2022 EFSS Chem Prelims P1

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA [Turn over FOR EXAMINER’S USE My target grade/mark: _________ TOTAL / 40 Parent’s signature This document consists of 18 printed pages. Candidate Name: Candidate Index Number: Class: CHEMISTRY Paper 1 Multiple choice 6092/01 August 2022 Additional Materials: Multiple Choice Answer Sheet 1 hour EDGEFIELD SECONDARY SCHOOL 2022 Preliminary Examination Secondary 4 Express READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, name and class register number in the above boxes. 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 soft 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. O Syllabus ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA 2 1 The following diagram shows an experimental setup used by a student to prepare carbon monoxide from charcoal. What should the student do to obtain a purer yield of carbon monoxide? A Use dilute sulfuric acid instead of dilute hydrochloric acid so that hydrogen chloride gas will not be formed. B Bubble the stream of gas from X into a flask containing drying agent before collection. C Pass the stream of gas from X through a filtering system to remove soot produced from charcoal. D Pass the stream of gas from X into a flask containing aqueous sodium hydroxide before collection. 2 How many of the molecules shown contain only one single covalent bond? Cl2 H2 N2 O2 CO2 A 1 B 2 C 3 D 4 ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA [Turn over 3 3 The apparatus is set up, using different gases in the two inverted beakers. Which pair of gases would cause an upward movement of the water level at U? gas 1 gas 2 A helium carbon monoxide B helium hydrogen C nitrogen carbon monoxide D nitrogen hydrogen 4 The graph shows the change in temperature with time when a substance at 120 °C is cooled to –20 °C. Which statement correctly describes the change taking place between the points? A The volume of vapour is decreasing from R to S. B The particles release energy as they become closer together from Q to R. C The particles absorb energy as they become more orderly from S to T. D The energy of the particles remain constant from 20 °C to -20 °C. ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA 4 5 The melting and boiling points of some gases in air are shown below. gas melting point/ °C boiling point/ °C oxygen – 219 – 183 argon – 189 – 186 nitrogen – 210 – 196 What temperature should the sample of air be decreased to in order to obtain only liquid oxygen? A – 180 °C B – 182 °C C – 185 °C D – 219 °C 6 Which of the following physical processes could be used to separate a mixture of hexane and water? A filtration B fractional distillation C sublimation D use of separating funnel 7 A student carried out a chromatography experiment. The diagram below shows the chromatogram obtained. Which one of the following gives the Rf value of the dye? A B C D ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA [Turn over 5 8 Which substance is likely to be a pure compound? A a colourless liquid which gives two fractions when distilled B a white powder that dissolves in water C a yellow liquid that boils at 115 °C D green crystals that start to melt at 72 °C and completely melt at 75 °C 9 The descriptions of three substances are given as follows: substance description X It is made up of identical molecules which burns in excess air to form carbon dioxide and water. Y It is a gas which burns in excess air to form water only. Z Its solution can be separated into three dyes by paper chromatography. Which of the following correctly classifies substances X, Y and Z? X Y Z A element element compound B compound compound mixture C compound element mixture D element mixture element 10 An element, Z, has p protons and n neutrons in the nucleus of its atoms. Element Z reacts with oxygen to form a basic oxide. Which list gives the correct information about the ion of an isotope of Z? number of protons number of neutrons number of electrons A p n + 1 p + 1 B p n + 1 p – 1 C p + 1 n p + 1 D p + 1 n p – 1 11 A hydrated salt, MSO4.nH2O is formed when 0.2 mol of MSO4 reacts with 36.0 g of water. What is the value of n? A 2 B 4 C 5 D 10 ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA 6 12 When a few drops of aqueous ammonia are added to copper(II) sulfate solution, the reaction that takes place can be represented by the following ionic equation: Cu2+(aq) + 2OH-(aq) Cu(OH)2(s) In excess aqueous ammonia, a soluble copper(II) complex ion is formed. What would be observed when 20 cm 3 of 0.5 mol/dm 3 aqueous copper(II) sulfate was mixed with 30 cm3 of 1.0 mol/dm3 aqueous ammonia? A pale blue solution B dark blue solution C blue precipitate in colourless solution D colourless solution 13 At the start of a reaction, a 2.00 dm 3 solution contains 0.500 mol of ethanol. After 100 seconds, the concentration of the ethanol has decreased to 0.140 mol/dm 3. What is the decrease in the concentration of ethanol? A 0.036 mol/dm3 B 0.140 mol/dm3 C 0.110 mol/dm3 D 0.250 mol/dm3 14 The shell of a quail egg makes up 2% of the mass of an average quail egg. An average quail egg has a mass of 15 g. Assuming the quail egg shell is made up of pure calcium carbonate, what is the volume of 1.0 mol/dm 3 hydrochloric acid that 10 quail eggs can neutralise? A 0.0250 dm3 B 0.0300 dm3 C 0.0500 dm3 D 0.0600 dm3 15 Element Y exists as 3 stable isotopes and has a relative atomic mass of 65.0. Which of the following compositions of isotopes is correct? A 32.1% 64Y, 56.4% 66Y and 11.5% 67Y B 54.6% 64Y, 6.6% 66Y and 38.8% 67Y C 56.3% 64Y, 31.1% 66Y and 12.6% 67Y D 50.3% 64Y, 25.5% 66Y and 24.2% 67Y 16 Chloroform, also known as trichloromethane, is a colourless, sweet -smelling liquid which was once used as an anaesthetic. How many valence electrons are not involved in bonding? A 0 B 2 C 18 D 21 ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA [Turn over 7 17 Which statement about one mole of a metal is always true? A It contains the same number of particles as 1/12 mole of 12C. B It has the same mass as one mole of hydrogen atoms. C It contains the same number of particles as one mole of hydrogen atoms D It contains the same mass as one mole of 12C. 18 Carbon can form different structures as shown in the diagram below. Which of these structure(s) is/are able to conduct electricity? A I and IV only B II and III only C I, II and III only D III and IV only ���

EDG/PRELIM22/CHEM/6092/01/4EXP/SHA 8 19 Two separate tests were carried out on an unknown salt solution, Z. The results of the tests are shown in the table below. test result 1 add aqueous ammonia green precipitate fo