Chemistry Paper 4 EdexcelWatch
2a) As the atomic number increases in group 4 the metallic character of the elements increases. Explain how this increase in metallic character is demonstrated in the acid-base properties of carbon dioxide and of lead(II) oxide.
2bii) suggest a reason for the difference in behaviour of SnO2 and PbO2 with concentrated hydrochloric Acid.
PCl5 <-> PCl3 + Cl2
(ii) at a given temperature T a sample of Phosphorous pentachloride is 40.0% dissociated, the total equilibrium pressure being 2.00 atm. Calculate the partial pressures of each of the compnents of the equilibrium mixture, to three significant figures. Hence calculate the value of Kp under these conditions.
4b) If sodium proponoate is dissolved in water, the pH of the resulting solution is not 7 but is near to 8. by writing the equation for the reaction occuring suggest why this is so.