2023 KCPSS Chem Prelims P1

[Turn Over KUO CHUAN PRESBYTERIAN SECONDARY SCHOOL 2023 PRELIMINARY EXAMINATION Secondary 4 Express NAME CLASS REG. NO CHEMISTRY 6092 / 01 Paper 1 Multiple Choice 25 August 2023 1 hour Additional Materials: Multiple Choice Answer Sheet. Setter: Ms. Lim Zi Min 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 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 booklet. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages including the cover page.

2 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over Section A (40 marks) 1 The following shows the heating curve of ice. Which description in the table below best explains the respective section of the graph? section description A P to Q The particles are stationary and held in fixed positions B Q to R Heat energy taken in is used to overcome forces of attraction between particles. C R to S The volume of water is increasing as the particles expand and become larger. D T to U Water is boiling to form steam. 2 The apparatus shown below consists of a porous pot containing gas X which is surrounded by gas Y in a beaker. Which one of the following pairs of gases will cause an upward movement of the inert liquid at level Z? gas X gas Y A H2 O2 B CH4 H2 C C3H8 H2 D CO2 C3H8 temperature/°C time/min beaker porous pot U-tube containing an inert liquid Y X Z P Q R S T U

3 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 3 A student is given 250 cm3 of a saturated solution of sodium salt S and 500 cm3 of a saturated solution of potassium salt P in respective beakers . Both salts do not decompose on heating. Which of the following apparatus must she use in order to determine which salt is more soluble in water? 1 2 3 4 5 6 A 1, 2, 3 and 4 B 1, 4 and 6 C 1, 5 and 6 D 2, 4, 5 and 6 4 A student is provided with two drying agents, concentrated sulfuric acid and calcium oxide. Which method should he use to collect a sample of dry ammonia? [Mr: NH3, 17] A B C D calcium oxide dry ammonia moist ammonia concentrated sulfuric acid moist ammonia moist ammonia dry ammonia dry ammonia dry ammonia concentrated sulfuric acid calcium oxide calcium oxide moist ammonia

4 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 5 Propyl ethanoate and water are two liquids which are immiscible. Which method could be used to separate a mixture of propyl ethanoate and water? 1 fractional distillation 2 evaporation 3 filtration 4 use of a separating funnel A 1, 2 and 3 only B 1 and 4 only C 2 and 3 only D 4 only 6 A mixture is heated using the set-up shown. Which of the following mixtures can be separated into its components using this set-up? A ammonium chloride and iodine B copper(II) sulfate and sodium chloride C potassium iodide and copper(II) sulfate D sodium chloride and ammonium chloride filter funnel mixture evaporating dish heat

5 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 7 Some properties of substances P, Q, R and S are given in the table below. substance percentage composition by mass electrical conductivity when solid effect of heat P constant yes solid burns in air to form an oxide Q varies no liquid burns to form carbon dioxide and water R constant no solid decomposes to form two products S varies yes solid melts Which classification of the substances as an element, a mixture or a compound is correct? element mixture compound A P Q, S R B P S Q, R C R Q, S P D S Q P, R 8 Which row correctly shows the number of particles in 34S2-? protons neutrons electrons A 16 18 14 B 16 18 18 C 18 16 14 D 18 16 18 9 The element sodium has several isotopes, including 23Na and 24Na. Which of the following statements is true about the isotopes? A The densities of two metal coins consisting of 23Na and 24Na respectively are different. B The formulas of the chlorides formed between 23Na and 24Na and chlorine are different. C The isotopes 23Na and 24Na differ in their rate of reaction with water. D The rate of thermal decomposition of the carbonates of 23Na and 24Na are different. 16

6 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 10 The elements X and Y form the compound X2Y. What is the correct electronic configuration in the atoms of X and Y? atom of X electronic configuration atom of Y electronic configuration A 2, 1 2, 7 B 2, 2 2, 7 C 2, 1 2, 6 D 2, 2 2, 6 11 Which of the following compounds does not have both covalent and ionic bonding? A ammonium chloride B copper(II) carbonate C phosphorus pentachloride D sodium nitrate 12 Which of the following substances contain delocalised electrons? 1 iron 2 steel 3 diamond 4 graphite A 1, 2 and 4 only B 1 and 2 only C 2, 3 and 4 only D 3 and 4 only 13 Which gas sample contains the most molecules? A 4 g of hydrogen, H2 B 14 g of nitrogen, N2 C 24 dm3 of carbon dioxide, CO2 D 36 dm3 of hydrogen chloride, HCl 14 Oxalic acid has the formula C2H2O4.2H2O. What is the mass of oxalic acid crystals needed to prepare 100 cm 3 of 0.1 mol/dm3 oxalic acid solution? A 1.26 g B 2.52 g C 32.4 g D 126 g

7 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 15 A 15 cm3 sample of a gaseous hydrocarbon is completely burnt in oxygen. The total volume of the products is 75 cm3. Which equation correctly shows the complete combustion of this hydrocarbon? A CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g) B C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g) C C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) D 2C2H6 (g) + 7O2 (g) → 4CO2 (g) + 6H2O (g) 16 Solutions P and Q were tested with a few drops of universal indicator. Solution P turned the indicator red while solution Q turned the indicator yellow. Which of the following can be deduced from the experiment? A Solution P has a higher concentration of hydrogen ions than solution Q. B Solution P has a higher pH than solution Q. C Solution Q is a strong acid while solution P is a weak acid. D Solution Q is more concentrated than solution P. 17 An element burns in air to form a compound which does not react with both acids and alkalis. Which element could it be? A aluminium B carbon C iron D phosphorus 18 Which reagent, when heated and mixed with ammonium sulfate, liberates ammonia? A acidified potassium manganate(VII) solution B aqueous copper(II) chloride C dilute hydrochloric acid D limewater 19 Which one of the following salts is prepared differently? A ammonium nitrate B beryllium chloride C copper(II) sulfate D zinc sulfate

8 KCPSS 2023/Sec 4Exp Prelim Chem P1 [Turn Over 20 Which is the best way to prepare barium sulfate, starting from barium carbonate? A Add dilute sulfuric acid to barium carbonate and then filter. B Add excess aqueous sodium sulfate to barium carbonate and then filter. C Add excess nitric acid to barium carbonate followed by dilute sulfuric acid and filter. D Heat barium