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Chemistry Topic 4
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- 1Chemistry Topic 4: Metals Spec point 4.1: Where are most metals from and what are they found in? Where are unreactive metals found and as what?Chemistry Topic 4: Metals
Spec point 4.2:
How are most metals extracted from their ores? - 2Chemistry Topic 4: Metals Spec point 4.3: Explain why the method used to extract a metal is related to its position in the reactivity series and the cost of extraction process.Chemistry Topic 4: Metals
Spec point 4.4:
Investigate methods for extracting a metal from its ore. - 3Chemistry Topic 4: Metals Spec point 4.5: Describe oxidation and reduction.Chemistry Topic 4: Metals
Spec point 4.6:
What does the extraction of metals result in? - 4Chemistry Topic 4: Metals Spec point 4.7: What does the oxidation of metals result in?Chemistry Topic 4: Metals
Spec point 4.8:
Describe the relationship between a metal's resistance to corrosion and its position in the reactivity series. - 5Chemistry Topic 4: Metals Spec point 4.9: Discuss recycling of metals.Chemistry Topic 4: Metals
Spec point 4.9:
Discuss recycling of metals. - 6Chemistry Topic 4: Metals Spec point 4.10: Uses of metals.Chemistry Topic 4:Metals
Spec point 4.10:
Uses of metals. - 7Chemistry Topic 4: Metals Spec point 4.11: What is a alloy and what does it do?Chemistry Topic 4: Metals
Spec point 4.12:
What is iron alloyed with and what does this produce? - 8Chemistry Topic 4: Metals Spec point 4.13: What does alloying do to the properties of a metal?Chemistry Topic 4: Metals
Spec point 4.14:
Stents. - 9Most metals are from ores and are found in the Earth's crust. Unreactive metals are found in the Earth as uncombined elements.With the use of either electrolysis or heating it with carbon.
- 10The more reactive the metal, the harder it is to extract therefore electrolysis must be used to extract it. This is more expensive because electricity must be used to extract it, this costs more.Electrolysis and heating it with carbon.
- 11Reduction is the process of removing oxygen from a compound. Oxidation is the process in which oxygen is added to a compound or element.The extraction of metals results in the reduction of ores.
- 12The oxidation of metals result in corrosion.More reactive metals are less resistant to oxidation.
The less reactive metals are very resistant to oxidation. - 13Advantages: -Easy to recycle. -Will not run out. -Ores will last longer -Saves energy and is cheaper -Less waste metals are put in landfill sites. -Less pollution2 Disadvantages:
-Difficult to sort. - 14Aluminium: Cans,foil,pans,air-planes (Low density,strong,good resistance to corrosion and electrical conductivity) Copper:Electrical wiring,pens (Quite low density,strong,good resistance to corrosion, very good electrical conductivity)Gold:Jewellery,fillings,circuit boards
(High density, weak, excellent resistance to corrosion and electrical conductivity)
Silver:Jewellery,cutlery
(Quite high density,weak, very good resistance to corrosion and excellent electrical conductivity - 15An alloy is a mixture of two metals or a metal and a non-metal of different sizes. Using alloys improves the quality of a metal as the smaller atom disrupts the layers of the pure metal and stops them from sliding past each other.Iron is alloyed with other metals such as chromium,nickel or copper to produce a alloy steel. Alloy steels have a better strength and resistance to rust.
- 16It improves it. For example 'smart' alloys such as nitinol which is a mixture of titanium and nickel, these instantly go back their shape once bent.Stents are metal tubes made of nitinol, these are used to unblock arteries blocked with cholesterol and fat. It is placed into a artery and a balloon is put in it then inflated. The balloon is popped leaving the stent and a large space for blood to flow around the body.
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- Karteikarten am Chemistry Topic 4, erstellt von Sara Olukoga am 18/03/2015.
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