Coordination Chemistry and Heavy Transition Metals (CHMS4112)
BSc, Chemistry - CHMS
Semester: First Semester
Level: 400
Year: 2018
REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
PEACE - WORK – FATHERLAND P.O Box 39 Bambili
FACULTY OF SCIENCE Course Instructor: Prof. Agwara
Moise
Department of Chemistry Course Code and: CHMS4112 CA
Academic Year: 2017/2018 Course Title:Coord. Chem of Heavy
Trans Metal
Date credit: 08 Sept 2018
Value: 4 Time: 12:30- 14:30
SEMESTER: Resit
INSTRUCTIONS: Answer all questions.
Question 1
a)
Explain the difference between a paramagnetic substance and a diamagnetic substance
b)
How would you distinguish experimentally between a diamagnetic substance and a paramagnetic
substance?
c)
In a simple diagram differentiate between a paramagnetic, an antiferromagnetic and a ferromagnetic
substance.
d)
In magnetism, the following equations are often always used
B = H + 4l
= 2.828
√
Identify the terms in the above equations
e)
What is the origin for the magnetism in a chemical substance?
f)
Using the crystal field theory, explain the following observations (Y and X are monoligands)
Compound
[CoY
6
]
3-
O BM
[CoX
6
]
3-
4.93 BM
g)
Given that for Manganese(ll) complex in an octahedral field X
A
= 16346 x 10
-6
and the experiment was
carried out at 27°C, Calculate the magnetic moment for this complex. Explain your result
Question 2
a)
i) How is the relative instability of a radioactive isotope expressed?
ii) Define this expression
b)
Complete the following nuclear equations
i)
214
β→ X +
214
Po
ii) U
→ U
+ Y
iii) n
→ Z + P
c)
Radioactive Nitrogen -13 has a half-life of 10 mins. After an hour, how much of this isotope remains
in a sample that is originally attained 96 mg?
d) Balance the following equations and state the type of radioactive decay
i) He
+ → He
+ H
ii) Be
+ → C
+ n
e) i) How is radioactivity detected?
ii) What is fission?
iii) State one advantage of fission
iv) What forces hold a nucleus together? How is this related to the stability of the nucleus?
v) Compare nuclear and chemical reactions
f) State one advantage of each of the use of radioactivity in chemistry and medicine
g) i) What do you understand by Lanthanide contraction
ii) State the causes of Lanthanide Contraction
iii) State and explain 2 consequences of lanthanide contraction
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