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Tec 111: Introduction To Material Science Question Paper

Tec 111: Introduction To Material Science

Course:Bachelor Of Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2011

TEC 111: Introduction to Material Science.

Revision Questions.

1. The elements A, B, X, Y, and Z have atoms with outer electron shell configurations containing 1, 2, 4, 7, and 8 electrons respectively. State and describe the type of bonding which is likely to occur in the following cases.

a. Between a large number of atoms of A

b. Between a large number of atoms of X

c. Between atoms of Y

d. Between atoms of Z

e. Between a mixture of A and B atoms

f. Between equal numbers of A and Y atoms

g. Between one atom of X and four atoms of Y

2. Two elements X and Y which have atomic numbers of 12 and 17 respectively combine to form a compound. What type of bonding would exist in such a compound and what would be the chemical formula of the compound?

3. By use of dots and cross diagrams show covalent bonding between Nitrogens to yield Nitrogen gas

4. What do you understand by the term valency (valence) of an element?

5. Diagramatically show both hydrogen bonding and covalent bonding in a water molecule

6. Why does the water molecule look bent?

7. What are the lone pair electrons

8. When does the hydrogen atop emit a photon

9. What is the electronic configuration of potassium, 19?

10. What is meant by hydrogen bond?

11. Why do different polymers have different properties

12. Determine the number of molecules in 1kg of magnesium chloride. Atomic mass numbers are: Mg=24.32, Cl=35.46

13. By use of illustration, differentiate clearly between steel reinforced concrete and pre-stressed concrete.

14. What is the effect of increase in molecular length of a polymer to the melting temperature?

15. Define the following terms
i. Crystallinity
ii. Thermosets
iii. Elastomer

Tec 111: Introduction To Material Science Question Paper

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