Oxygen has an atomic number of 8. Which one of the following shows the correct electronic configuration of an atom of oxygen?  

What type of intermolecular force is being shown in the this interaction?  

Which one of the following species behave as an nucleophile?

Which one of the following statements about disulfide bonds is False?

Match the protein form to the correct structural type.

Which one of the following compounds is chiral?  

The concentration of compound X is measured at different time intervals during the course of a chemical reaction. After plotting a graph of the concentration of X against time, shown below, the points labelled A-E on the graph have the following co-ordinates: A: x = 0 seconds; y = 0 mol L-1 B: x = 8 seconds; y = 0.37 mol L-1 C: x = 15 seconds; y = 0.49 mol L-1 D: x = 23 seconds; y = 0.63 mol L-1 E: x = 30 seconds; y = 0.60 mol L-1   What is the rate of the chemical reaction at point C? This question is worth 3 marks.

Which one of the following elements has the highest electronegativity?

Which one of the following nitrogenous bases is not found in DNA?

Questions 41 – 43 relate to the following problem: You have a solution of 0.5 mol dm-3 sodium hydroxide. Titration of 125.0 cm3 of this solution required 30 cm3 of a hydrochloric acid solution for complete neutralisation.                                      What is the concentration of the hydrochloric acid in mol/dm3 (molarity)?