UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level CHEMISTRY. Paper 1 Multiple Choice May/June 2004

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1 UNIVERSITY OF MRIGE INTERNTIONL EXMINTIONS General ertificate of Education Ordinary Level HEMISTRY 5070/01 Paper 1 Multiple hoice May/June 2004 dditional Materials: Multiple hoice nswer Sheet Soft clean eraser Soft pencil (type or H is recommended) 1 hour RE THESE INSTRUTIONS FIRST Write in soft pencil. o not use staples, paper clips, highlighters, glue or correction fluid. Write your name, entre number and candidate number on the answer sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. nswer all questions. For each question there are four possible answers,,, and. hoose the one you consider correct and record your choice in soft pencil on the separate answer sheet. Read the instructions on the nswer Sheet very carefully. Each correct answer will score one mark. mark will not be deducted for a wrong answer. ny rough working should be done in this booklet. copy of the Periodic Table is to be found on page 16. I04 06_5070_01/FP This document consists of 16 printed pages. [Turn over

2 2 1 queous hydrogen peroxide undergoes catalytic decomposition as shown in the equation below. 2H 2 O 2 (aq) 2H 2 O(l) + O 2 (g) The diagram shows part of the apparatus used to measure the rate of decomposition. X aqueous hydrogen peroxide catalyst Which piece of apparatus is connected at position X? burette gas syringe measuring cylinder pipette 2 mixture of two substances is spotted on to a piece of chromatography paper. The paper was inserted into a beaker containing a liquid. beaker chromatography paper liquid spot of mixture For separation of the substances to occur the mixture must be placed so that the spot is just below the level of the liquid. be soluble in the liquid. contain substances of the same R f values. contain substances that are coloured.

3 3 3 In a sample of air at 25 o, the molecules of oxygen, nitrogen and carbon dioxide all move with different average speeds. Which of the following lists the molecules in order of decreasing average speed? fastest slowest carbon dioxide oxygen nitrogen nitrogen oxygen carbon dioxide oxygen carbon dioxide nitrogen oxygen nitrogen carbon dioxide 4 Which of the following is the best method of obtaining pure water from ink? chromatography distillation filtration freezing 5 The relative molecular mass, M r, of copper(ii) sulphate, uso 4, is 160. The relative molecular mass, M r, of water is 18. What is the percentage by mass of water in copper(ii) sulphate crystals, uso 4.5H 2 O? 18 x x 18 x x x 18 x (5 x 18) [Turn over

4 4 6 solution of fertiliser was tested as shown. add excess aqueous sodium hydroxide solution moist red litmus paper turns blue fertiliser solution dirty green precipitate forms warm the mixture Which ions must be present in the fertiliser? NH + 4 and NO 3 NH + 4 and Fe 2+ Fe 2+ 2 and SO 4 Fe 3+ and NO 3 7 n element X has two isotopes, 238 X and 235 X. How does 238 X differ from 235 X? It has 3 more protons and 3 more electrons. It has 3 more protons, but no more electrons. It has 3 more neutrons and 3 more electrons. It has 3 more neutrons, but no more electrons.

5 5 8 The formulae of the ions of four elements are shown below. O 2 F Li + Mg 2+ Which statement about these ions is correct? They all have the same number of electrons in their outer shells. the same electronic structure as a noble gas. the same number of protons in their nuclei. more electrons than protons. 9 Which diagram represents the structure of sand, SiO 2? key Silicon atom Oxygen atom 10 What happens when sodium chloride melts? ovalent bonds in a giant lattice are broken. Electrons are released from atoms. Electrostatic forces of attraction between ions are overcome. Molecules are separated into ions. [Turn over

6 6 11 In the circuit below, the lamp lights up. lamp electrodes substance X What could X be? a solution of ethanol in water a solution of sodium chloride in water liquid ethanol solid sodium chloride 12 The formula of china clay (aluminium silicate) was shown in an old book as l 2 O 3.2SiO 2.2H 2 O. This formula is shown in a modern book as l 2 (OH) x Si 2 O y. What are the values of x and y in the modern formula? x y What is the concentration of iodine, I 2, molecules in a solution containing 2.54 g of iodine in 250 cm 3 of solution? 0.01 mol / dm mol / dm mol / dm mol / dm 3 14 The formula of an oxide of uranium is UO 2. What is the formula of the corresponding chloride? Ul 2 Ul 4 U 2 l U 4 l

