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Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
Redox= quiz part 2 with answers
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Redox= quiz part 2 with answers

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  • 1.  
  • 2.  
  • 3.  
  • 4.  
  • 5.  
  • 6.  
  • 7.  
  • 8.  
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  • 11.  
  • 12.  
  • 13.  
  • 14.  
  • 15.  
  • 16.  
  • 17.  
  • 18.  
  • 19. Why does the surface of the iron in the middle of water droplet serves as the anode?
    • Anode is area where electron is
    • ………………………………
    • Atom ……………………here ……………………………electron to form
    • ………………………… ..
  • 20.
    • Fe  Fe 2+ + 2e
    Write half equation for the reaction at (i) above
  • 21. The electrons released by the iron flows to the edge of the water where there is plenty of dissolved oxygen. Why does the iron surface here serve as the cathode?
    • Cathode is area where electron is
    • ………………………………
    • …………………………… ..…and ……………………….
    • here …………….. electron to
    • form ………………………
  • 22.
    • 2H 2 O + 4e + O 2  4OH -
    Write half equation for the reaction at (iii) above
  • 23.
    • 2H 2 O + 4e + O 2  4OH -
    The iron(II) ions formed in (i) combined with the hydroxide ions formed in (iii) to form iron(II) hydroxide. Write the equation for the reaction here
    • Fe  Fe 2+ + 2e
    Fe 2+ +2OH -  Fe(OH) 2
  • 24.
    • Fe 2 O 3 .xH 2 O
    The iron(II) hydroxide is rapidly oxidized by air to form rust. Write formula of rust
  • 25. Draw simple diagram of mechanism of rusting
  • 26. Method of metals extraction
    • Aluminium=electrolysis of molten aluminium oxide
    • Iron= heat iron oxide with carbon
    • Copper= heat copper(II) sulphide strongly in air
    • Gold= unreactive metal= obtained free
  • 27. What kind of metals A) prevent rusting and B) encourage rusting
    • A) metals above iron in ECS
    • B) metals below iron in ECS
  • 28. ECS and RS
    • K
    • Na
    • Ca
    • Mg
    • Al
    • Zn
    • Fe
    • Sn
    • Pb
    • Cu
    • Hg
    • Ag
    • Au
    (RS) C (RS) H H (ECS)
  • 29. Differences between electrolytic cell and voltaic/chemical cell
    • Electrolytic cell
    • Oxidation occur at positive electrode
    • because negative ions
    • released electrons here
    • Chemical cell cell
    • Oxidation occur at negative electrode
    • because metal atom
    • release electrons here
  • 30. Differences between electrolytic cell and voltaic/chemical cell
    • Electrolytic cell
    • Reduction occur at negative electrode
    • because positive ions
    • gain electrons here
    • Chemical cell cell
    • Reduction occur at positive electrode
    • because positive ions
    • gain electrons here

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