Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry 3 > Transisition Metals > Flashcards

Transisition Metals Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

What colour ppt does Cu2+ form with hydroxide or nh3

A

Pale blue solution to blue ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What colour does fe 2+ when it reacts with a hydroxide or nh3

A

Pale green solution to green ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What colour does fe 3+ go when it reacts with hydroxide or nh3

A

Yellow solution to orange ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What colour does Mn go when it reacts with hydroxide or nh3

A

Pale pink solution to pink ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What colour does cr 3+ go when it reacts with hydroxide or nh3

A

Green solution to grey green ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What forms with [Cu(H2O)6]2+ and excess nh3

A

Reacts further from [Cu(OH)2(H2O)4] to [Cu(NH3)4(H2O)2]

Dark blue ppt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What happens when [cr(h2o)6]3+ reacts with excess NaOH

A

Forms [Cr(OH)6]3-

Dark green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens when [cr(h2o)6]3+ reacts with excess nh3

A

Forms [Cr(nh3)6]3+

Purple colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Define transition element

A

D block element
Can form at least 1 stable ion
With an incomplete sub shell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the electron configuration of Cr

A

3d5 4s1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the electron configuration of Cu

A

3d10 4s1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Why isn’t sc a transition metal

A

Only forms 1 stable ion: Sc3+

But it has an empty d sub shell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why isn’t Zn a transition metal

A

Only forms 1 stable ion: Zn2+
Looses both electrons from the 4s
So has a complete d sub shell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does Cuso4 catalyse

A

Zn + acids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does mno2 catalyse

A

Decomposition of h2o2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does fe catalyse

A

The haver process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Why do transition elements make good catalysts

A

Change ox states easily by gaining or losing electrons from their d orbitals
So the transfer of electrons speeds up the rate of reaction

Good at adsorbing substances onto their surfaces to lower their activation energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the risk of using transition metals as catalysts

A

They are toxic
Cu = liver and kidney damage
Mn = physiatric problems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Define complex ion

A

Metal ion surrounded by coordinately bonded ligands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is a coordinate bond

A

When both electrons in a shared pair come from 1 atom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is a ligand

A

Atom/ion/molecule that donates a pair of electrons to a central metal ion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the coordination number

A

The number of coordinate bonds attached to the central metal ion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is a monodentate Ligand

A

One lone pair available for bonding

24
Q

What is a ligand with 2 lone pairs available for bonding

A

Bidentate

25
Q

What type of isomerism do complex ions show

A

Cis/trans and optical

26
Q

What shape is cis platin

A

Square planar

27
Q

How is cis platin an anti cancer drug

A

Cl are displaced
pt bonds to 2 N atoms on the cancer cells dna
Blocks the translation and transcription of dna
Cell can’t divide
Cell dies

28
Q

Why is cis platin bad

A

Prevents division of normal cells
Suppresses immune system increasing risk of infection
Kidney damage

29
Q

What type of reaction do complex ions undergo

A

Ligand substitution

30
Q

What happens when the ligands substitution uses similar size Ligands

A

Same coord no

Same shape

31
Q

What is the colour change in the reaction and write an equation:
Cr(h2o)6]3+ + 6nh3

A

-> cr(nh3)6]3+ + 6h2o

Violet -> purple

32
Q

What happens in ligand substitution when the Lignads are different sizes

A

Change coord no

Change shape

33
Q

Give the equation and colour change and change in shape of this reaction
Cu(H2O)6]2+ + 4cl-

A

-> cu(Cl)4]2- + 6h20
Pale blue -> yellow
Octahedral-> tetrahedral

34
Q

Give the equation and colour change of the reaction:
Cu(H2O)6]2+ + 4nh3

Why does nh3 have to be in excess

A

Cu(nh3)4(H2O)2]2+ + 4h2o

Pale blue to deep blue

You get a hydroxide ppt

35
Q

How many coordinate bonds does haemoglobin have

A

6

36
Q

How many lone pairs does the haem group give

A

4

37
Q

How many lone pairs does the globin group give

A

1

38
Q

Apart from N what else is bonded to the fe in haemolglobin

A

H2O

39
Q

What happens to haemoglobin in the lungs

A

High o2 conc
Water replaced by o2
Forms ocyhaemoglobin
Transported around the rest of the body

40
Q

Why is CO so dangerous

A

Co swaps with H2O ans binds to the fe
Forms carboxyhaemoglobin
Co is a strong ligand and won’t swap back with o2
So o2 isn’t transported around the body

41
Q

How is fe2+ oxidised to fe3+

A

Acidified KMnO4

42
Q

What is the colour change from fe2+ to fe3+

A

Pale green -> yellow

43
Q

What is the half equation for KMnO4 as an oxidising agent

A

MnO4- + 8H+ + 5e- -> Mn2+ + 4H2o

44
Q

What is the half equation of the oxidation of fe2+ to fe3+

A

Fe2+ -> fe3+ + e-

45
Q

How is fe3+ reduced to fe2+

What is the colour change

A

I- ions

Yellow -> pale green

46
Q

What is the half equations for the reduction of fe3+ using I-

A

2I- -> I2 + 2e-

Fe3+ + 3- -> Fe2+

47
Q

How is the cr3+ ion in cr(oh)6]3- oxidised to cro4)2- solution

A

Warm with hydrogen peroxide
H202
In alkaline solutions

48
Q

What is the half equations for the intro conversion between cr3+ to cro42-

A

H2o2 + 2e- -> 2Oh-

2cr(oh)6]3- + 4OH- -> 2Cro4)2- + 8H2o + 6e-

49
Q

What is the eqauition to produce the orange cr2o7)2-

A

2CrO4)2- + 2H+ -> cr2o7)2- + h29

H+ comes from dilute sulfuric acid

50
Q

How is cr2o7)2- reduced to cr3+

And what is the colour change

A

Organe to green

Add acidified Zn

51
Q

What are the half equation for the reduction to cr3+ using Zn

A

Zn -> zn2+ + 2e-

Cr2O7)2- + 14H+6e- -> 2Cr3+ + 7h2o

52
Q

How is cu2+ reduced to Cu+

What is the colour change

A

I- ions

Pale b,he -> off white ppt

53
Q

What is the eqauition for the reduction of cu2+ to Cu+

A

2cu2+ + 4i- -> 2cui + i2

54
Q

Why does Cu+ spontaneously disproportionates

A

It’s unstable

55
Q

What is the reaction of Cu+ disproportionatation

A

2cu+ -> Cu + cu2+

56
Q

What ode spontaneous disproportion mean

A

The species oxidises ans reduced itself

Chemistry 3 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions