EXAMINATIONS COUNCIL OF SWAZILAND Swaziland General Certificate of Secondary Education

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1 EXAMINATIONS COUNCIL OF SWAZILAND Swaziland General Certificate of Secondary Education CANDIDATE NAME CENTRE NUMBER CANDIDATE NUMBER PHYSICAL SCIENCE 6888/01 Paper 1 Short Answers October/November hour Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. You may use an electronic calculator. You may lose marks if you do not show your working or if you do not use appropriate units. A copy of the Periodic Table is printed on page 10. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question This document consists of 10 printed pages and 2 blank pages. [Turn over

2 2 1 Fig. 1.1 shows the apparatus that can be used to separate three liquids: cooking oil, hexane and water. A B C (a) Name the apparatus shown in Fig Fig [1] (b) Table 1.1 shows the densities of the liquids. Identify liquids A and C Table 1.1 liquid density g / cm 3 cooking oil 0.92 hexane 0.65 water 1.00 A... C... [2] 2 An avocado falls from a tree to the ground. Fill in the missing terms in the paragraph below which explain the energy changes that take place when the avocado falls from the tree. When the avocado is attached to the tree it has. energy. As it falls this energy is converted to. energy. When it hits the ground the energy is converted into. and.. [2] 3 One source of energy that can be used is the energy from hot rocks deep underground. Name this energy source.... [1]

3 4 Liquid water can change state. 3 (a) Name the process which occurs (i) when water changes into ice,... [1] (ii) when water changes into steam.... [1] (b) Fig. 4.1 shows crushed ice being heated at a constant rate with an immersion heater. immersion heater crushed ice glass beaker Fig. 4.1 The graph in Fig. 4.2 shows the average kinetic energy of the molecules as the ice is heated. average kinetic energy per molecule Y Y Fig. 4.2 time State what is happening to the ice during the period XY [1] [Turn over

4 4 5 A student hears an echo when she shouts in an empty hall. State what is meant by an echo.... [1] In questions 6 to 8 inclusive, circle the correct answer. 6 Which of the following shows the correct formulae for methane and propene? A CH 4 and C 2 H 4 B CH 4 and C 3 H 6 C C 2 H 6 and C 3 H 6 D C 2 H 6 and C 4 H 8 [1] 7 A current carrying wire is wrapped around an iron core. Which piece of apparatus has been made? A B C electric motor electromagnet generator D permanent magnet [1] 8 An element X, is composed of molecules, X 2. Element X forms a gaseous hydride, HX and a compound, AgX. Which of the following statement(s) can be deduced from the above information? 1 X is a non-metal. 2 A solution of HX is alkaline. 3 X displaces fluorine from silver fluoride solution. A B C D 1 only 1 and 2 2 and 3 1, 2 and 3 [1]

5 5 9 Fig. 9.1 shows a coin at the bottom of an open tin. A student, in the position shown in Fig. 9.1, cannot see the coin inside the open tin. open tin coin Fig. 9.1 After pouring water in the tin, the student can see the coin. open tin coin Fig. 9.2 (a) Draw a ray on Fig. 9.1 to show why the student cannot see the coin. Draw the ray leaving the coin. [1] (b) Draw a ray on Fig. 9.2 to show that the student can now see the coin after pouring water in the tin. Draw the ray leaving the coin. [1] [Turn over

6 6 10 A student adds dilute sodium carbonate to dilute hydrochloric acid. A salt, carbon dioxide and water are formed. (a) Complete the equation for the reaction. [1] Na 2 CO HCl CO 2 + H 2 O (b) Calculate the relative formula mass (relative molecular mass, M r ) of sodium carbonate (Na 2 CO 3 ). [A r C = 12; A r O = 16; A r Na = 23; A r Cl = 35.5; A r H = 1] [2] 11 A glass ball gains a positive charge after it is rubbed with a silk cloth. Explain, in terms of electron movement, why the glass ball gains a positive charge [2] 12 Calcium carbonate is used in the extraction of iron from iron(iii)oxide. During this process, calcium carbonate decomposes due to high temperature, according to the following equation: CaCO 3 heat white solid + CO 2 (a) Name the white solid formed.... [1] (b) When water is added to the white solid an exothermic reaction occurs and an alkaline solution is formed. (i) State what is meant by the term exothermic.... [1] (ii) Describe how you can use an indicator to show that the solution formed is alkaline [2]

