NYGH 2011-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 Wednesday 6 April 2011 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: SChew This document consists of 11 printed pages. NANYANG GIRLS' HIGH SCHOOL [ Turn over]

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry 2 ection A (15 Marks)S (1-15) by filling the answer in the table below.Answer the questions 1 6 11 2 7 12 3 8 13 4 9 14 5 10 15 ection B (20 marks)S n this section in the spaces providedAnswer all questions i 1 The table shows the atomic structure of six particles, represented by the letters B L to Q. The particles are either atoms or ions. The letters are not the symbols of the elements. Particle Electrons Protons Neutrons L 6 6 6 M 2 2 2 N 12 12 12 O 10 12 12 P 6 6 8 Q 10 13 14 sing the letters L to Q, answer the following questions: U ) Which two particles are ions? [2](a (b) hich particle is an atom of a noble gas? ]W [1 (c) hich two particles are an atom and an ion of the ] W same element? [2 (d) hich two particles have the same electronic ] W structure as neon (2.8)? [2 (e) isotopes of the same [2] (f) rite out the formula of the compound formed [1] Which two particles are element? W when an atom of particle L reacts with oxygen.

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry [Turn Over] 3 B2 (a) alence electrons) to show the bonding in (i) de [2] i) oxygen gas [2] ) Explain why magnesium oxide has a higher melting point than oxygen gas? [2] Draw a ‘dot-and-cross’ diagram (showing only v magnesium oxi (i (b

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry 4 3 The following diagram was obtained from an analysis of naturally-occurring isotopes of chlorine. ) Define the term 'isotopes'. [1] B (a (b) sing the diagram, calculate the rela tive atomic mass of a sample f naturally occurring chlorine. [2] (c) hat is the difference between Chlorine-37 and Chlorine-35? [1] U o W ☺ END OF SECTION B ☺

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry [Turn Over] 5 Section C (10 marks) C1 silicon carbide are both macromolecules. Part of the ilicon carbide is shown below. (i) cture of silicon carbide and diamond. [2] (a) Diamond and structure of s State one difference between the stru (ii) tate one similarity between the structure of silicon carbide and diamond. ] S [1 (iii) uggest two physical proper ties of silicon carbide. ] S [2

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry 6 ) not r compound of silicon, silicon(IV) oxide, SiO 2, has a giant tructure of atoms. Sodium chloride, NaCl, on the other hand has a 2, has a simple olecular structure. [1] (ii) escribe a test which you could use to decide whether a ubstance has a giant structure or a molecular structure. [2] (b A he s giant structure of ions. The element, iodine, I m (i) Draw a dot and cross diagram (showing only the valence electrons) of the element, iodine, I2. D s (iii) escribe a test which you could use to decide whether a structure is made up of atoms or ions. ] D substance with a giant [2 ☺END OF TEST☺

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry [Turn Over] 7 ect n A 5 m rks)S io (1 a Choose the most suitable answer and write its letter in the answer table prov ed o Pa e 2.id n g 1 A pure and dry sample of c be obtained fr om a mixture of copper(II) sulfate and chalk by using the four processes listed below. these processes should be used is crystallization evaporation dissolving h phy exp rried drop o of an y ver. Th wn e can conclude copper, nickel and zinc. copper, silver and zinc. a over a large range of temperatures. w n heating solid X solidifies at one B a mixture of compounds miscible in the liquid state. opper(II) sulfate can The order in which A filtration B dissolving evaporation cr ystallization filtration C dissolving filtration ev aporation crystallization dissolving D filtration evaporation cryst allization 2 A c romatogra eriment was ca ho out using a f a solution allo , German sil e results is s below: W that the metals present in German silver are aluminium, copper and nickel. aluminum, nickel and silver. A B C D 3 A s mple of solid X melts gradually oHo ever, the liquid that is formed st likely contains temperature. This sample mo A a pure compound. C a mixture of two or more compounds that combine to form a new compound when solid X was melted. D a mixture of compounds immiscible in the liquid state.

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry 8 c 40 seconds. How long l ditions of tem A 10 seconds C 40 seconds B 20 seconds D 80 seconds 5 T a nt temperatures. hich substan Melting A B C D Carbon has isotopes with the relative atomic masses of 12, 13 and 14. If tha d from opes, w ich of th e following is t ible relative molecular mass of ethane? C 34 D 35 7 Protons Neutrons 18 16 16 16 D 20 14 4 20 m3 of ethene (C2H4) diffused through a porous pot in wil it take for 40 cm 3 of nitrogen gas to diffuse under the same con perature and pressure? he diagrams show the particle arrangement in a substance at a pressure of 1 tmosphere but at two differe W ce could the diagrams represent? Point/ oC Boiling Point/ oC -183 -69 -169 -104 -135 -0.5 -115 -85 6 e ne (C 2H6) is forme these carbon is ot h no a poss A 32 B 33 An anion T 2- has 34 nucleons and 18 electr ons. How many protons and neutrons does the nucleus of T contain? A 16 18 B C

2011 Block Test 1 Nanyang Girls’ High School Secondary Three Setter: SChew Chemistry [Turn Over] 9 i mber of protons as the hydroxide ion, OH-? A O2- C Na+ B F- D Mg2+ If the formula of radium chloride is RaC l2 and the formula of sodium phos