2022 RSS Chem Prelims P1

1 This document consists of 18 printed pages. RIVERSIDE SECONDARY SCHOOL SUBJECT : CHEMISTRY PAPER : 6092/01 LEVEL/STREAM : 4 Express DURATION : 1 Hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, register number and class on the Answer Sheet in the spaces provided unless this has been done for you. 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 question paper. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. NAME: NO: CLASS: PRELIMINARY EXAMINATION 2022 ���

2 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 1 The apparatus shown can be used to find the rate of some chemical reactions. The rate of which reaction can be followed using these apparatus? A Cu + H2SO4 B NaOH + CuSO4 C Mg(HCO3)2 + HCl D NaOH + HCl 2 The melting and boiling points of four substances are shown in the table. Which substance will be condensed if passed through a water condenser at room temperature? hydrocarbon melting point/ oC boiling point/ oC A butane -135 0 B carbon dioxide -78.5 -78.5 C pentane -130 38 D propane -190 -45 3 An acid, X, was added to a solution of the nitrate of metal Y. A white precipitate was formed. What are X and Y? X Y A dilute hydrochloric acid calcium B dilute hydrochloric acid zinc C dilute sulfuric acid aluminium D dilute sulfuric acid barium ���

3 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 4 This experiment was set up to investigate the movement of gaseous substances. The water level at P moved down initially. What is substance X? A helium B methane C nitrogen D nitrogen oxide 5 A radioactive isotope of carbon has more nucleons than the non-radioactive isotope, 12C. Which row is correct for an atom of a radioactive isotope of carbon? protons neutrons electrons A 6 6 6 B 6 8 6 C 12 6 6 D 12 12 12 6 porous pots air air carbon monoxide X P Q water ���

4 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 6 Substance T has the properties described below. • conducts electricity when molten • melting point higher than 600 oC • highly soluble in water What is substance T? A ammonia B copper(II) oxide C magnesium chloride D zinc 7 When solid iodine is heated, it sublimes and changes into a purple gas. Which statement describes the process? A Attractive forces between iodine molecules are overcome. B Covalent bonds between iodine molecules are broken. C Intermolecular forces between iodine atoms are overcome. D Ionic bonds between the iodine atoms are weakened. 8 Which molecule has the largest number of electrons involved in covalent bonds? A carbon dioxide B ethene C methanol D nitrogen 9 Which substance is a metal? conduct electricity physical state of product formed on reaction with oxygen when solid when liquid A ü ü solid B ü ü gas C ✗ ü no reaction D ✗ ✗ solid ���

5 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 10 The formula for hydrated sodium carbonate is Na2CO3.xH2O. It contains 62.9% water of crystallisation by mass. Which other information is needed to determine the value of x? A atomic numbers of carbon, oxygen and sodium B atomic numbers of carbon, oxygen, sodium and hydrogen C relative atomic masses of carbon, oxygen and sodium D relative atomic masses of carbon, oxygen, sodium and hydrogen 11 A 25.0 cm3 sample of dilute sulfuric acid contains 0.05 moles of the acid. What is the concentration of hydrogen ion in the solution? A 1.0 mol/dm3 B 2.0 mol/dm3 C 4.0 mol/dm3 D 8.0 mol/dm3 12 126 g of potassium manganate(VII), KMnO4, is needed for the complete oxidation of 46 g of ethanol, C2H5OH, under acidic conditions. How many moles of ethanol can be completely oxidised by one mole of potassium manganate(VII) under these conditions? A 0.37 B 0.80 C 1.00 D 1.25 ���

6 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 13 The diagram shows the electrolysis of a concentrated aqueous solution containing both copper(II) ions and potassium ions. Which metal is deposited at the negative electrode and why? metal deposited reason A copper copper is less reactive than hydrogen B copper copper is more reactive than hydrogen C potassium potassium is less reactive than hydrogen D potassium potassium is more reactive than copper 14 The energy profile diagram for the forward reaction of a reversible reaction is shown. For the reverse reaction, which statement is correct? A It is endothermic and the activation energy is P – Q. B It is endothermic and the activation energy is P – R. C It is exothermic and the activation energy is P – Q. D It is exothermic and the activation energy is P – R. concentrated solution containing Cu2+ and K+ products reactants energy progress of reaction ���

7 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 15 0.24 g of magnesium ribbon was allowed to react at 25 oC with 20 cm3 of 1.0 mol/dm3 dilute hydrochloric acid. Which factor would not result in an increase in the initial rate of the reaction? A carrying out the reaction at 30 oC B using 40 cm3 of 1.0 mol/dm3 dilute hydrochloric acid C using a catalyst D using powdered magnesium 16 At the start of a reaction, 1.00 dm3 of a solution contains 0.300 mol of ethanol. After 100 seconds, the concentration of the ethanol decreased to 0.297 mol/dm3. What is the rate of reaction over the first 100 seconds? A 2.96 x 10-3 mol/dm3 / s B 3.00 x 10-5 mol/dm3 / s C 4.00 x 10-5 mol/dm3 / s D 8.00 x 10-5 mol/dm3 / s 17 The chart shows the variation for a specific ‘number’ related to the elements, nitrogen to magnesium. According to the trend, what is this ‘number’? A the number of electron shells B the number of protons and neutrons C the number of valence electrons D the oxidation number number N O F Ne Na Mg ���

8 Riverside Secondary School 6092/01/4E/Prelim/2022 [Turn over 18 Oxidising strength is a relative term used to denote how certain elements oxidise other elements with respect to each other. Which list represents the halogen in decreasing order of oxidising strength? decreasing oxidising strength A chlorine bromine iodine B chlorine iodine bromine C iodine bromine chlorine D iodine chlorine bromine 19 The list gives four oxides. 1 carbon dioxide 2 copper(II) oxide 3 magnesium oxide 4 zinc oxide Which pair of oxides can react with sodium hydroxide? A 1 and 2 B 1 and 4 C 2 and 4 D 3 and 4 20 Salt P is prepared by reacting aqueous metal carbonate and dilute acid. Which is salt P? A copper(II) chloride