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ASTAR CHEMISTRY > transition metals. > Flashcards

transition metals. Flashcards

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1
Q

what is the oxidising agent to reduce Fe2+

A

KMnO-

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2
Q

what is the half equation for the reduction of Fe2+

A

5Fe 2+ → 5Fe3+ + 5e (oxidation)

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3
Q

what is the half equation for the half cell of the oxidising agent of Fe2+?

A

MnO4- + 5e + 8H+ ——> Mn2+ + 4H2O

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4
Q

what is the colour change regarding the oxidation of Fe2+

A

green( Fe2+) to orange ( Fe3+)

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5
Q

what is the colour change regarding the oxidising agent used in oxidation of Fe2+

A

Purple (MnO4-) to colourless Mn2+

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6
Q

what is the reducing agent used to reduce Fe3+?

A

I- ions (ie from KI)

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7
Q

write the half equation for the reduction of Fe3+

A

Fe3+ + e —–> Fe2+

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8
Q

write the half equation for the oxidation of the reducing agent of Fe3+

A

2I- → I 2 + 2e

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9
Q

what is the colour change observed in Fe3+ reduction.

A

orange -> green however masked by production of I2 which forms a brown colour.

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10
Q

what is the reducing agent in the reduction of chromium?

A

acidified Zn

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11
Q

what is the colour change seen in the reduction of chromium?

A

orange ==> green

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12
Q

what are the conditions of reduction of chromium?

A

acidic conditions.

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13
Q

what is the reduction half equation in reduction of chromium?

A

Cr2O7 2- + 6e + 14H+ → 2Cr3+ + 7H2O

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14
Q

what is the oxidation half equation of reduction of chromium?

A

3Zn → 3Zn2+ + 6e

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15
Q

what colour are dichromate ions and what colour are chromium ions?

A

orange -> green

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16
Q

what is the reducing agent used to reduce Cu2+

A

Iodine, provided by potassium iodide.

17
Q

what is the colour change seen in the reduction of copper?

A

blue CU2+(aq) ions to a white precip of CuI and a brown solution of Iodine (I2)

18
Q

what is the half equation for the reduction of copper?

A

Cu2+ + 2e → Cu+ ( reduction )

19
Q

what is the half equation for the reducing agent for reduction of copper?

A

2I-(aq) → I2(aq) + 2e ( oxidation )

20
Q

what conditions are needed for the disproportionation of copper?

A
  • hot sulfuric acid.
21
Q

what is the Cu2+ disproportionation reaction?

A

Cu2O + H2SO4 → CuSO4 + Cu + H2O

22
Q

what is the ionic equation of the disproportionation of Cu2+?

A

2Cu2+ → Cu + Cu2+

ASTAR CHEMISTRY (11 decks)

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