NYGH 2010-S3EOY-Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2010 Secondary Three CHEMISTRY 45 minutes Paper 1 Multiple Choice Friday 15 October 2010 0800 - 0845 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, class and register number on the optical answer sheet provided. There are 30 questions in this paper. Answer all questions. For each question there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the optical answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is given on page 8. You are allowed to use an approved scientific calculator. Setter: CHG This document consists of 8 printed pages. NANYANG GIRLS' HIGH SCHOOL [ Turn over

End of Year Examination 2010 2 Nanyang Girls’ High School Secondary Three 1 At which temperature does a conc entrated aqueous solution of sodium chloride begin to boil? A 96oC C 100oC B 99oC D 104oC 2 Valeric acid is an organic liquid that is used as an industrial reactant to synthesize esters for use in perfume s and cosmetics. It does not mix with water. Which of the following apparat us below can be used to separate a mixture of valeric acid and water? A C B D 3 An element J forms a positive ion with an octet electronic configuration. The proton (atomic) number of J is most likely ______. A 16 C 18 B 17 D 19 4 Why do ionic compounds have high melting points? A Their ions are held in fixed positi ons in a crystal lattice and cannot move freely. B Their forces between the ions are very strong and need to be overcome by a large amount of energy. C The intermolecular forces between the ions are very strong and need to be overcome by a large amount of energy. D Ionic compounds behave like metals and thus have high melting points like most metals. 5 Hydrazine, used as a rocket pr opellant, has the formula N 2H4. What is the number of hydrogen atoms in 640 g of hydrazine? A 1.20 x 1023 C 1.25 x 1025 B 6.00 x 1023 D 4.80 x 1025 Setter: CHG Chemistry / I

End of Year Examination 2010 3 Nanyang Girls’ High School Secondary Three 6 A compound Y contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound Y? A SO C SO3 B SO2 D SO4 7 Which of the following contains the lowest concentration of hydrogen ions? A 2 mol/dm3 H2SO4 C 2 mol/dm3 CH3COOH B 2 mol/dm3 HCl D 2 mol/dm3 HNO3 8 The table gives information about three indicators. Indicator colo