MI_H1_CHEM_P1 Promo

Class Adm No Candidate Name: Promotional Examination II 2009 Pre-university 2 H1 CHEMISTRY 8872 PAPER 1 8872 / 1 Tuesday 15 September 2009 50 m Additional materials: OMR Data Booklet INSTRUCTIONS TO CANDIDATES 1. Do not turn over this question paper until you are told to do so. 2. Write your name, class and index number in the spaces provided at the top of this page and on the OMR provided. 3. Answer ALL questions and shade the correct answers on the OMR provided. 4. Hand in the question paper and the OMR separately. FOR EXAMINER’S USE Section Total Marks 30 INFORMATION FOR CANDIDATES Marks will not be deducted for wrong answers; your total score on this test will be the number of correct answers given. This question paper consists of 13 printed pages.

2 SECTION A (25 marks) For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct. 1. Which statement is FALSE ? A One mole of 12C has a mass of 12.00g. B One mole of methane contains 75% of carbon by mass. C One mole of methane contains four moles of hydrogen atoms. D One mole of hydrogen gas contains 6.02  1023 atoms of hydrogen. 2. A 1.881 g sample of an unknown metallic carbonate is decomposed by heating to form the metallic oxide and 0.66 g of carbon dioxide according to the equation: MCO 3(s)  MO(s) + CO2(g) What is metal, M? A Ca B Mn C Ni D Zn 3. In an experiment, 50 cm 3 of a 0.1 mol dm -3 solution of a metallic salt reacted exactly with 25 cm3 of 0.1 mol dm -3 sodium sulphite solution. The half equation for oxidation of sulphite ion is SO3 2- (aq) + H2O (l)  SO4 2- (aq) + 2H+ (aq) + 2e- If the original oxidation number of the metal in the salt was +3, what would be the new oxidation number of the metal? A 0 B +1 C +2 D +4

3 4. When 20 cm 3 of a gaseous hydrocarbon was completely burnt in an excess of oxygen, 60 cm3 of carbon dioxide and 60 cm 3 of water vapour were formed, all volumes being measured at the same temperature and pressure. What is the molecular formula of the hydrocarbon? A CH 2 B C 2H6 C C 3H6 D C 3H8 5. Why is the first ionisation energy of sulphur lower than that of phosphorus? A Sulphur forms an anion more readily. B Sulphur is more electronegative than phosphorus. C The sulphur atom is larger than the phosphorus atom. D The electron to be lost is paired with another electron. 6. Which of the following ions will be deflected the least when passed through an electric field? A 2 24 12 Mg B 3 27 13 Al C 2 16 8 O D 3 31 15 P 7. X and Y are elements with the following succe ssive ionisation energies in kJ mol-1. X 580 1800 2700 11600 14800 18400 23300 Y 1310 3400 5300 7500 11300 13300 35000 What is the compound that is formed from element X and Y? A XY 4 B X2Y3 C X 3Y2 D X4Y [Turn Ove r]