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A Level Chemistry OCR A > 5.3.1: Transition elements and 5.3.2: Qualitative analysis > Flashcards

5.3.1: Transition elements and 5.3.2: Qualitative analysis Flashcards

1
Q

Define a transition element

A

A d block element that forms at least one stable ion with partially filled d subshell

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2
Q

Where are the transition metals located in the

periodic table?

A

In the middle block from Ti to Cu

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3
Q

What are the 2 elements in d block that are not

considered as transition metals?

A

Scandium and zinc

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4
Q

Why is scandium and zinc not considered as

transition metals?

A

Scandium only forms Sc3+, where the d orbitals are empty

Zinc only forms Zn2+ where the d orbitals are full

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5
Q

What is the noble gas configuration of chromium?

A

[Ar]4s1 3d5

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6
Q

What is the noble gas configuration of copper?

A

[Ar]4s1 3d10

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7
Q

Which electrons do transition metals lose first when

forming ions?

A

4s

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8
Q

What are some characteristic physical properties of

transition metals?

A 
● Metallic
● High density
● High melting and boiling point
● Shiny
● Good conductors of heat and electricity
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9
Q 
What are the characteristic chemical properties of
transition metals (4 marks)?
A

● Variable oxidation states → take part in many redox reactions
● Coloured compounds/ions in solution
● Good catalysts
● Form complex ions

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10
Q

In potassium manganate (VII), what is the oxidation

number of Mn?

A

Mn = +7

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11
Q

What are the 2 main ways in which transition metals act

as an effective catalyst?

A

● They provide a surface on which reaction can take place
● They change oxidation states to form
intermediates required for pathways with lower
activation energy

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12
Q

Give some examples of transition metal catalysts and the

processes/reactions they catalyse (4 marks)?

A 
● Iron - Haber process
● Vanadium (V) oxide - contact process
● Nickel - hydrogenation of alkenes
● Manganese (IV) oxide - decomposition of hydrogen
peroxide
● Copper sulfate - hydrogen production
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13
Q

What is a complex ion?

A

Transition metal ion bonded to one or more ligands by coordinate bonds

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14
Q

Define a ligand

A

Molecule or an ion that can donate a pair of electrons to the metal to form a coordinate bond

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15
Q

What is a coordinate bond?

A

A bond in which one of the atom provides both the electrons required for bonding, also known as dative bonding.

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16
Q

What does the coordination number indicate?

A

The number of coordinate bonds formed

between the metal ion and its ligands

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17
Q

What is a mono/unidentate ligand?

A

A ligand that forms one co-ordinate bond to the central metal ion (one lone pair to donate)

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18
Q

What is a bidentate ligand?

A

A ligand that forms two coordinate bonds
to the central metal ion (2 lone pairs to
donate)

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19
Q

What is a multidentate ligand?

A

A ligand that forms three or more

coordinate bonds to the central metal ion

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20
Q

Give some examples of common monodentate

ligands (4 marks).

A

Cl-, H2O, NH3, CN

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21
Q

Name the most common bidentate ligand

A

ethane-1,2-diamine

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22
Q

ethanedioate; how many coordinate bonds can

it form to a transition metal ion?

A

2 co-ordinate bonds

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23
Q

benzene-1,2-diol; how many coordinate bonds

can it form to a transition metal ion?

A

2 coordinate bonds

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24
Q

ethane-1,2-diamine. What is its shortened

name? How many coordinate bonds does it form?

A

2 coordinate bonds, shortened name = en

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25
How many coordinate bonds does EDTA4- form?
six
26
EDTA is a chelating agent, what does that mean?
EDTA decreases the concentration of metal ions in the solution by binding to them and forming complex ions
27
What ion is usually formed when a transition metal compound is dissolved in water? What shape is it?
Aqua ion, 6 H2O ligands around the central metal ion. Octahedral complex ion is formed
28
If a transition metal ion has 2 ligands, what shape is | it usually?
Linear
29
If a transition metal ion has 4 ligands, what shape is | it usually?
Tetrahedral
30
Name an exception to the general rule that ions with | 4 ligands is generally tetrahedral. What shape is it?
Platin is square planar → forms cisplatin
31
What shape is a complex ion if it has 6 ligands?
Octahedral
32
How can complex ions display E-Z or cis-trans | isomerism? What shapes of ions does this apply to?
Ligands differ in the way in which they are arranged in space 2 ligands of the same type can be on the same side of the metal ion (next to each other), which forms the E or cis isomer 2 ligands of the same type can be on opposite sides of the metal ion (not next to each other), which forms the Z or trans isomer Applies to square planar and octahedral complex ions
33
What conditions are needed for a complex ion to | display optical isomerism?
Usually applies to octahedral molecules with 2 or more bidentate ligands, so that the mirror images are non-superimposable
34
What is cis-platin used for? Describe its mechanism | of action
It is used as an anti-cancer drug | It binds to DNA of fast growing cancer cells and prevents cell division, hence reducing the growth of cancer
35
Which metal ion is present in a haem group?
Fe2+
36
What is the coordination number of a haem group?
6
37
What are the ligands in haem group?
4 nitrogen forming the porphyrin ring 1 oxygen 1 globin
38
Why is CO toxic?
CO also coordinately bonds to the Fe2+,and bonds more strongly to Fe2+ than O2. Stops O2 from bonding to haemoglobin, so O2 cannot be transported around the body
39
What colour is [Cu(H2O)6]2+ solution?
pale blue
40
What colour is [Cu(NH3)4(H2O)2]2+ solution?
deep blue
41
What colour is [CuCl4]2- solution?
yellow
42
What colour is [Cr(H2O)6]3+ solution?
dark green
43
What is a precipitation reaction?
A reaction where soluble ions in separate solutions are mixed to form an insoluble compound
44
What colour is Fe2+’s aqua ion?
green
45
What colour is Fe3+’s aqua ion?
pale brown
46
What colour is Cr3+’s aqua ion?
violet
47
What colour is Mn2+’s aqua ion?
pink
48
When Cu2+ reacts with NH3 or OH-, what colour is the precipitate?
blue
49
When Fe2+ reacts with NH3 or OH-, what colour is the | precipitate?
green
50
When Mn2+ reacts with NH3 or OH-, what colour is the precipitate?
brown
51
When Cr3+ reacts with NH3 or OH-, what colour is the | precipitate?
green
52
When Fe3+ reacts with NH3 or OH-, what colour is the | precipitate?
brown
53
What colour is MnO4-?
purple
54
Write a half equation for the reduction of MnO4- to | Mn2+
MnO4- + 8H+ + 5e- → Mn2+ + 4H2O
55
Why are redox titrations with transition metal | compounds said to be self-indicating?
They usually involve a colour change as the metal is changing oxidation state; sometimes an indicator is still needed/useful
56
What colour is Cr2O72-?
orange
57
What colour is Cr3+?
green
58
Write a half equation for the reduction of Cr2O72- to Cr3+.
CrO72- + 14H+ + 6e- → 2Cr3+ + 7H2O
59
Describe how to test for metal ions
● Fill half of the test tube with the sample ● Add aqueous ammonia or sodium hydroxide drop by drop ● Colour of precipitate indicates the ion present
60
Write the method used to test for ammonium ions
● Fill half the test tube with sample ● Add sodium hydroxide and warm gently ● Smelly gas is produced; damp red litmus paper turns blue
61
Why does lime water turn milky in the presence of | carbon dioxide?
When carbon dioxide is bubbled in calcium hydroxide (lime water), calcium carbonate precipitate is formed

A Level Chemistry OCR A (38 decks)

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