7 7 15 The equation for the burning of hydrogen in oxygen is shown below. 2H 2 (g) + O 2 (g) 2H 2 O(g) Which information does this equation give about the reaction? 36 g of steam can be obtained from 16 g of oxygen. 2 g of hydrogen combine with 1 g of oxygen. 2 mol of steam can be obtained from 1 mol of oxygen. 2 atoms of hydrogen combine with 2 atoms of oxygen. 16 current was passed through concentrated aqueous potassium chloride, Kl, as shown. + _ concentrated aqueous potassium chloride Which entry in the table is correct? ions moving towards the cathode (-ve) the anode (+ve) K + only l and OH K + only l only K + and H + l only K + and H + l and OH [Turn over

8 8 17 When the experiment shown was set up, the bulb lit, but there were no decomposition products at the electrodes. lamp +ve _ ve electrodes X What is X? aqueous sodium chloride bromine molten sodium chloride mercury 18 Which of the following changes is endothermic? H(g) + l(g) Hl(g) H 2 O(g) 2H(g) + O(g) H 2 O(l) H 2 O(s) 2H 2 (g) + O 2 (g) 2H 2 O(l)

9 9 19 The diagram shows apparatus for measuring the volume of hydrogen given off when an excess of dilute hydrochloric acid is added to powdered metal. The volume of gas is measured at room temperature and pressure. dilute hydrochloric acid tap graduated tube metallic powder water The experiment is carried out three times, using the same mass of powder each time but with different powders: pure magnesium pure zinc a mixture of magnesium and zinc Which powder gives the greatest volume of hydrogen and which the least volume? greatest volume of H 2 least volume of H 2 magnesium zinc magnesium the mixture zinc magnesium zinc the mixture 20 Which change will increase the speed of the reaction between 1 mol of each of the gases, X and Y? a decrease in surface area of the catalyst a decrease in temperature a decrease in the volume of the reaction flask an increase in the volume of the reaction flask [Turn over

10 10 21 ilute hydrochloric acid was reacted with magnesium ribbon and the volume of hydrogen gas evolved was measured for the first 80 s. 40 total volume of hydrogen produced / cm What was the average rate of production of hydrogen? time from start of reaction / s 0.4 cm 3 / s 2.5 cm 3 / s 4 cm 3 / s 40 cm 3 / s 22 Small portions of aqueous potassium iodide and of acidified, aqueous potassium manganate(vii) were added to four solutions. The colour changes seen are shown in the table. solution number potassium iodide potassium manganate(vii) 1 colourless to red purple to colourless 2 colourless to red no change 3 no change purple to colourless 4 no change no change Which solutions contained an oxidising agent? 1 only 1 and 2 only 1 and 3 only 2 and 4 only

11 11 23 The table gives information about three indicators. indicator low ph colour change high ph ph at which colour change takes place methyl orange red yellow 4.0 bromothymol blue yellow blue 6.5 phenolphthalein colourless pink 9.0 If equal volumes of these three indicators were mixed, which colour would be observed at ph 5? blue green orange yellow 24 solution of hydrochloric acid has a concentration of 2 mol / dm 3. ifferent volumes of the acid are added to different volumes of aqueous sodium hydroxide. NaOH + Hl Nal + H 2 O The maximum temperature of each mixture is measured. The graph shows the results. temperature / o Hl / cm NaOH / cm 3 What is the concentration of the aqueous sodium hydroxide? 0.67 mol / dm mol / dm mol / dm mol / dm 3 [Turn over

12 12 25 Which method of preparation of a pure salt solution requires the use of a pipette and burette? al 2(aq) + H 2 SO 4 (aq) aso 4 (s) + 2Hl (aq) uo(s) + 2Hl (aq) ul 2(aq) + H 2 O(l) KOH(aq) + Hl (aq) Kl (aq) + H 2 O(l) MgO 3 (s) + H 2 SO 4 (aq) MgSO 4 (aq) + H 2 O(l) + O 2 (g) 26 Which statement about the manufacture of ammonia by the Haber Process is correct? The reactants and product are elements. The reactants and product are gases. The reactants and product are compounds. The reactants are both obtained from the air. 27 Which of the following occurs in the ontact process? Sulphur dioxide is dissolved in water. Sulphur trioxide is dissolved in water. Sulphur dioxide is dissolved in dilute sulphuric acid. Sulphur trioxide is dissolved in concentrated sulphuric acid. 28 The diagrams show the arrangements of the electrons of four elements. element 1 element 2 element 3 element 4 Which two elements are metals? 1 and 2 1 and 3 2 and 4 3 and 4

