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A Level Chemistry > Transition metal colours > Flashcards

Transition metal colours Flashcards

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1
Q

What colour change occurs when NaOH is added to [Cu(H2O)6]^2+?

A

blue solution to pale blue precipitate

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2
Q

What colour change occurs when NaOH is added to [Cr(H2O)6]^3+?

A

violet solution to grey-green precipitate

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3
Q

What colour change occurs when excess NaOH is added to [Cr(H2O)6]^3+?

A

violet solution to dark green solution

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4
Q

What colour change occurs when excess NaOH is added to Cr(OH)?

A

grey-green precipitate to dark green solution

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5
Q

What colour change occurs when NaOH is added to [Fe(H2O)6]^2+?

A

pale green solution to green precipitate

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6
Q

What colour change occurs when NaOH is added to [Fe(H2O)6]^3+?

A

pale yellow solution to orange-brown precipitate

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7
Q

When Fe(OH)2 is oxidised in air, what colour change occurs?

A

it goes brown as its oxidised

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8
Q

What colour change occurs when dilute NH3 is added to [Cu(H2O)6]^2+?

A

blue solution to pale blue precipitate

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9
Q

What colour change occurs when concentrated NH3 is added to [Cu(H2O)6]^2+?

A

blue solution to deep blue solution

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10
Q

What colour change occurs when dilute NH3 is added to [Cr(H2O)6]^3+?

A

Violet solution to green precipitate

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11
Q

What colour change occurs when concentrated NH3 is added to [Cr(H2O)6]^3+?

A

Violet solution to purple solution

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12
Q

What colour change occurs when NH3 is added to [Fe(H2O)6]^2+?

A

green solution to green precipitate

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13
Q

What colour change occurs when NH3 is added to [Fe(H2O)6]^3+?

A

yellow solution to orange-brown precipitate

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14
Q

What colour change occurs when NaOH is added to [Mn(H2O)6]^2+?

A

pale pink solution to light brown precipitate

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15
Q

What colour change occurs when NH3 is added to [Mn(H2O)6]^2+?

A

pale pink solution to light brown precipitate

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16
Q

What colour change occur during the following reaction?

MnO4^- + 8H^+ → Mn^2+ + 4H2O + 5Fe^3+

A

Purple to pink

17
Q

What colour change occurs when HCl is added to [Fe(H2O)6]^3+?

A

Yellow solution to yellow solution

18
Q

What colour change occurs when iodide ions are added to Fe^3+?

A

Yellow to brown

the Fe^2+ would be green but the brown of the I2 is stronger

19
Q

What colour change occurs when HCl is added to [Cu(H2O)6]^2+?

A

blue solution to yellow solution

20
Q

What colour change occurs when iodide ions are added to [Cu(H2O)6]^2+?

A

blue solution to a brown solution with a white precipitate in

21
Q

What colour change occurs when H2SO4 is added to Cu2O, write the two equations relevant to this.

A

The solution should go blue.
2Cu^+ (aq) → Cu (s) + Cu^2+ (aq)
2Cu2O2 (s) + H2SO4 → Cu (s) + CuSO4 (aq) +H2O (l)

22
Q

What colour change occurs when zinc is added to dichromate ions?

A

orange to green

23
Q

What colour change occurs when zinc is added to dichromate ions in acid?

A

green solution to blue solution

24
Q

What colour change occurs when chromium ions are added to hot alkali?

A

green solution to yellow solution

25
Q

What’s the equations for when NaOH is added to [Cu(H2O)6]^2+?

A

2OH^- + [Cu(H2O)6]^2+(aq) ⇌ Cu(OH)2(H2O)4 + 2H2O

26
Q

What’s the equations for when dilute NH3 is added to [Cu(H2O)6]^2+?

A

2NH3 + [Cu(H2O)6]^2+(aq) ⇌ Cu(OH)2(H2O)4 + 2NH4^+

27
Q

What’s the equations for when concentrate NH3 is added to [Cu(H2O)6]^2+?

A

4NH3 + [Cu(H2O)6]^2+(aq) ⇌ Cu(NH3)4(H2O)2 + 2H2O

28
Q

What’s the equations for when NaOH is added to [Cr(H2O)6]^3+?

A

3OH^- + [Cr(H2O)6]^3+(aq) ⇌ Cr(OH)3(H2O)3 + 3H2O

29
Q

What’s the equations for when excess NaOH is added to [Cr(H2O)6]^3+?

A

Cr(OH)3(s) + 3OH^-(aq) → [Cr(OH)6]^3-

30
Q

What’s the equations for when dilute NH3 is added to [Cr(H2O)6]^3+?

A

3NH3 + [Cr(H2O)6]^3+(aq) ⇌ Cr(OH)3(H2O)3 + 3NH4^+

31
Q

What’s the equations for when excess NH3 is added to [Cr(H2O)6]^3+?

A

6NH3 + [Cr(H2O)6]^3+(aq) ⇌ Cr(NH3)6 + 6H2O

32
Q

What’s the equation for when HCl is added to [Cu(H2O)6]^2+?

A

[Cu(H2O)6]^2+ + 4Cl^- (aq) ⇌ [CuCl4]^2- + 6H2O

33
Q

What’s the equation for when iodide ions are added to copper (II) ions?

A

2Cu^+ (aq) + 4I^- (aq) → 2CuI (s) + I2

A Level Chemistry (12 decks)

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