Bonding Q1.What is the formula of calcium nitrate(V)? A CaNO3 B Ca(NO3)2 C Ca2NO2 D Ca(NO2)2 0 0 0 0 (Total 1 mark) Q2. Which species has a lone pair of electrons on the central atom? A CO2 B SO2 C PCI6 D SO42- 0 0 0 0 (Total 1 mark) Q3. Which molecule is not able to form a co-ordinate bond with another species? A BH3 B CH4 C NH3 D H2O 0 0 0 0 0 0 (Total 1 mark) Page 1 of 12
Q4. Which molecule has a permanent dipole? A BF3 B NH3 C SiCl4 D SO3 0 0 0 0 (Total 1 mark) Q5. Use your understanding of intermolecular forces to predict which of these compounds has the highest boiling point. A HF B HCl C HBr D HI 0 0 0 0 (Total 1 mark) Q6. Which statement about intermolecular forces is not correct? A Intermolecular forces exist between all simple molecules. 0 B Hydrogen bonding occurs between HBr molecules. 0 C Hydrogen bonding is the strongest intermolecular force in liquid ethanol. 0 D Hydrogen bonds occur between C=O and H-N in proteins. (Total 1 mark) Page 2 of 12
Q7. Which substance has delocalised electrons? A graphite B iodine C sodium chloride D tetrachloromethane 0 00 0 0 0 0 Q8. (a) Ammonia gas readily condenses to form a liquid when cooled. (i) Name the strongest attractive force between two ammonia molecules. (ii) Draw a diagram to show how two ammonia molecules interact with each other in the liquid phase. Include all partial charges and all lone pairs of electrons in your diagram. (Total 1 mark) (1) (3) (b) Ammonia reacts with boron trichloride to form a molecule with the following structure. H Cl H-N->B-Cl H Cl State how the bond between ammonia and boron trichloride is formed. Page 3 of 12