What is the pH of an HCl solution at a concentration of 4.68 x 10–4 mol L–1? Give your answer to 2 d.p.

Which one of the following statements regarding glucose metabolism is true?

Questions 41 – 43 relate to the following problem: A solution of sodium hydroxide contained 0.95 mol dm-3. Using phenolphthalein indicator, titration of 50.0 cm3 of this solution required 27.0 cm3 of a hydrochloric acid solution for complete neutralisation.                                       Question 41: How many moles of sodium hydroxide were neutralised? Give your answer to 4 d.p.

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 = 110 seconds; y = 71 mol L-1 C: x = 225 seconds; y = 92 mol L-1 D: x = 330 seconds; y = 126 mol L-1 E: x = 450 seconds; y = 120 mol L-1     What is the rate of the chemical reaction at point C?       

At which point in the following reaction schematic are bonds being formed?

Are the following molecules likely to be hydrophilic or hydrophobic?      

Which one of the following is a non-polar bond?   

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

ATP has a molar absorptivity of 15400 L mol-1 cm-1 at 259 nm. An ATP solution of unknown concentration gives an absorbance of 1.9 at 259 nm when placed in a cuvette with a path length of 1 cm. What is the concentration of ATP in the unknown solution? This question is worth 2 marks.

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 sodium hydroxide were neutralised?