7 7 13 In cold weather, it is better to wear several thin layers of clothes rather than a single, thick layer. Explain why this is the case [2] 14 Rubidium metal reacts with chlorine gas to form rubidium chloride. (a) Describe how a rubidium atom forms a rubidium ion [1] (b) Draw the electronic structure of rubidium chloride. Show outer electrons only. [2] 15 Fig shows a circuit which includes a cell, two bulbs A and B and two meters Y and Z. point X A meter Y meter Z B Fig (a) an arrow to show the direction of conventional current flow at point X. [1] (b) Name meter Y and meter Z. meter Y... meter Z... [2] [Turn over

8 8 16 Fig shows a transverse wave on a spring. A direction of wave spring Fig Draw an arrow, in Fig. 16.1, to show the direction in which point A moves as the wave passes through it. [1] 17 Fig shows the reactions of three metals with dilute hydrochloric acid in test-tubes 1, 2 and Fig State and explain which test-tube contains a metal that is most likely to be extracted by electrolysis. test-tube... explanation [2]

9 9 18 Fig shows the scales of a micrometer screw gauge when it is used to measure the length of one side of a metal cube mm micrometer screw gauge Fig (a) Write down the length of the side of the cube.... cm [2] (b) The cube is then placed in a measuring cylinder containing 50 cm 3 of water so that it is completely submerged. Calculate the new level of the water in the measuring cylinder.... cm 3 [2] (c) Explain why a 0.5 kg cube of lead has a smaller volume than a 0.5 kg cube of copper [1] [Turn over

10 The volume of one mole of any gas is 24 dm 3 at room temperature and pressure (r.t.p.). b b = atomic (proton) number Key X X = atomic symbol 232 Th Thorium 90 Pa Protactinium 91 U Uranium 92 Np Neptunium 93 Pu Plutonium 94 Am Americium 95 Cm Curium 96 Bk Berkelium 97 Cf Californium 98 Es Einsteinium 99 Fm Fermium 100 Md Mendelevium 101 No Nobelium 102 Lr Lawrencium 103 a a = relative atomic mass * Lanthanoid series Actinoid series 140 Ce Cerium Pr Nd Praseodymium Neodymium Pm Promethium Sm Samarium Eu Europium Gd Gadolinium Tb Terbium Dy Dysprosium Ho Holmium Er Erbium Tm Thulium Yb Ytterbium Lu Lutetium 71 Fr Francium 87 Ra Radium Ac Actinium Cs Caesium Ba Barium La Lanthanum 57 * 178 Hf Hafnium Ta Tantalum W Tungsten Re Rhenium Os Osmium 76 Iridium Ir 195 Pt Platinum Au Gold Hg Mercury Tl Thallium Pb Lead 82 Bismuth Bi Po Polonium 84 At Astatine 85 Rn Radon Rb Rubidium Sr Strontium Y Yttrium Zr Zirconium Nb Niobium Mo Molybdenum 42 Tc Technetium Ru Ruthenium Rh Rhodium Pd Palladium Ag Silver Cd Cadmium 48 Indium In 119 Sn Tin Sb Antimony Te Tellurium 52 Iodine I 131 Xe Xenon K Potassium Ca Calcium Sc Scandium Ti Titanium V Vanadium Cr Chromium Mn Manganese Fe Iron Co Cobalt Ni Nickel Cu Copper Zn Zinc Ga Gallium Ge Germanium As Arsenic Se Selenium Br Bromine Kr Krypton Na Sodium Mg Magnesium Al Aluminium Si Silicon P Phosphorus S Sulfur Cl Chlorine Ar Argon Li Lithium 9 Be Beryllium 4 11 B Boron 12 C Carbon 14 N Nitrogen O Oxygen 19 F Fluorine 9 20 Ne Neon 10 1 H Hydrogen He Helium I II III IV V VI VII 0 Group DATA SHEET The Periodic Table of the Elements

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