Copy of CHS 2024_S4_OP_Prelim Paper 1

[Turn Over Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 ‘O’ Level Programme CHEMISTRY 6092/01 Paper 1 27 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, pencil clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces provided. There are forty questions in 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. 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 given on page 16. The use of an approved scientific calculator is expected, where appropriate. For examiner’s use only: Total / 40 This document consists of 16 printed pages.

2 1 When calcium carbonate is added to dilute hydrochloric acid, carbon dioxide gas is released. Three sets of apparatus are shown. 1 2 3 Which sets of apparatus are suitable, together with a stopwatch, for following the rate of this reaction? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 2 Solutions of Ca(NO3)2 and Cu(NO3)2 separately undergo a series of reactions. Ca(NO3)2(aq) J K L Cu(NO3)2(aq) M N O J, K and L are calcium compounds. M, N and O are copper(II) compounds. How many of J, K, L, M, N and O contain precipitates? A 2 B 3 C 4 D 5 Na2CO3(aq) Na2CO3(aq) excess HCl(aq) excess HCl(aq) excess NH3(aq) excess NH3(aq)

3 [Turn Over 3 An excess of sodium hydroxide solution is added to a solution of salt P and warmed. A gas that turns damp red litmus paper blue is only given off after aluminium foil is added to the hot solution. What is salt P? A ammonium chloride B ammonium nitrate C sodium chloride D sodium nitrate 4 The diagram shows the apparatus used to separate hexane (boiling point, 70 oC) and heptane (boiling point, 98 oC). Which graph would be obtained if the temperature at point Q was plotted against the total volume of distillate collected? A B C D Q distillate water in water out thermometer heat temperature / oC total volume of distillate / cm3 70 80 90 100 temperature / oC total volume of distillate / cm3 70 80 90 100 temperature / oC total volume of distillate / cm3 70 80 90 100 temperature / oC total volume of distillate / cm3 70 80 90 100

4 5 Four experiments, each containing a different acidic gas, are set up as shown. The dividing glass plates are removed at the same time. In which set of apparatus does the litmus paper turn