2024 ANDSS 4E Chem Prelim P1 QP

This document consists of 17 printed pages and 1 blank page. O ANDERSON SECONDARY SCHOOL Preliminary Examination Secondary Four Express CANDIDATE NAME: CLASS: / INDEX NUMBER: CHEMISTRY Paper 1 Multiple Choice 6092/01 23 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. There are forty questions on 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 pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. 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. A copy of the Periodic Table is printed on Page 18. The use of an approved scientific calculator is expected, where appropriate.

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 2 1 When heated, magnesium undergoes combustion to form magnesium oxide, a white powder. A student investigates the change in mass that occurs during this reaction. The student is given a balance and three sets of apparatus as shown. Which sets of apparatus are suitable for this investigation? A 1, 2 and 3 B 1 and 3 C 2 and 3 D 2 only 2 The results of a paper chromatography experiment are shown , which is not drawn to scale. X is an aqueous solution of a salt of a Group 1 element. Y is an aqueous solution of a salt of a transition element. Which row is correct? larger Rf value requires a locating agent A X X B X Y C Y X D Y Y 1 2 3 metal tongs burning magnesium air heat magnesium magnesium metal tongs crucible tripod stand solvent front baseline

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 3 3 A laboratory has a powdered mixture of solid iodine and solid carbon. Iodine is very soluble in hexane and slightly soluble in water. Carbon is insoluble in both solvents. One sample of the mixture is shaken with hexane. This is P. Another sample of the mixture is shaken with water. This is Q. Which procedure is used to prepare a pure sample of iodine? A P is distilled and the distillate is evaporated to dryness. B P is filtered and the filtrate is allowed to evaporate to dryness. C P is filtered and the residue is allowed to evaporate to dryness. D Q is distilled and the distillate is evaporated to dryness. 4 Mineral wool soaked in aqueous ammonia is placed in the apparatus shown. After 5 minutes, the damp red litmus paper turns blue. Which process led to this change? A condensation B crystallisation C diffusion D fractional distillation mineral wool soaked in aqueous ammonia damp red litmus paper

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 4 5 Stearic acid has a melting point of 69°C. A heated sample of pure stearic acid is cooled, and the temperature is recorded every minute for 30 minutes. A graph of the results is shown. Which process occurs between 8 and 12 minutes? A boiling B condensing C freezing D melting 6 The number of electrons, protons and neutrons in four different particles are shown. particle electrons protons neutrons 1 19 19 20 2 18 19 20 3 20 20 20 4 19 19 22 Which particles are isotopes of the same element? A 1 and 2 B 1 and 3 C 1 and 4 D 1, 2 and 3

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 5 7 Element E and element G react together to form a compound. The electronic configurations of E and G are 2,8,3 and 2,6 respectively. Which row is correct? element E element G type of compound A 2 atoms each loses 3 electrons 3 atoms each gains 2 electrons covalent B 2 atoms each loses 3 electrons 3 atoms each gains 2 electrons ionic C 2 atoms each gains 3 electrons 3 atoms each loses 2 electrons covalent D 2 atoms each gains 3 electrons 3 atoms each gains 2 electrons ionic 8 Which substance has a giant covalent structure and contains atoms of more than one element? A ammonia B diamond C graphite D silicon dioxide 9 Three statements about the properties of metals are shown. 1 All metals conduct electricity. 2 All metals have 2 electrons in their innermost shell. 3 All metals have high melting points. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3 10 Element J forms a positive ion when it reacts with oxygen. Using the Periodic Table, how many protons are in atom J? A 6 B 10 C 16 D 20

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 6 11 The diagram shows the structure of boron nitride. Which statement about boron nitride is correct? A It has a low melting point. B It has an ionic lattice. C It has the same structure as diamond. D It can be used as a lubricant. 12 Three compounds are listed. • calcium carbonate • potassium sulfate • zinc nitrate Which row shows the element present in the greatest percentage by mass in each compound? element present in the greatest percentage by mass in calcium carbonate element present in the greatest percentage by mass in potassium sulfate element present in the greatest percentage by mass in zinc nitrate A calcium oxygen oxygen B calcium oxygen zinc C oxygen potassium zinc D oxygen potassium oxygen key: boron nitrogen

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 7 13 Samples of two hydrated compounds are weighed and then dehydrated by heating. The anhydrous compounds are weighed and the results are shown. 3.97g FeSO4.xH2O gives 2.17g anhydrous FeSO4. 2.88g CaSO4.yH2O gives 2.27g anhydrous CaSO4. What are the values of x and y? [Mr: FeSO4, 152; CaSO4, 136; H2O, 18] x y A 5 2 B 5 5 C 7 5 D 7 2 14 50.0 cm3 of 0.10 0 mol/dm3 silver nitrate , AgNO 3, is added to 150.0 cm 3 of 0.0500 mol/dm3 sodium iodide, NaI, in a beaker. After the reaction, solid silver iodide is present in the beaker. What else is present? A aqueous silver nitrate and aqueous sodium nitrate B aqueous sodium iodide and aqueous sodium nitrate C aqueous sodium iodide only D aqueous sodium nitrate only 15 Aqueous hydrogen peroxide, H2O2, decomposes slowly at 25oC. 2H2O2(aq) → 2H2O(l) + O2(g) The decomposition reaction takes place faster when a catalyst is added. A student adds a small amount of catalyst to 10 cm 3 of 1.00 mol/dm 3 of aqueous hydrogen peroxide and collects the gas that is produced. The volume of gas collected is 90 cm3. All measurements are made at room temperature and pressure. What is the percentage yield of oxygen? A 28.1% B 37.5% C 56.3% D 75.0%

PRELIM EXAM 4E CHEMISTRY P1 2024 6092/01 8 16 What is a chemical product of a hydrogen-oxygen fuel cell? A electricity B hydrogen C oxygen D water 17 Which method of preparation of magnesium sulfate is an example of redox reaction? A Mg + H2SO4 → MgSO4 + H2 B MgO + H2SO4 → MgSO4 + H2O C Mg(OH)2 + H2SO4 → MgSO4 + 2H2O D MgCO3 + H2SO4 → MgSO4 + H2O + CO2 18 Which diagram represents the ionisation of a weak acid? A B C D