NYGH 2010-S3BT1-Chem

Class Register Number Name 南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL BLOCK TEST 1 Secondary Three CHEMISTRY 1 hour Tuesday 4 May 2010 0745-0845 h READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Section A (Multiple Choice) Section A (15 MCQ) This section consists of 15 multiple choice questions. Choose the best answer and write its letter in the space provided on page 6 of the Question Paper. Section B (Structured) Answer All questions in the spaces provided on the Question Paper. Section C (Free-Response) Answer All questions in the spaces provided on the Question Paper. Submit Sections A, B and C together. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 11. Examiner’s Use Section A (15 marks) Section B (20 marks) Section C (10 marks) Total (45 marks) Setter: ET This document consists of 11 printed pages. NANYANG GIRLS' HIGH SCHOOL [ Turn over]

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry 2 Section A (15 marks) Choose the most suitable answer and write its letter in the answer table provided on Page 6. 1 Copper(II) sulfate crystals can be s eparated from sand using the four processes listed below. The order in which these processes should be used is 1st 2 nd 3 rd 4 th A filtration solution crystallization evaporation B solution evaporation filtration crystallization C filtration solution evaporation crystallization D solution filtration evaporation crystallization 2 A drug was tested for purity through ch romatography using propanol as the solvent. If the drug has an R f value of 0.60, at whic h point should the spot be found? 3 The elements T, X and Y have consecutive, increasing atomic numbers. If element T is noble gas, what will be the symbol for the ion of element Y in its compounds? A Y3+ C Y+ B Y2- D Y2+ 4 The number of valence electr ons of atoms of elements W, X, Y, Z are 7, 1, 6, and 2 respectively. Which of the follo wing represents the correct chemical formulae when these elements react? A W2Z, Y2X B Z2W, X2Y C ZW2, X2Y D WZ2, YX2

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry [Turn Over] 3 5 In which one of the following sets do all 3 particles have the same total number of electrons? A CI ─, Br─,I─ B F─, Ne, Na+ C H─, H, H+ D S2-, SO3, SO3 2- 6 A stable molecule containi ng atoms of the elements X, Y and Z has the following structure. What are the elements X, Y and Z? X Y Z A Sulfur Aluminium Hydrogen B Nitrogen Carbon Hydrogen C Carbon Nitrogen Chlorine D Silicon Phosphorus Oxygen 7 The diagram shows the arrangement of ions in a compound. The metal ions (M) are represented by ● and the non-metal ions (X) by O. What is the simplest formula of this compound? A M14X13 C MX B M2X D MX6 8 What is the number of shared electrons in a carbon dioxide molecule? A 8 B 4 C 2

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry 4 D 0 9 What is formed when an element X of atomic number 19 reacts with an element Y of atomic number 17? A a covalent compound of formula XY B a covalent compound of formula XY2 C an ionic compound of formula XY D an ionic compound of formula X2Y 10 Which structural feature of graphite best accounts for its use as a lubricant? A delocalized electrons B hexagonal arrangement of carbon atoms C strong covalent bonds within layers D weak Van der Waals’ forces between layers 11 The labels fell off from two bottles, each containing a colourless solution, one of which was aqueous lead(II) nitrate and the other was aqueous aluminium nitrate. Which of the following reagents could be used to distinguish between the two solutions? i addition of dilute hydrochloric acid ii addition of aqueous ammonia iii addition of aqueous potassium iodide iv addition of aqueous sodium hydroxide A i and ii B ii and iii C i and iii D i, ii and iii 12 Solution X contains a simple salt. The table shows the results of some tests on solution X. Test Observation addition of aqueous sodium hydroxide green precipitate formed addition of acidified barium nitrate white precipitate formed What is the name of the salt in solution X? A iron(II) chloride B iron(III) chloride C iron(II) sulfate D iron(III) sulfate

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry [Turn Over] 5 13 Refer to the scheme below to identify the unknown. Which of the following could be solid X? Solid X Gas Z A Sodium hydroxide Water vapour B Calcium hydroxide Water vapour C Zinc nitrate Ammonia D Aluminium nitrate Ammonia Excess aqueous ammonia Excess aqueous potassium hydroxide and aluminium foil; warm 14 Which one of the following statements about t he reactions of dilute hydrochloric acid, dilute nitric acid and dilute sulfuric acid is correct for all three acids? A They react with copper to produce hydrogen gas. B They react with zinc hydroxide to produce hydrogen gas. C They react with aqueous sodium carbonate to produce carbon dioxide gas. D They react with aqueous silver nitrate to give a precipitate. 15 Four particles are present in dilute sulfuric acid. Which particle is present in the lowest concentration? A the hydroxide ion, OH─(aq) B the hydrogen ions, H+ (aq) C the sulfate ion, SO4 2─(aq) D the water molecule, H2O(I)

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry 6 Section A (15 Marks) Answer the questions (1-15) by filling the answer in the table below. 1 6 11 2 7 12 3 8 13 4 9 14 5 10 15 Section B (20 marks) Answer all questions in this section in the spaces provided B1 Use the following information to ans wer the questions below about the elements A, B, C, D and E. Substances Atomic Number Mass Number Electronic Structures A 3 7 2.1 B 18 40 2.8.8 C 8 16 2.6 D 12 24 2.8.2 E 19 39 2.8.8.1 (a) Which element has 22 neutrons in each atom? [1] (b) Is the bonding between C and E ionic or covalent? [1] (c) Which element is a noble gas? [1] (d) Which two elements form ions with the same electronic structure as neon (2.8)? [2] (e) Which two elements are in the same Group in the Periodic Table of the elements? [2]

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry [Turn Over] 7 B2 (a) Draw a ‘dot-and-cross’ diagram (showing only valence electrons) to show the bonding in (i) sodium fluoride [2] (ii) fluorine [2] (b) Explain why sodium fluoride has a higher melting point than fluorine. [2]

2010 Secondary Three Block Test 1 Nanyang Girls’ High School Setter: ET Chemistry 8 B3 The following table summarizes the result s of tests which were carried out on aqueous solutions of compounds C and D. C D Dilute sodium hydroxide solution No visible change. On warming, a gas was given off which turned moist red litmus paper blue. Green precipitate was formed. On standing, the green precipitate turned red-brown. Acidified barium chloride solution White precipit