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 42: How many moles of hydrochloric acid were neutralised? Give your answer to 4 d.p.

Are these molecules geometric isomers of each other, Yes or No?   

Consider the equilibrium reaction N2 + 3H2 ⇌ 2NH3 Determine the equilibrium constant for this reaction if = 0.175 mol/L; = 0.75 mol/L; = 0.55 mol/L Give your answer to 4 s.f.

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

Which one of the following species behave as an electrophile? 

Magnetic sector mass spectrometry separates molecules according to their mass to charge ratio. Using the mass spectra plot below, identify all 3 fragment peaks A ; B ; and C .

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?