Copy of VS 2024 Sec 4 Chem Prelim Paper 1

[Turn Over Class Register Number Name 6092/01 CHEMISTRY 24/S4PRELIM/6092/1 PAPER 1 Tuesday 9 September 2024 1 hour VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, class and index number on all the work you hand in. Do not use staples, paper clips, glue or correction fluid. 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 that 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 Periodic Table is printed on page 15. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 15 printed pages, including the cover page.

2 ©Victoria School 24/S4PRELIM/6092 [Turn Over 1 A chromatogram was prepared using a mixture of substances. After drying, the chromatogram is shown in the diagram. Which statement is correct? A Locating agents are always needed to interpret a chromatogram. B There are only two substances present in the mixture. C The chromatogram is placed with start line above the solvent. D The substance at level X has a lower R f value than the substance at level Y. 2 Oxygen was prepared and collected using the apparatus as shown in the diagram below. The first tube of gas collected was discarded as it was contaminated. Which contaminant was in the gas? A hydrogen B hydrogen peroxide C manganese(IV) oxide D nitrogen solvent front start line Y X hydrogen peroxide manganese(IV) oxide water

3 ©Victoria School 24/S4PRELIM/6092 [Turn Over 3 The diagram shows a diffusion experiment. Which gas, when present in the beaker, will cause the water level at Y to rise the most? A carbon dioxide B helium C nitrogen D water vapour 4 An unknown substance X starts melting at –180 °C and finishes melting at –160 °C. What is substance X likely to be? A a compound B a mixture C an element D insufficient data to determine 5 Which of the following statements about isotopes is correct? A Isotopes are atoms of the same element with the same number of protons but different number of electrons. B Isotopes are atoms of the same element with the same number of protons but different number of neutrons C Isotopes are atoms of the same element with the same number of neutrons but different number of electrons. D Isotopes are atoms of the same element with the same number of neutrons but different number of protons. Y beaker porous pot oxygen water

4 ©Victoria School 24/S4PRELIM/6092 [Turn Over 6 The table shows the number of sub-atomic particles in four different ions. Which ion has the correct number of sub-atomic particles shown? 7 Heavy water is made up of 2 deuterium (2H) atoms and 1 oxygen atom. Which properties are true about heavy water? 1 Its boiling point is higher than 100 °C. 2 It reacts with sodium to form sodium hydroxide and hydrogen gas. 3 It can act as a solvent for sodium chloride. A 1 only B 2 and 3 only C 1, 2 and 3 D none of the above 8 The diagram below shows the structures of 3 substances. All the atoms in each structure are made up of the same element. Which of the following substance(s) can be used as an electrode? 1 2 3 A 2 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 9 The structure of hydrazine is shown below. How many pairs of unbonded electrons are there in a hydrazine molecule? A 0 B 2 C 4 D 8 ion number of sub-atomic particles protons neutrons electrons A Cl 17 20 18 B Cu + 29 35 31 C Li+ 4 4 2 D N3 7 14 10 - 64 29 7 3 37 17 - 14 7 2

5 ©Victoria School 24/S4PRELIM/6092 [Turn Over 10 Which substances contain the same number of atoms? 1 1.20 mol of NH3 2 1.445 x 1024 molecules of O2 3 36.0 g of C6H12O6 4 57.6 dm3 of Cl2 A 1 and 2 only B 1 and 3 only C 2 and 4 only D 1, 2, 3 and 4 11 Calcium nitrate crystals contain water of crystallisation. Its formula may be written as Ca(NO3)2●nH2O. When a 7.00 g sample of hydrated calcium nitrate is heated to remove all water, 4.90 g of anhydrous calcium nitrate remains after heating. What is the value of n? A 1 B 2 C 3 D 4 12 Copper is obtained from copper-bearing ores. Below are a list of copper-bearing ores and their formulae. Given 1 g of ore, which will produce the most copper? A azurite, Cu 3(CO3)2(OH)2 B chalcocite, Cu2S C chalcopyrite, CuFeS2 D malachite, Cu2CO3(OH)2 13 20 cm3 of oxygen is reacted with 50 cm3 of hydrogen. What are the volumes of gases, measured at room temperature and pressure, remaining at the end of the reaction? volume of oxygen cm3 volume of hydrogen cm3 volume of product cm3 A 0 10 0 B 0 10 40 C 5 0 50 D 10 0 40

6 ©Victoria School 24/S4PRELIM/6092 [Turn Over 14 Dilute potassium iodide solution is electrolysed using inert electrodes. What are the observations at the cathode and the anode? cathode anode A colourless gas brown solution B colourless gas colourless gas C grey solid brown solution D grey solid purple gas 15 A simple cell is set up as shown in the diagram below. Which pair of metals M and N will produce the highest voltage when used as electrodes in the simple cell? metal M metal N A copper silver B magnesium iron C magnesium silver D tin iron A metal M in a solution of a salt of M metal N in a solution of a salt of N porous membrane V

7 ©Victoria School 24/S4PRELIM/6092 [Turn Over 16 The energy level diagram of a reaction is shown below. Which arrow represents the overall enthalpy change of the reverse reaction? 17 Dissolving ammonium nitrate in water is endothermic. Which graph shows how the temperature of the solution alters as ammonium nitrate is added and then the solution is left to stand for some time? A B C D room temperature temperature/ °C room temperature temperature/ °C room temperature temperature/ °C room temperature temperature/ °C 0 0 time/s time/s time/s time/s 0 0 N2 + 2O2 2N + 4O 2NO2 energy / kJ progress of reaction A B C D

8 ©Victoria School 24/S4PRELIM/6092 [Turn Over 18 Aqueous hydrogen peroxide decomposes to form water and oxygen gas. Two experiments were carried