NYGH 2012-S3EOY-Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2012 Secondary Three CHEMISTRY 45 minutes Paper 1 Multiple Choice 0800 to 0845 Thursday 11 October 2012 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are thirty 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 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. The periodic table can be found on page 12. Setter: HSC This document consists of 12 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2012 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: HSC Chemistry / I 1 The diagram shows the arrangement of particles in three different states of substance X. state 1 state 2 state 3 Which statement best describes the physical states of substance X? A State 1 changes to state 2 by diffusion. B Particles in state 1 vibrate about fixed positions. C State 2 changes directly to state 3 by sublimation. D Substance in state 1 has a fixed volume. 2 The diagram shows the chromatogram obtained by analysis of a single dye. Three measurements are shown. What is the distance travelled by the dye? A y B z C x + y D y + z

2012 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: HSC Chemistry / I [Turn over 3 The table shows some information about three substances. Substance Melting point / oC Boiling point / oC Solubility in water P 6.5 178 Soluble Q − 14 85 Soluble R 125 350 Insoluble The following operations could be carried out to separate a mixture of P, Q and R. 1. filtration; 2. fractional distillation; 3. evaporation; 4. add water. In which order should the operations be carried out? A 4, 1, 2 (omit stage 3) B 2, 4, 3 (omit stage 1) C 2, 4, 1 (omit stage 3) D 4, 1, 2, 3 4 A balloon filled with gas X is placed inside a beaker. The beaker is filled with gas Y. The balloon shrinks in size after a few hours. Which pair of gases would give the observation as shown in the diagram? gas X gas Y A air nitrogen B argon carbon dioxide C oxygen nitrogen D ammonia methane 5 The bonding electrons of a compound formed between Y and fluorine is shown below: What is the formula of the compound formed between calcium and Y? A CaY B Ca5Y2 C Ca2Y3 D Ca3Y2 after a few hours gasX gasY

2012 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: HSC Chemistry / I 6 The equation shows the reaction between hydroxide of the metallic element X and dilute hydrochloric acid. X(OH)2(aq) + 2HCl(aq) → XCl2(aq) + 2H2O(l) Which particles are responsible for the electrical conductivity in X, X(OH)2 and XCl2? X X(OH)2 XCl2 A electrons electrons cations and anions B electrons cations and anions cations and anions C cations electrons electrons D cations and anions anions cations 7 The diagram below shows the particle arrangements of four different substances. + + + + + + + + + + - -- -- -- - - - - - - - - --- --- i ii iii iv Which one of the following descriptions most likely identify with the above substances? i ii iii iv A have strong covalent bonds have delocalized electrons have van der Waals’ forces have strong covalent bonds B have van der Waals’ forces have strong ionic bonds Have strong covalent bonds have van der Waals’ forces C have van der Waals’ forces have delocalized electrons have van der Waals’ forces have strong ionic bonds D have delocalized electrons have van der Waals’ forces have delocalized electrons have strong ionic bonds 8 A solution of a fertilizer was analyzed. When excess aqueous sodium hydroxide was added to the solution, a green precipitate was observed. When the mixture was further warmed, a gas that turned moist red litmus blue was given off. Which ions are present in the fertilizer solution? A Fe 2+ and NH4 + B Fe2+ and NO3 - C NH4 + and NO3 - D Fe2+ and Cu2+

2012 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: HSC Chemistry / I [Turn over 9 The chemical reaction below shows the reaction between X(OH)2 and dilute sulfuric acid. X(OH)2(s) + H2SO4(aq) → XSO4(aq) + H2O(l) What could X(OH) 2 be? A calcium hydroxide B iron(II) hydroxide C barium hydroxide D aluminium hydroxide 10 What is the mass of one molecule of ethane,C 2H6 ? A 3 × 10-23 g B 5 × 10-23 g C 0.03 g D 30 g 11 Ammonia burns in oxygen according to the following equation. 4NH 3(g) + 3O2(g) → 2N2(g) + 6H2O(l) What is the total volume of gas left in the final mixture when 40 cm 3 of ammonia reacts with 60 cm3 of oxygen? (All volumes measured at room temperature and pressure) A 20 cm3 B 30 cm3 C 50 cm3 D 110 cm3 12 The concentration of hydroxide ions, OH -, can be determined by titration with sulfuric acid, H2SO4, or nitirc acid, HNO 3. An analyst found that a sample of hydroxide solution required 20.0 cm3 of 0.100 mol/dm 3 of sulfuric acid for complete reaction. If the analysis had been carried out with 0.200 mol/dm3 of nitric acid, what possible volume of nitric acid would have been required for complete reaction with the hydroxide solution? A 10.0 cm3 B 15.0 cm3 C 20.0 cm3 D 25.0 cm3

2012 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: HSC Chemistry / I 13 The ionic equation for the reaction of silver ions and chloride ions is shown below. Ag +(aq) + Cl-(aq) → AgCl(s) It was found that 50.0 cm 3 of 0.05 mol/dm 3 of silver nitrate was needed to react completely with 25.0 cm 3 of 0.05 mol/dm 3 of chloride solution of metal M. What is the molecular formula of metal M? A MCl B MCl2 C M2Cl D MCl3 14 When chlorine gas is passed over a heated metal M, a reaction occurs to produce a compound Q. Some information about M and Q is given below. • Formula of Q is M xCly. • A r of M is 56. • 1.90 of Mass chlorine of Mass =M What are the values of x and y? x y A 1 3 B 3 1 C 1 2 D 3 2 15 Which of the following statements are true for Mg2+ and F- ? i. They have the same number of electrons. ii. They have the same mass number. iii. Magnesium ion has more neutrons than fluoride ion. A i and ii only. B i and iii only. C i only D i, ii and iii 16 Which of the following does not have the same number of electrons as a sulfide ion, S 2-? A BeF2 B Ar C H2S D P3-

2012 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: HSC Chemistry / I [Turn over 17 The labels from three bottles of solutions, A, B and C which contain either lead(II) nitrate, zinc sulfate or aluminium chloride have dropped. Which of the following group of reagents when used separately, can be used to identify the three solutions? A aqueous ammonia and potassium iodide solution B silver nitrate solution and sodium hydroxide solution C aqueous ammonia and barium nitrate D aqueous ammonia and sodium hydroxide solution 18 The atoms 14C and 14N A have the same chemical properties. B are isotopes. C have the same total number of electrons and neutrons. D have the same total number of electrons and protons.