Sodium chloride and iodine are both solids. Sodium chloride does not melt until it reaches a temperature of 1074 K yet iodine sublimes when heated gently, giving off purple vapours. Sodium chloride will conduct electricity when molten and iodine is a very poor conductor of electricity.
State the type of crystal structure for each of iodine and sodium chloride.
Ammonia, NH3, and boron trifluoride, BF3, react together to form NH3BF3. Each of the molecules NH3 and BF3 have different features of its electronic structure which allows them to bond together. Explain how the two molecules bond together and what type of bond is formed between NH3 and BF3.
Aluminium chloride,Al2Cl6, does not conduct electricity when molten but aluminium oxide,Al2O3, does. Explain this in terms of the structure and bonding of the two compounds.
N, N–dinitronitramide N(NO2)3, also known as trinitramide, has been identified as a potentially more environmentally friendly rocket fuel oxidant.
Using section 10 of the data booklet, outline how the length of the bond between nitrogen atoms in trinitramide compares with the bond between nitrogen atoms in nitrogen gas, N2.
