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chemistry

Zara Pratt Inglés 44 fichas

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  1. 1What is corrosion?Corrosion is the gradual destruction of metal by the environment
  2. 2What is rusting?Rusting is the corrosion of iron
  3. 3Why are iron gates or railing painted?To form a protective barrier that prevents water and oxygen from forming rust
  4. 4How do corrosion inhabitors differ from painting, oiling and electroplating in preventing corrosion?They inolve in a CHEMICAL REACTION
  5. 5Explain why fresh aluminium corrodes rapidly at first then stops?Aluminium oxide forms a protective barrier to protect the aluminium underneath. Before forming the aluminium oxide, aluminium reacts with oxygen in the air
  6. 6why is magnesium sometimes attatched to steel shipsMagnesium will corrode becasue it is more reactive
  7. 7What does galavanise mean?Adding a layer of zinc to protect the iron underneath
  8. 8Which group is very unreactive. Why?Noble gases/group 8, they dont need to react to complete a shell- it is allready complete
  9. 9Name group 7 in the periodic tableHalogens
  10. 10Name group 1 in the periodic tableAlkali metals
  11. 11What is a perioda horizontal row in the periodic table
  12. 12What is a groupa vertical column in the periodic table
  13. 13Name another metal that can be used to protect iron from rustingAluminium
  14. 14Why is zinc used to galvanise ironzinc acts as a barrier to the iron, if scratched the zinc will corrode
  15. 15Magnesium blocks on ships have to be replaced at regular intervals,whyThey fully erode instead of eroding the iron ships instead
  16. 16What is smeltingsmelting is the heating of an ore to produce crude copper
  17. 17What is displacementIron is more reactive than copper so it can reduce copperoxide to form iron oxide and copper
  18. 18what is electrolysisuses electricity to separate from a solution of their salts
  19. 19what is phytominingplants absorb the metal compounds
  20. 20what is bioleachingusing bacteria to break down metal ores
  21. 21what does reduction meana metal oxide has its oxygen removed to leavea metal
  22. 22what does displace meanmore reactive metal taking the place of a less reactive metal in a compound
  23. 23iron from a blast furnaceis a mixture becauseit contains element not chemically bonded
  24. 24what does extract meanremove metals from their ores
  25. 25whay are we unable to extract aluminium using carbonbecause aluminium is more reactive than carbon
  26. 26do the group 1 metals get more or less reactive going down the groupthey get more reactive
  27. 27what types of metals are found nativecopper, silver, gold and platinum
  28. 28general equation for group 1 elements with watermetal+water -> metal hydroxide + hydrogen
  29. 29how is pottasium, sodium, calcium, magnesium and aluminium extracted. why cant carbon be used to extract themthey are extracted using electrolysis, carbon is not reactive enoug to displace them
  30. 30what are the 2 main methods of extractionreduction(burning ores with carbon)
    electrlysis(passing electricity through metal)
  31. 31why is carbon used to extract zinc, iron, tin and leadbecause they are less reactive than carbonand cant be found as uncombined elements (native)
  32. 32what does the group number meanhow many electrons there are in the outer shells of the elements
  33. 33what does the period number meanhow many electron shell it has
  34. 34the general equation for the reaction of group 1 elements with oxygenmetal+oxygen->metal oxide
  35. 35general equation for the reaction of group 1 elements with watermetal+water->metal hydroxide+hydrogen
  36. 36what do we call loss of oxygenreduction
  37. 37what is a displacement reactionwhen a more reactive metal takes the place of a less reactive metal in a compound
  38. 38why are we able to extract iron using carbonbecasue carbon is more reactive than iron
  39. 39what do we call the gain of oxygenoxidation
  40. 40explain why copper cannot be used as a sacrificial metal for ironcopper is less reactive than iron
  41. 41most to least reactive zn,cu,k,mgk,mg,zn,cu
  42. 42what is a displacement reactionwhen a more reactive metal displaces a less reactive metal in a compound
  43. 43name group 1 in the periodic tablealkali metals
  44. 44which group is very unreactive. why,noble gases/group 8 they dont need tonreact to completea shell- it is allready complete

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ores, extraction and ect
Creado por
Zara Pratt
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