Broadrick Prelim P1

1 6092/1/8/24 Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2024 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 August 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid Write your name, index number and class on the OTAS answer sheet. There are forty 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 separate Multiple Choice answer sheet. 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 use of an approved scientific calculator is expected, where appropriate. A copy of the Periodic Table is printed on page 14. This document consists of 14 printed pages including this page For Examiner’s Use 40

2 [Turn Over 6092/1/8/24 1 Which apparatus is not required in titration experiments? A burette B conical flask C measuring cylinder D white tile 2 Which conditions will give the highest rate of diffusion of a gas? relative molecular mass of gas temperature A high low B high high C low low D low high 3 Butyl ethanoate and water are two immiscible liquids with similar boiling points. Which method is most suitable to separate a mixture of water and butyl ethanoate? A evaporation to dryness B filtration C simple distillation D use a separating funnel

3 [Turn Over 6092/1/8/24 4 A paper chromatography experiment is used to find the Rf value for Fe2+(aq). The chromatogram is shown. To make the spot containing Fe2+(aq) more visible, the paper is sprayed with a locating agent that forms a precipitate of iron(II) hydroxide on the spot. In the chromatogram, the Rf of Fe2+(aq) is given by ….1…. and the colour of the precipitate is ….2…. . gap 1 gap 2 A 0.42 red-brown B 0.45 green C 0.50 red-brown D 0.55 green 5 Which technique is involved in all of the following processes? 1 obtaining copper(II) sulfate crystals from aqueous copper(II) sulfate 2 obtaining ethanol from the fermentation of glucose 3 obtaining nitrogen from liquid air A crystallisation B evaporation C filtration D fractional distillation solvent front Fe2+ 110 mm 20 mm start line 100 mm 55 mm

4 [Turn Over 6092/1/8/24 6 During a change in physical state at constant temperature and pressure:  average distance between the particles has a small change,  energy is released as stronger forces of attraction form between the particles. Which change of state is being described? A gas to solid B gas to liquid C liquid to solid D solid to liquid 7 X, Y and Z are elements. X and Y are in the same period of the Periodic Table. Y and Z are in the same group of the Periodic Table. What are the possible electronic configurations for X, Y and Z? X Y Z A 2,1 2,7 2,8,4 B 2,1 2,8,1 2,8,8,1 C 2,4 2,8,4 2,8,7 D 2,8,4 2,8,7 2,7 8 In which molecule are all the outer electrons of the atoms involved in bonding? A CO2 B CH4 C HBr D NH3 9 Which substance has a giant ionic lattice structure at room temperature? A graphite B methane C potassium oxide D water

5 [Turn Over 6092/1/8/24 10 Diamond and graphite are different allotropes of carbon. Which row describes the uses of diamond and graphite? use to perform drilling as an electrode as a lubricant A diamond graphite graphite B diamond diamond diamond C graphite diamond graphite D graphite graphite diamond 11 Which pair of substances is able to conduct electricity due to the presence of mobile ions? A aqueous potassium nitrate and molten potassium nitrate B aqueous potassium nitrate and solid potassium metal C solid graphite and solid potassium metal D solid graphite and molten potassium nitrate 12 What is the ionic equation for the reaction between aqueous potassium carbonate and dilute nitric acid? A H+(aq) + OH-(aq)  H2O(l) B 2K+(aq) + NO3-(aq)  H2O(l) C CO32-(aq) + 2H+(aq)  CO2(g) + H2O(l) D 2NO3-(aq) + 2H+(aq)  2CO2(g) + H2O(l) 13 Ammonia is manufactured from nitrogen and hydrogen by the Haber process. N2(g) + 3H2(g) ⇌ 2NH3(g) What is the percentage yield when 30 kg of ammonia is produced from 30 kg of hydrogen? A 5.9% B 17.6% C 35.3% D 66.7%

6 [Turn Over 6092/1/8/24 14 Which hydrocarbon has the highest percentage of hydrogen by mass? A CH4 B C3H8 C C4H10 D C5H12 15 What is a property of halogens? A their atoms decrease in size down the group B their melting points increase down the group C they conduct electricity in the solid state D their silver salts are all soluble in water 16 Which property is common to 40Ca, 39K and 24Mg? A they sink when added to water B their atoms have more neutrons than protons C their ions have eight electrons in the outermost shell D they are deposited at the anode when their molten chloride is electrolysed 17 Three statements about the elements carbon, nitrogen and sulfur are shown. 1 They are found in groups next to each other in the Periodic Table. 2 Their proton to neutron ratios are all one to two. 3 They can form acidic oxides. Which of the statements is/are true? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

7 [Turn Over 6092/1/8/24 18 Helium and xenon are both noble gases. What is true of both elements? they are chemically inert both atoms have eight electrons in their outer shell A ✓ ✓ B ✓ ✕ C ✕ ✓ D ✕ ✕ 19 Why is ethanoic acid considered as a weak acid? A It is a relatively poor conductor of electricity. B It dissociates partially in water. C It is an acid found in food. D It reacts with very reactive metals. 20 A student titrates aqueous sodium hydroxide from a burette with dilute hydrochloric acid in a conical flask. After the titration is complete, the conical flask is emptied. What is the correct procedure before the next titration? A Rinse out the conical flask with aqueous sodium hydroxide. B Rinse out the conical flask with dilute hydrochloric acid. C Rinse out the conical flask with distilled water. D Use the conical flask again without rinsing 21 A white precipitate formed after the addition of dilute nitric acid and aqueous silver nitrate to unknown solution Y. What could the unknown solution Y be? A barium nitrate B calcium carbonate C copper(II) chloride D potassium sulfate

8 [Turn Over 6092/1/8/24 22 Which pair of chemicals is most suitable to prepare a pure sample of copper(II) nitrate? chemical 1 chemical 2 A copper dilute nitric acid B copper aqueous potassium nitrate C copper(II) carbonate dilute nitric acid D copper(II) carbonate aqueous potassium nitrate 23 Ammonia gas is produced using the Haber process. Which statement best explains why a higher temperature of 450 oC is used although a lower temperature of 250 oC produces a higher yield of ammonia. A At 250 oC, smaller volume of ammonia will be collected. B At 250 oC, the rate of ammonia production is too low. C At 450 oC, the catalyst will be more effective. D At 450 oC, ammonia will be collected in the gaseous state. 24 The diagram shows the energy profile diagram for a chemical reaction. Which of the following can be deduced from the diagram? nature of reaction activation energy A endothermic P – R B endothermic P – Q C exothermic P – R D exothermic P – Q products reactants energy progress of reaction

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