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 statements regarding glucose metabolism is False?

Which of the following statements about reaction kinetics is False?

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

Which of the following phrases correctly completes the sentence ‘Chemical reactions occur spontaneously……..’

Which one of the following statements about bonding is False?

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.                                                                                             How many moles of hydrochloric acid were neutralised?

Nitrogen has an atomic number of 7. Which one of the following shows the correct electronic configuration of an atom of nitrogen?

What is the pH of a 0.15 M solution of formic acid (Ka = 1.77 x 10-4)? Give your answer to 2 d.p.  This question is worth 2 marks.

A hydrophilic compound will usually dissolve into an aqueous solvent. True or false?