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Chemistry

6th

grade

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Bab 8.0

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14 questions

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  • 1. Multiple Choice
    1 minute
    1 pt
    An electrochemical cell was set up using iron and copper plates in molar solution of Fe2+ (aq) and Cu2+ respectively. Which one is the correct cell diagram represent?
    Fe (s) | Fe2+ (aq) || Cu2+ (aq) | Cu (s)
    Cu (s) | Cu2+ (aq) || Fe2+ (aq) | Fe (s)
  • 2. Multiple Choice
    1 minute
    1 pt
    The standard reduction potential, E°, at 298K for five half-cells are given below. W2+ (aq) + 2e- <=> W (s) -2.38V, X3+ (aq) + 3e- <=> X (s) -1.66V, Y2+ (aq) +2e- <=> Y (s) +0.34V, Z+ (aq) + e- <=> Z (s) +0.80V, Fe2+ (aq) + 2e- <=> Fe (s) -0.44V. Which species causes iron to rust faster?
    Z+
    W2+
    X3+
    Y2+
  • 3. Multiple Choice
    1 minute
    1 pt
    The standard reduction potential of several half-cell reactions are shown below. Sn2+ (aq) + 2e- -> Sn (s) -0.14V Fe2+ (aq) + 2e- -> Fe (s) -0.44V Cr3+ (aq) + 3e- -> Cr (s) -0.74V Mn2+ (aq) + 2e- -> Mn (s) -1.18V Al3+ (aq) + 3e- -> Al (s) -1.66V Which metal will produce the most rust when it comes in contact with iron in an electrolyte?
    Sn
    Al
    Cr
    Mn
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