13 29 Sodium, aluminium and sulphur are in the same period of the Periodic Table. 13 What trend in types of oxide occurs across this period? left right acidic amphoteric basic amphoteric basic acidic basic acidic amphoteric basic amphoteric acidic 30 Use the Periodic Table to decide which element has all four of the properties shown. high melting point variable oxidation states good electrical conductivity forms coloured compounds caesium, s cobalt, o iodine, I strontium, Sr 31 Iron rusts when exposed to oxygen in the presence of water. Which of these methods will not slow down the rate of rusting of an iron roof? attaching strips of copper to it coating it with plastic galvanising it with zinc painting it 32 Why does aluminium have an apparent lack of reactivity? luminium has a coating of aluminium oxide, preventing further reaction. luminium has a giant molecular structure that is too hard to break. luminium is low in the reactivity series. The activation energy for the reaction of aluminium with other elements is too high. [Turn over

14 14 33 Which oxide can be reduced to the metal by hydrogen? calcium oxide copper(ii) oxide magnesium oxide sodium oxide 34 The data gives the concentration, in parts of pollutant per billion parts of air, of polluting gases in four different industrialised cities. In which city are limestone buildings under greatest threat from pollution? city sulphur dioxide nitrogen dioxide ozone The water in a lake contains the following dissolved substances. mineral salts nitrates oxygen phosphates sewage How many of these substances can cause eutrophication? The equation represents the conversion of starch to a simple sugar. ( 6 H 10 O 5 ) n + n H 2 O n 6 H 12 O 6 starch simple sugar This reaction is an example of condensation. hydrogenation. hydrolysis. polymerisation.

15 15 37 Methane, H 4, the first member of the alkane homologous series, has a boiling point of 161 o. Which molecular formula and boiling point could be correct for another alkane? molecular formula boiling point / o 2 H H H H student carries out three tests on a gas X. test damp red litmus paper aqueous bromine lighted splint results stays red stays brown gas burns Which gas could be X? ammonia ethene methane oxygen 39 n organic compound, Y, reacts with sodium hydroxide to give a compound with formula 3 H 5 O 2 Na. What is compound Y? ethanol propane propanoic acid propanol 40 Which compound has an addition reaction with chlorine? 2 H 4 2 H 6 2 H 5 OH H 3 O 2 H

16 16 T SHEET The Periodic Table of the Elements Group I II III IV V VI VII H Hydrogen 2 4 He Helium 3 7 Li Lithium 4 9 e eryllium 5 11 oron 6 12 arbon 7 14 N Nitrogen 8 16 O Oxygen 9 19 F Fluorine Ne Neon Na Sodium Mg Magnesium l luminium Si Silicon P Phosphorus S Sulphur l hlorine r rgon K Potassium a alcium Sc Scandium Ti Titanium V Vanadium r hromium Mn Manganese Fe Iron o obalt Ni Nickel u opper Zn Zinc Ga Gallium Ge Germanium s rsenic Se Selenium r romine Kr Krypton Rb Rubidium Sr Strontium Y Yttrium Zr Zirconium Nb Niobium 96 Mo Molybdenum Tc Technetium Ru Ruthenium Rh Rhodium Pd Palladium g Silver d admium In Indium Sn Tin Sb ntimony Te Tellurium I Iodine Xe Xenon s aesium Fr Francium a arium 226 Ra Radium 139 La Lanthanum 57 * c ctinium Hf Hafnium Ta Tantalum W Tungsten Re Rhenium Os Osmium Ir Iridium Pt Platinum u Gold Hg Mercury Tl Thallium Pb Lead i ismuth 84 Po Polonium 85 t statine 86 Rn Radon *58-71 Lanthanoid series ctinoid series Key b a X a = relative atomic mass X = atomic symbol b = proton (atomic) number e erium 232 Th Thorium 141 Pr Praseodymium 59 Pa Protactinium Nd Neodymium 238 U Uranium Pm Promethium Np Neptunium Sm Samarium Pu Plutonium Eu Europium m mericium Gd Gadolinium m urium Tb Terbium k erkelium y ysprosium f alifornium Ho Holmium Es Einsteinium Er Erbium Fm Fermium Tm Thulium Md Mendelevium Yb Ytterbium No Nobelium Lu Lutetium Lr Lawrencium 103 The volume of one mole of any gas is 24 dm 3 at room temperature and pressure (r.t.p.). University of ambridge International Examinations is part of the University of ambridge Local Examinations Syndicate (ULES) which is itself a department of the University of ambridge.