SMSS Sec 3 pure chem paper 1 2024

1 This document consists of 9 printed pages. ST. MARGARET’S SCHOOL (SECONDARY) End-of-Year Examinations 2024 CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY Paper 1 Multiple Choice Secondary 3 Express 6092/01 26 September 2024 2 hours Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the cover page in the spaces provided. There are twenty 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 Multiple Choice Answer Sheet provided. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The total mark for the paper is 20. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 9. Paper 1 and 2:

2 SMS(S) 2024 1 A student carried out an experiment involving the reaction between calcium carbonate and dilute hydrochloric acid. Based on the experimental results obtained, a graph of volume of gas produced against time was plotted. Which apparatus were used by the student to make the necessary measurements? A burette, pipette and stopwatch B electronic balance and gas syringe C gas syringe and stopwatch D pipette and stopwatch 2 Aqueous iron(II) sulfate, a pale green solution, is distilled using the set-up shown. What is the temperature shown by the thermometer and the colour of the distillate in the conical flask? temperature / ºC colour of distillate A B C D 100 100 106 106 colourless pale green colourless pale green thermomete r distillate thermometer

3 SMS(S) 2024 3 Dry ice sublimes at −78 ºC. Which statement describes what happens to dry ice at 0 ºC? A The carbon dioxide particles become closely packed. B The carbon dioxide particles become far apart. C The carbon dioxide particles become smaller. D The carbon dioxide particles lose energy to the surroundings. 4 A balloon filled with gas X is placed inside a beaker filled with gas Y. After a few hours, the balloon shrinks in size. Which pair of gases would not cause the result shown above? gas X gas Y A ammonia nitrogen B carbon dioxide argon C nitrogen carbon dioxide D oxygen fluorine 5 In which option does each of the three particles have the same total number of electrons? A Cl−, Br−, I− B F−, Ne, Na+ C K+, Br–, Ca2+ D Li+, Na+, K+ gas X gas Y balloon

4 SMS(S) 2024 6 J, K and L are three different elements in the Periodic Table. The ‘dot and cross’ diagram (showing only the valence electrons) of the compound formed between J, K and L is shown below: I Element K could be nitrogen. II Element J belongs to Group 2 of the Periodic Table. III Element K and element L are bonded together by a covalent bond. IV Element L is a metal. Which statements about the three elements are correct? A I, II and III B I, II and IV C I, III and IV D II, III and IV 7 Which diagram below represents an incomplete reaction between two elements? A B C D 8 Element V has 14 neutrons and 13 protons while element W has 10 neutrons and 9 protons in their respective nucleus. What would be the molar mass of the compound formed between V and W? A 84 g/mol B 100 g/mol C 168 g/mol D 200 g/mol J 2+ 2‒ K L

5 SMS(S) 2024 9 The diagram shows the structure of silicon carbide. Silicon carbide is a hard solid. Which statement about silicon carbide explains this property? A A lot of energy is needed to slide the layers of atoms. B Atoms are bonded by strong covalent bonds in a giant network. C The giant covalent structure is held by strong ionic bonds. D The molecules are held by strong attractive forces. 10 Compound P is the only substance formed when two volumes of ammonia gas react with one volume of carbon dioxide gas (both volumes being measured at r.t.p.). What is the formula of P? A (NH2)2CO B (NH4)2CO3 C NH4CO2NH4 D NH2CO2NH4 11 Some statements about acids are given below. I pH is a measure of the H+ concentration in a solution. II The strength of an acid depends on its concentration. III Universal Indicator turns orange when placed in a solution of any acid. IV When acids react with metals, hydrogen ions gain electrons. Which statements about acids are correct? A I and II only B I and IV only C I, II and III D I, II and IV

6 SMS(S) 2024 12 Which equation suggests that a metal oxide, RO, behaves as an amphoteric oxide? A RO (s) + 2H+ (aq) → R2+ (aq) + H2O (l) B RO (s) + 2OH- (aq) → RO22- (aq) + H2O (l) C RO (s) + H2O (l) → R2+ (aq) + 2OH- (aq) D RO (s) + 2NH4+ (aq) → R2+ (aq) + H2O (l) + 2NH3 (g) 13 Which of the following does not show the appropriate reagents used for preparation of the named salts? salt reagents A copper(II) sulfate copper(II) carbonate + sulfuric acid B lead(II) nitrate lead(II) oxide + nitric acid C magnesium chloride magnesium nitrate + hydrochloric acid D zinc chloride zinc hydroxide + hydrochloric acid 14 The diagrams show three stages, 1, 2 and 3, used in the preparation of salt. Which row correctly shows the solubilities of both of the reactants and of the salt formed in this preparation? solubility of reactants solubility of salt formed A both soluble insoluble B both soluble soluble C one soluble, one insoluble insoluble D one soluble, one insoluble soluble

7 SMS(S) 2024 15 How can a pure sample of lead(II) sulfate be obtained from lead(II) carbonate? A Add lead(II) carbonate directly to dilute sulfuric acid, filter the mixture and wash the residue. B Add lead(II) carbonate directly to dilute sulfuric acid, filter the mixture and crystallise the filtrate. C Add lead(II) carbonate to dilute nitric acid, then add dilute sulfuric acid, filter the mixture and wash the residue. D Add lead(II) carbonate to dilute nitric acid, then add dilute sulfuric acid, filter the mixture and crystallise the filtrate. 16 An excess of barium chloride solution is added to a solution of magnesium sulfate and a white precipitate is formed. The mixture is then filtered to obtain the filtrate. Which solution would not produce a precipitate when added to the filtrate? A iron(II) sulfate B potassium nitrate C silver nitrate D sodium carbonate 17 When dichlorine heptoxide, Cl2O7 is added to water, a reaction takes place which is not a redox process. What could the product(s) of the reaction be? A Cl2 and O2 B HCl and O2 C HClO D HClO4 18 Which of the statement(s) is/are true about the elements in Group 1 of the Periodic Table? I They are reducing agents. II The ionic radius increases down the group. III The melting point decreases down the group. A I only B I and II only C II and III only D I, II and III

8 SMS(S) 2024 19 W, X and Y are elements in the same period of the Periodic Table. • X forms compounds of formulae XO and X2O3. • Y forms a solution of pH 14 when it reacts with water • The reaction of W with water is less vigorous than the reaction of Y with water. In which order, from left to right in the period, are the elements in the Periodic Table? A W → Y → X B X → W → Y C X → Y → W D Y → W → X 20 Nickel is between iron and lead in the reactiv