2022 FHSS Chem Prelims P1

Candidate Name: Class Index No. FUHUA SECONDARY SCHOOL 4E Secondary Four Express Preliminary Examination 2022 Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Seconda ry Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhu a Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Secondary Fuhua Seconda ry Fuhua Secondary CHEMISTRY 6092/01 Paper 1 Multiple Choice 31 August 2022 0800 – 0900 1 hour Additional Material: Optical Mark Recognition (OMR) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, index number on the OMR and this question booklet. 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 OMR. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on this paper. A copy of the Periodic Table is printed on page 14. The use of an approved scientific calculator is expected, where appropriate. Setter: Mdm Hia Soo Ching Vetters: Mr Elton Tan, Ms Choo Hui En, Ms Nur Hanis, Ms Veron Lee This question paper consists of 14 printed pages including this page. PARENT'S SIGNATURE FOR EXAMINER'S USE 40 ���

2 1 A student follows the rate of the reaction between marble chips, CaCO 3, and dilute hydrochloric acid. Which of the following set-ups can be used to measure the rate of reaction, together with a stopwatch? A 1 and 2 B 1 and 3 C 2 and 4 D 1, 2 and 4 2 A sample of a pure solid substance was heated until it turns completely gaseous. The graph below shows the heating curve obtained from the experiment. Which of the following statements is not correct? A At time interval AB, the average kinetic energy of the particles remains the same. B At time interval BC, the solid and liquid states are in equilibrium. C At time interval CD, heat is absorbed by the particles. D At time interval EF, the particles are moving rapidly in any direction. ���

3 3 The table below shows information about elements flerovium, Fl, and livermorium, Lv. Fl Lv proton number 114 116 nucleon number 289 292 Which of the following statements about the elements is correct? A A Lv2+ ion has the same number of electrons as a Fl atom. B A Fl 2+ ion has the same number of protons as an atom of Lv. C An atom of Fl has two more electrons as an atom of Lv. D An atom of Lv has one fewer neutron than an atom of Fl. 4 Bromine crystals are obtained by freezing bromine at -223C. What will the bromine crystals contain? A bromine atoms only B bromine molecules only C bromine ions and molecules D bromine atoms and molecules 5 The diagrams below show the structures of substances P, Q, R and S. Which of these structures conduct electricity because of mobile electrons? A P and R B R and S C Q and S D Q, R and S 6 Which of the following contains 1 mole of ions when in aqueous state? A 0.250 mol of CaO B 0.250 mol of (NH4)3PO4 C 0.500 mol of H2SO4 D 0.500 mol of CH3COOH ���

4 7 Citric acid is widely used as a flavouring and preservative in food. Which statement best describes the mixture formed when citric acid dissolves in ethanol? A It turns blue litmus red. B It contains covalent molecules only. C It contains both covalent molecules and ions. D It produces effervescence when added to carbonates. 8 The flowchart below shows the reaction that solution W undergoes. What are the identities of W, X, Y and Z? W X Y Z A Cu(NO3)2 NaNO3 Cu(OH)2 CuSO4 B CuSO4 Na2SO4 Cu(OH)2 CuSO4 C Fe(NO3)2 NaNO3 Fe(OH)2 FeSO4 D (NH4)2SO4 NH4OH Cu(OH)2 CuSO4 9 The flowcharts show the reagents added into separate test tubes containing aqueous magnesium nitrate and aluminium nitrate. Mg(NO3)2 P Q R Al(NO3)3 S T U P, Q and R are magnesium compounds. S, T and U are aluminium compounds. How many of the compounds formed, P – U, will give a white precipitate in aqueous solutions? A 2 B 3 C 4 D 5 aqueous sodium carbonate excess hydrochloric acid aqueous sodium hydroxide aqueous sodium carbonate excess sulfuric acid aqueous ammonia ���

5 10 Aqueous solution R is gradually added to aqueous solution S. The changes in pH are shown on the graph. What are the identities of R and S? R S A aqueous ammonia ethanoic acid B ethanoic acid sodium hydroxide C hydrochloric acid aqueous ammonia D aqueous ammonia hydrochloric acid 11 The consecutive reactions that may occur in a thunderstorm are as follows: N2 + O2 → 2NO 2NO + O2 → 2NO2 4NO2 + 2H2O + O2 → 4HNO3 How many moles of nitric acid are formed from 0.50 mol of nitrogen? A 0.50 mol B 1.00 mol C 2.00 mol D 6.00 mol 12 A washing powder contains sodium hydrogencarbonate, NaHCO3, as the active ingredient. In a titration, a solution containing 1.00 g of washing powder was found to react completely with 2.86 cm3 of 0.250 mol/dm3 of dilute hydrochloric acid. Assuming that sodium hydrogencarbonate is the only ingredient that reacts with the acid, what is the percentage by mass of sodium hydrogencarbonate in the washing powder? A 3.0 % B 6.0 % C 12.0 % D 24.0 % Volume of R added / cm 3 pH ���

6 13 Brass, made of copper and zinc, is more suitable to make musical instruments as compared to pure copper. Which statement best explains why brass is harder than pure copper? A The zinc atoms have more valence electrons than copper atoms. B The zinc atoms form strong metallic bonds with copper atoms in brass. C The zinc atoms prevent the delocalised electrons from moving freely in the lattice D The zinc atoms prevent layers of copper atoms from sliding over each other easily. 14 The table below refers to four metals and some of their compounds. metal action of heat on metal carbonate effect of hydrogen on heated oxide action of sulfuric acid on metal P decomposed reduced no reaction Q no reaction no reaction effervescence observed R decomposed no reaction effervescence observed S decomposed reduced effervescence observed What is the order of reactivity in descending order? A Q, S, R, P B Q, R, S, P C R, S, P, Q D R, Q, P, S 15 Which of the following is not a redox reaction? A 2Ag + Br2 → 2AgBr B 2CO + O2 → 2CO2 C Na2CO3 + CuCl2 → 2NaCl + CuCO3 D Fe + 2HCl → FeCl2 + H2 16 The table below shows the colour changes when a few drops of aqueous potassium iodide and acidified aqueous potassium manganate (VII) were added separately into four different solutions. solution potassium iodide potassium manganate (VII) 1 colourless to brown purple to colourless 2 colourless to brown no change 3 no change purple to colourless 4 no change no change Which of the following solutions is/are oxidising agent(s)? A 1 only B 1 and 2 C 1 and 3 D 4 only ���

7 17 The pollutants released into the air from car exhausts and some power stations include oxides of the type XO and YO2. What are X and Y? X Y A carbon nitrogen B carbon nitrogen and sulfur C carbon and nitrogen carbon and nitrogen D carbon and nitrogen carbon, nitrogen and sulfur