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Chemsitry > transition metal > Flashcards

transition metal Flashcards

1
Q

VO2+ (+5)

A

Yellow

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2
Q

VO 2+ (+4)

A

Blue

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3
Q

V3+

A

green

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4
Q

V2+

A

violet

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5
Q

cobalt

A

cobaltate

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6
Q

aluminium

A

aluminate

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7
Q

chromium

A

chromate

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8
Q

vanadium

A

vanadate

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9
Q

copper

A

cuprate

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10
Q

iron

A

ferrate

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11
Q

excess NH3

A

copper
chromium
cobalt
dissolve with excess NH3

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12
Q

hexaaquacopper(II)ion + conc HCl

A

blue –> yellow [CuCl4]2- + 6H2O (l)

colour appears green

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13
Q

Cu(H2O)4(OH)2 ppt

A

pale blue (Dropwise NH3/OH-)

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14
Q

[Cu(NH3)4 (H2O)2]2+

A

deep blue solution (excess ammonia)

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15
Q

Cr(OH)3 (H2O)3 ppt

A

green ppt (dropwise NH3/OH-)

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16
Q

[Cr(NH3)6]3+

A

Purple solution

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17
Q

Co(H2O)4(OH)2 ppt

A

blue ppt

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18
Q

[Co(NH3)6]2+

A

pale brown solution that eventually darkens

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19
Q

[Co(H2O)6]2+

A

PINK

20
Q

[Fe(H20)6] 2+

A

PALE GREEN

21
Q

[Fe(H2O)6]3+

A

YELLOW

22
Q

Fe(H2O)4(OH)2

A

green ppt with dropwise NaOH/NH3

23
Q

Fe(H2O)3(OH)3

A

browny-red ppt with dropwise NaOH/NH3

24
Q

[Cr(H2O)6]3+

A

GREEN

25
Q

Cr(H2O)3(OH)3

A

Green ppt

26
Q

[Cr(OH)6]3-

A

Dark green solution

27
Q

what is the only tm ion that dissolves in excess hydroxide ions

A

chromium

28
Q

amphoteric hydroxide/ion

A

acting both as an acid/base therefore can dissolve in either acid/alkali

29
Q

How many oxidation states can does chromium have?

A

+2 +3 +6

30
Q

what conditions are needed to oxidise chromium 3+ ions to chromate ions? (cro4 2-)

A

alkaline + H2O2

31
Q

CrO4 2-

A

yellow

32
Q

reduction of H2O2 –> 2OH-

A

H2O2 + 2H+ + 2e- –> 2OH-

33
Q

oxidation of Cr3+ –> CrO4 2-

A

Cr 3+ + 8OH- —> CrO4 2- + 4H2O + 3e-

34
Q

What conditions are needed to reduce Cr 3+ –> Cr2+

A

zn using acidic condtions

35
Q

oxidation of zn

A

zn –> zn2+ + 2e-

36
Q

reduction of Cr3+

A

cr3+ + e- –> cr2+

37
Q

what conditions are needed as well as zn and acid and explain why?

A

anaerobic conditions

because zn2+ are very powerful reducing agents which are therefore rapidly oxidised back to cr3+ by oxygen

38
Q

cr2+

A

blue-violet

39
Q

what does chromium’s colour in the +6 state rely on?

A

2CrO4 2- + 2H+ —> Cr2O7 2- + H2O

40
Q

Kstab

A

equilibrium constant for a TM ligand substitution

41
Q

[CoCl4] 2-

A

blue

42
Q

haber process

A

Fe (s)

43
Q

hydrogenation

A

Ni

44
Q

contact process

A

V2O5

45
Q

Reforming

A

Pt

46
Q

desorption

A

molecules/ions released from solid surface

47
Q

adsorption

A

molecules/ions are held onto the surface of a solid

Chemsitry (9 decks)

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