Fuhua 2018 Prelim P1

2 Multiple Choice Questions [40 marks] Answer all questions and shade your answers on the OMR sheet provided. 1 What physical processes could be used to separate ethanol and water? 1 distillation 2 filtration 3 sublimation 4 use of separating funnel A 1 only B 1 and 4 only C 1, 2 and 3 only D 1, 2, 3 and 4 2 A mixture of gases is passed through the apparatus shown. Only one of the gases is collected. What is the property of this gas? A The gas burns with a blue flame. B The gas explodes in the presence of a lighted splint. C The gas produces a white precipitate in limewater. D The gas turns moist red litmus blue. 3 The conical flask contains compound X which is present in the solid, liquid and gaseous states. Which statement is correct? A A gaseous X molecule has a lower mass than a liquid X molecule. B Energy is released when X changes from liquid to solid. C Liquid X is at a higher temperature than solid X. D Liquid X molecules vibrate about fixed positions. gas mixture aqueous sodium hydroxide aqueous bromine water FHSS 2018 Prelim P1 and P2

3 4 An experiment was set up as shown below. It was observed that after leaving it for several days, the liquid in the jar had the same colour throughout. This was the result of the movement of A iodine and water molecules. B iodine molecules. C iodide ions and iodine atoms. D iodide ions and water molecules. 5 Aqueous sodium hydroxide was added to a mixture of an aqueous solution of Z. On warming, ammonia gas evolved. When aluminium foil is added to the reaction mixture and warmed, more ammonia gas was given off. What could be the identity of Z? A aluminium nitrate B aluminium sulfate C ammonium nitrate D ammonium sulfate 6 The table gives the electrical conductivity of four substances. P does not conduct under any condition Q conducts when dissolved in water R conducts when molten S conducts when solid and when molten What could be the identity of P, Q, R and S? P Q R S A ammonia ethanol magnesium oxide zinc B ammonia magnesium oxide ethanol zinc C ethanol ammonia magnesium oxide zinc D magnesium oxide ammonia zinc ethanol water iodine

4 7 Compound P contains two elements, metal Q and non-metal, R. P consist of a lattice of positive and negative ions. Each positive ion is surrounded by four anions and each negative ion is surrounded by two cations. What ions are present in, and what is the formula of, compound P? ions present formula A Q+ R2- Q2R B Q2+ R- QR2 C R+ Q2- R2Q D R2+ Q- RQ2 8 When excess aqueous ammonia is added to an aqueous solution of a salt X, a white precipitate forms. X also produces a white precipitate when added to aqueous lead(II) nitrate. X could be A aluminium sulfate B calcium chloride C zinc chloride D zinc sulfate 9 Which of the following descriptions best distinguishes a weak acid from a strong acid