Flashcards
C1 3.1 Extracting metals
Cards in this deck (43)
- 1What do Ores contain?Metals which can be extracted, purified and sold.
- 2How are metals which are more reactive than carbon extracted e.g. Aluminium?They are extracted using electrolysis of a metal compound.
- 3Why can electrolysis sometimes not be financially feasible?Sometimes the process of extracting the metal can be more than the metal can be sold for. They can also use a lot of energy and time.
- 4What other ways can we extract metals?Using processes such as bioleaching, phytomining. These methods can sometimes be cheaper than electrolysis.
- 5Why are we encouraged to recycle metals?Because the processes used to extract metals can be expensive, time consuming and can have negative effects on the environment.
- 6What is an ore?It's a naturally occurring rock which is chemically combined with oxygen and impurities.
- 7What happens when we concentrate a metal ore?We take away some of the impurities, this ensures that the ore itself will have more metal concentrated inside.
- 8What happens when the demand for a metal increases?The prices for extracting and selling the metal changes.
- 9Write the word equation for this symbol equation: 2CuO+C= 2Cu+Co2Copper oxide+carbon= copper+carbon dioxide
Copper oxide is black and reduces to make copper.
Carbon oxidizes to make carbon dioxide. - 10What is steel?Steel is an alloy which is mixed with other metals so that we can change the properties of the steel.
- 11Why is iron from a blast furnace brittle?Because it contains mainly carbon and 96% impurities and carbon. It's not very useful because it's too soft.
- 12Why are low-alloy steels expensive?Because they contain 1-5% of other metals.
- 13What determines which method we use to extract a metal?The place of the metal in the reactivate series. More reactive metals such as carbon displace less reactive metals from their oxides.
- 14What is copper found as?Copper sulphide christals.
- 15Why is electrolysis of copper not worth the effort nowadays?Because ore's only contain 1% copper.
- 16What metal ore can copper be extracted from?Malachite.
- 17Extracting copper from malachite equation. H2SO+CuO=CUSO4+H20Sulphuric acid+copper oxide=copper sulphate+water.
- 18Equation for malachite.CuCO3=CuO+C02
- 19What is copper used for?Water pipes and electrical wiring.
- 20What is phytomining?Using special plants to absorb the metals from soil as they grow.
- 21What is bioleaching?Using bacteria to eat the cu ions from the rock.
- 22What is the displacement reaction for copper?Copper sulphate+iron= iron sulphate+copper.
- 23What is reduction?The process of removing oxygen.
- 24What is oxidization?This is gaining oxygen.
- 25What is a thermit reaction used for?Molten iron is produced to weld two railway lines together.
- 26What property does both Aluminium and Titanium share?They don't corrode.
- 27Name some properties of Al (aluminium)?Shiny, silvery and a good conductor of energy and electricity.
- 28Al reacts with oxygen and this creates a thin layer of what, to stop the corrosion on the metal?Al2O3
- 29Name some items which Al is used to make?Cans, cooking foil, electricity cables.
- 30Why can gold be found in it's native state?Because it's a less reactive metal.
- 31When is electrolyte used?When doing electrolysis.
- 32What is the name of the positive electrode?Anode
- 33What is the name of the negative electrode?Cathode.
- 34Definition native state?When a metal is found chemically uncombined in nature.
- 35What is a smart alloy?An alloy which is able to be bent and deformed and then have the ability to bend back into shape.
- 36Why is Al difficult to extract?Because it's a more reactive metal which is combined with clay and rock. Al ore is called bauxite.
- 37What does cryolite do?It is another Al ore and it is used to lower the melting point when using electrolysis to extract Al from bauxite.
- 38How do we extract iron from the iron ore?By reducing it using carbon in the blast furnace.
- 39How is copper obtained from copper rich ores?By using the method of smelting, this is when you heat copper in a blast furnace with air which will produce crude copper.
- 40If a metal is below carbon in the reactivate series what method is used to extract the metal?You can use a displacement reaction to take away the oxygen and by doing this you will create the gas carbon dioxide.
- 41If a metal is above carbon in the reactivity series what method can you use to extract the metal?Electrolysis.
- 42What is smelting?Heating an ore in a large furnace.
- 43During electrolysis what happens to the positive copper electrodes?They become attracted to the negative copper electrode.
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- Flashcards on C1 3.1 Extracting metals, created by Zara Kanani on 12/10/2014.
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- Zara Kanani
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