Flashcards
Chemistry c1 unit 1 continued
Flashcards do conjunto (20)
- 1What is the ionic equation for what happens to aluminium when it reacts with oxygen?Al -> Al3+ +3e-
- 2What is the ionic equation for what happens to oxygen when it reacts with aluminium?O + 2e- -> O2-
- 3What type of ions to metals form?Positive
- 4What is reduction?The removal of oxygen from a compound
- 5What are unreactive metals found in their natural state called?Native metals
- 6What is an ore?A rock containing enough metal to make it economic to extract
- 7What is a displacement reaction?A reaction where a more reactive element 'pushes' a less reactive element out of its compound.
- 8Give two examples of a reduction reaction.C +2CuO -> CO₂ + 2Cu
and
2Fe₂O₃ + 3C -> 4Fe + 3CO₂ - 9How can copper be extracted from its ore using carbon?Displacement reaction:
Carbon + Copper Oxide -> Carbon Dioxide + Copper - 10List the reactivity seriesPotassium
Sodium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Tin
Lead
Copper
Silver
Gold
Platinum - 11What metals can be extracted using carbon?Zinc
Iron
Tin
Lead - 12List some environmental problems caused by mining metal oresScars on the landscape
Damage of habitats
Noise and dust pollution
Machinery emits greenhouse gases
Areas water becomes acidic
Waste rock
Sulphur dioxide from smelting which causes acid rain - 13Explain what Phytomining isPlants are grown on soil that contains too little metal to be used for conventional exploitation but still contains some metal. As the plants grow, they absorb the metal ions in the soil through their roots. The plants are then harvested and burned. The plant ash contains a high concentration of the metal so then the metal can be extracted using electrolysis or a displacement reaction.
- 14What are the advantages of phytomining compared to open cast mining?It doesn't harm the landscape because it doesn't involve digging deep pits and doesn't leave a lot of waste rock. It is also relatively inexpensive and makes use of low grade metal ores.
- 15What are the disadvantages of phytomining compared to open cast mining?It is a long process and carbon dioxide is released when the plants are burned.
The metal produced is often less good because some impurities remain. - 16What are the advantages of recycling metals?Money is saved on extracting metals from their ores
Reduced pollution
Less used of fossil fuels to supply the electricity used in electrolysis
Less pits dug in ground - 17What are the disadvantages of recycling metals?Recycling metals can produce harmful and toxic chemicals which harm the environment.
It can also be time consuming to separate the rubbish in order to recycle them.
and this can cause more problems and money than it's worth. - 18What are the advantages of using metals in construction?Aluminium alloys are corrosion resistant
Good electrical conductors - copper is good for wiring
Malleable - lead is good for sealing joints on roofs
Strong - steel is good for girders - 19What are the disadvantages of using metals in construction?More expensive than concrete
Extraction of metals from their ores causes environmental problems
Iron and steel can rust inside reinforced concrete, causing it to collapse - 20How is iron extracted from its ore?Iron ore (iron oxide) is heated in a blast furnace and a displacement reaction takes place.
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- Studying for GCSE Science (Chemistry) FlashCards sobre Chemistry c1 unit 1 continued, criado por Melissa Quail em 03-10-2014.
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