Flashcards
Ores
Flashcards do conjunto (20)
- 1What is an ore?A metal ore is a rock which contains enough metal to make it worthwhile extracting the metal
from it. - 2In many cases the ore is the.......... of a metal. Give an example!OXIDE
Example: aluminium ore is called bauxite- its aluminium oxide. -
- 3A metal can be extracted from its ore chemically - by ................ or by ..................... Some ores may have to be ................... before the metal is extracted- this involves getting rid of the unwanted ............ material. ...................... can also be be used to ............... the extracted metal.reduction
electrolysis
concentrated
rocky
electrolysis
purify - 4With what can a metal be extracted chemically?----Reduction using carbon----
When an ore is removed oxygen is removed from it.
- 5the reactivity seriesMetals higher than carbon- electrolysis
Metals lower by reduction.
- 6Why is electrolysis an expensive process?Eg. A high temperature is needed to melt aluminium can be extracted - this requires a lot of energy which makes it an expensive process.
- 7Copper is extracted by .............. with ................ The ore is heated in a .............. this is called ............... However the copper produced is ............ - which does not conduct electricity too well. This is not useful as lot of copper is used to make ..................... ........................ So ..................... is used to ................. it even though it is expensive. This produces a very .......... copper which is a much better ..........................reduction
carbon
furnace
smelting
impure
electrical wiring
electrolysis
purify
pure
conductor - 8—ELECTROLYSIS. Breaking down a substance with electricity. It requires a liquid called electrolyte. Electrolytes are often metal salt solutions made from the ore or molten metal oxides. The electrolyte has free ions- these conduct electricity. Electrons are takeb by the positive anode and given away be the negative cathode.As ions gain or lose electrons they become atoms or molecules are released.
- 9Explain the imageElectrons are pulled off copper atoms at the anode, causing them to go into solution as Cu2+ ions.
Cu2+ ions near the cathode gain electrons and turn back into copper atoms.
The impurities are dropped at the anode as a sludge, whilst pure copper atoms bond to the cathode.
- 10More ................ metals react more ................. than less ................. metals. If you put a .................. metal into a solution of a ..................... ............. ..................................., the reactive metal will ........... the less reactive metal in the ......................reactive
vigorously
reactive
reactive
dissolved metal compound
replace
compound - 11Give an example of a displacement reaction
- 12Method of extracting copper: 1: Bioleaching Describe bioleachingUses bacteria to seperate copper from copper sulfide. Bacteria get energy from bond between copper and sulfur- seperationg the copper from the ore in the process.
The leachate (solution produced by the process) contains copper, which can be extracted eg: by filtering.
- 13Phytomining- Involves growing ..... in ...... that contains ............ Plants cant use or get rid of copper sp it gradually ........ .... in the .......... The plants can be ..............., ............. and .............. in a ............ The copper can be collected from the ..... left in the ..............plants
soil
copper
builds uo
leaves
harvested- dried- (and) burned
furnace
ash
furnace - 14Traditional methods of copper mining are pretty ................. to the ....................... These new methods of extraction have a much smaller ..........., but the disadvantage is that they are ........damaging
environment
impact
slow - 15List three advantages of metal extraction- useful products can be made
- provides local people with jobs and brings money into the area
- Services like transport and health can be improved - 16Why is mining ores bad for the environment?Causes noise, scarring of the landscape and loss of habitats. Deep mine shafts can be dangerous for a long time after the mine has been abandoned.
- 17Recycling metals is important, because ...................... and .............. metals takes a lot of .............. most of which comes from .............. ................. ............... These are ............ ..... so it is important to ............... them. It also contributes to ........... ....... , ................ ................. and ................ ...............mining (and) extracting
energy
burning fossil fuels
running out
conserve
acid rain, global dimming (and) climate change - 18What does the image relate to?Energy does not come cheap- so recycling saves money.
- 19Recycling metals only uses a ......... .......... of the ............. needed to ............ and ............... new ............. . Also there is a ........... ............... of each ............ on Earth. Recyling ................. these resources.small fraction
energy
mine (and) extract
finite amount
metal
conserves - 20—RECYCLING- cuts down amount of rubbish being sent to landfill sites. Landfill takes up space and pollutes the surroundings.
Informações
- Descrição
- Extraction of copper Reacitivity series Displacement reactions Electrolyses Reduction by carbon Advantages and disadvantages of metal extraction Why recycling is important
- Criado por
- murailuca
- Visualizações
- 6
- Avaliação
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