duty engineering ie bridges trains cars |
