Mocks

• Why do RCl and RBr have different rates of hydrolysis?


  RBr is hydrolysed faster because the C-Cl bond enthalpy is greater than C-Br.
• When the initial concentration of X is 1.0 moldm-3 the half life is 16 minutes.

  What is the half life when the initial concentration of X is 2.0 moldm-3?


  16 minutes - half life is constant.
• Does HCN have polar molecules?


  Yes, as it is an asymmetrical molecule.
• How many hydrogen atoms are in 2.50g of pharmacolite, CaHAsO4 2H2O?


  3.48 x 10^22
• Explain what is meant by the term monobasic acid.


  A proton donor in which only one hydrogen will dissociate per one mole.