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chemistry > module 5 (p2) > Flashcards

module 5 (p2) Flashcards

1
Q

what are precipitation reactions

A

acid-base reactions

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2
Q

what does the charge of the acid denote

A

the number of OH- ions needed to react

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3
Q

what is the colour change when hexaquacopper (II) is reacted with NaOH or NH3

A

pale blue solution –> pale blue ppt

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4
Q

what is the colour change when hexaquamanganese (II) reacts with NaOH or NH3

A

pale pink solution –> brown ppt.

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5
Q

what is the colour change when hexaquairon (II) reacts with NaOH

A

pale green solution –> green ppt.

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6
Q

what’s the colour change when hexaquairon (III) reacts with NaOH

A

pale yellow solution –> rusty brown ppt.

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7
Q

what’s the colour change when hexaquachromium (III) reacts with NaOH

A

green solution –> green ppt.

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8
Q

which compounds are soluble in excess

A

chromium

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9
Q

what’s the ionic equation for Mn2+ reacting with NaOH

A

Mn2+ + 2OH- -> Mn(OH)2

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10
Q

what’s the ionic equation for Fe3+ reacting with NaOH

A

Fe3+ + 3OH- -> Fe(OH)3

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11
Q

what’s the equation for chromium in excess with NaOH

A

[Cr(OH)3(H2O)3] + 6OH -> [Cr(OH)6]3- + 3H2O + 3OH-

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12
Q

give the reaction for the reaction of hexaquairon (III) with NH3

A

[Fe(H2O)6]3+ + 3NH3 -> [Fe(OH)3(H2O)3] + 3NH4+

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13
Q

which complex ion is soluble in excess of NH3

what colour does the solution form

A

Cu2+

deep blue

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14
Q

define a transition metal

A

d-block element which forms an incomplete ion

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15
Q

what are the properties of TM

A

various oxidative states

form coloured compounds

act as catalysts

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16
Q

define a coordinate bond

A

shared pair of electrons are donated to the TM

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17
Q

define a ligand

A

molecule/ion that donates pair(s) of electrons to TM ion forming coordinate bond(s)

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18
Q

what is the formula of the ethanoate ion

A

C2O4 2-

19
Q

what is the reaction of hexaquacopper (II) with dilute ammonia

A

[Cu(H2O)6]2+ + 2NH3 –> [Cu(OH)2(H2O)4] + 2NH4+

20
Q

what is the reaction of hexaquacopper (II) in concentrated (excess) ammonia

A

[Cu(OH)2(H2O)4] + 4NH3 –> [Cu(NH3)4(H2O)2]2+ + 2H2O + 2OH-

21
Q

what is the colour change in the reaction of hexaquacopper (II) in concentrated (excess) ammonia

A

pale blue ppt –> deep blue solution

22
Q

what is the reaction of hexaquachromium (III) in concentrated (excess) ammonia

A

[Cr(OH)3(H2O)3] + 6NH3 –> [Cr(NH3)6]3+ + 3H2O + 3OH-

23
Q

what is the colour change in the reaction of hexaquachromium (III) in concentrated (excess) ammonia

A

green ppt –> purple solution

24
Q

what does cis-trans isomerism only apply to what shape molecule in TM ions

A

square planar

25
Q

what is a cis square planar molecule have angles between the same groups

A

90 degrees

26
Q

what is a trans square planar molecule have angles between the same groups

A

180 degrees

27
Q

what is cisplatin

A

binds to DNA and prevents cell division

anti cancer

[PtCl2(NH3)2]

28
Q

what are the risks associated with cisplatin

A

prevents normal cells from respiring

side effects (nausea, vomiting, etc.)

can develop resistance to cisplatin

29
Q

what is the reaction of the oxidation of Fe2+ in manganate ion

A

5Fe2+ + MnO4- + 8H- –> Mn2+ + 5Fe3+ + 4H2O

30
Q

what are the colour changes in the oxidation of Fe2+

A

MnO4- is purple

Mn2+ is colourless

the endpoint for the reaction is a tinge of pink

31
Q

what is the reaction for the reduction of Fe3+

A

2Fe3+ + 2I- –> 2Fe2+ + I2

32
Q

what are the colour changes in the reduction of Fe3+

A

Fe3+ is rusty brown

Fe2+ is green

I2 is dark brown

the colour change is overrided from rusty brown to dark brown (can’t see green)

33
Q

what is the reaction for oxidation of Cr3+

A

2Cr3+ + 3H2O + 10OH- –> 2CrO4 2- + 8H2O

34
Q

what are the colour changes in the reaction for oxidation of Cr3+

A

Cr3+ is green

CrO4 2- is yellow

35
Q

what is the reaction for the reduction of dichromate ion

A

Cr2O7 2- + 14H+ + 3Zn –> 2Cr3+ + 3Zn2+ + 7H2O

36
Q

what is the colour changes for the reduction of the dichromate ion

A

dichromate ion is orange

chromium (III is green

37
Q

what is the ligand substitution reaction for hexaquacopper (II) in ammonia

A

[Cu(H2O)6]2+ + 4NH3 –> [Cu(NH3)4(H2O)2]2+ + 4H2O

38
Q

what is the colour change for the ligand substitution reaction for hexaquacopper (II) in ammonia

A

pale blue solution –> deep blue solution

39
Q

what is the ligand substitution reaction for hexaquacopper (III) in chloride ions

A

[Cu(H2O)6]2+ + 4Cl- –> [CuCl4]2- + 6H2O

40
Q

what is the colour change for the ligand substitution reaction for hexaquacopper (II) in chlorine

A

pale blue solution –> yellow solution

41
Q

what is the ligand substitution reaction for hexaquachromium (III) in ammonia

A

[Cr(H2O)6]3+ + 6NH3 –> [Cr(NH3)6]3+ + 6H2O

42
Q

what is the colour change for the ligand substitution reaction for hexaquachromium (III) in ammonia

A

violet solution –> purple solution

43
Q

why in the ligand substitution reaction for hexaquacopper (II) in chlorine does the complex change shape

A

chloride ions are larger than water molecules so only 4 fit around copper

change of shape from octahedral (blue) to tetrahedral (green)

chemistry (8 decks)

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