4_bond - < solid/AL90P1_2c 2(c Compare and contrast the two...

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<<< solid/AL90P1_2c 2. (c) Compare and contrast the two close packing atomic arrangement in metals. (3 marks) <<< itmf/AL90P2_3c 3. (c) Arrange the following substances in order of increasing melting point: NaF, F 2 , HF. Explain your order in terms of the bonding involved. (4 marks) <<< bond/AL90P2_4b 4. (b) Account for the following observations. SiO 2 is a solid with a high melting point, whereas CO 2 is a gas at room temperature. (4 marks) <<< BOND/AL90P2_5a 5. (a) Give the structures of, and indicate the types of bonding in, LiCl, AlCl 3 , PCl 3 and K 2 NiCl 4 . Also, discuss their physical and chemical properties in terms of structure and bonding. (10 marks) <<< BOND/AL90P2_6a 6. (a) The following species are either impossible to prepare or very unstable. Explain, in each case, why this is so. (i) NCl 4 (iv) [NaI 4 ] 3- (ii) SI 6 (v) [PO 4 ] 2- (iii) ArCl 2 (vi) [Co(NH 3 ) 8 ] 3+ (9 marks) <<< solid/AL91P1_2d 2. (d) (i) Iron has a body-centred cubic structure. Draw a unit cell representation of iron. (ii) The relative mass of iron is 55.8 and the atomic radius of iron in a body-centred structure is 0.124 nm. Calculate the density of iron in g.cm -3 . (Avogadro constant is 6.02 × 10 23 mol -1 ) (iii) Explain electrical conductivities of iron and of caesium chloride are different in solid state. (5 marks) <<< BOND/AL91P1_3d 3. (d) Draw the molecular shapes of (i) PCl 5 (g) and (ii) SF 6 (g) (2 marks) <<< itmf/AL91P2_2a 2. (a) Arrange the following substances in order of increasing boiling points: C 2 H 5 Cl, CH 4 and C 2 H 6 . Explain your order by comparing the relative magnitudes and nature of the intermolecular forces (4 marks) <<< BOND/AL91P2_5e 5. (e) Why is the bond angle in NF 3 smaller than that in NH 3 ? (2 marks) <<< solid/AL92P1_2d
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2. (d) The arrangement of atoms in metals can be described by the close-packing of spheres. (i) Which close-packed structure does abcabcabc. .. describe? Indicate on the diagram below one tetrahedral hole (marking it T) and one octahedral hole (marking it O). (ii) Describe the bonding in metallic crystals. (iii) Of the three energy ranges in kJ mol -1 given below: 5 - 100 200 - 700 800 - 1500 which is the most likely energy range for the change M(s) --> M(g), where M is a metal? (4 marks) <<< BOND/AL92P1_3g 3. (g) Draw diagrams showing the shapes of the following molecules. Indicate the lone pairs (if any) on each central atom. (i) ICl (ii) XeOF 4 (3 marks) <<< BOND/AL92P2_2b 2. (b) Give a brief account of the electron density of the hydrogen molecule. Your answer should include an electron density map. (4 marks) <<< itmf/AL92P2_3a 3. (a) (i) Describe the bonding and intermolecular forces in ice and in SiO 2 solid. (ii)
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4_bond - < solid/AL90P1_2c 2(c Compare and contrast the two...

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