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Question:
(i) Differentiate between ionic, metallic, covalent and dipole-dipole bonds. Provide examples in each case.
(ii) With regard to electronic con?guration, what do all the elements in Group VII of the periodic table have in common?
(iii) Describe why hydrogen ?uoride (HF) has a higher boiling temperature than hydrogen chloride (HCl) (19.4ºC vs. - 85ºC), even though HF has a lower molecular weight.
(iv) On the basis of the hydrogen bond, explain the anomalous behaviour of water when it freezes. That is, why is there volume expansion upon solidi?cation?
(a) Copper has an atomic radius of 0.128 nm, a face-centered cubic crystal structure and an atomic weight of 63.5 g/mol. Compute
(i) the volume of a unit cell of copper
(ii) the atomic packing factor
(iii) the theoretical density of copper.
A diluted polymer solution with a density of 1130 kg/m3 was extruded by a capillary tube of 3.5 mm internal diameter and 1 m long. The following results were contained at 25°C.
Which processes is used to harden a steel? Quenching process is used to harden the steel
Why is geometrical isomers not possible in tetrahedral complexes having two different types of unidentate ligands? Solution) Tetrahedral complexes do not show geometrical isomeri
Bakelite: It is thermosetting plastics which are most widely used and the most important plastics. Preparation: It is formed by condensation reaction of phenol an
explain why carbon tetra-chloride does not dissolve in water?
Question: a) If you were a newly appointed environmental engineer in a wastewater treatment plant and one of your tasks was to characterise the wastewater. According to you,
The concentration of hydrogen ions in solution affects the enzyme activity. Every enzyme has maximal efficiency under an optimum pH. As pH is one of the factors for the denatura
electrode system
Which of the following principles/rules limits the maximum number of electrons in an orbital to two: (1) Aufbau principle (2) Pauli's exclusion principle (3) Hund's rule
Uses of Nitro alkanes or Nitroparaffins (1) Nitro alkanes are used as solvents for polar substances such as cellulose acetate, synthetic rubber etc. (2) Nitro alkanes are us
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