2023 ANDSS Chem Prelims P1

This document consists of 18 printed pages. Setter: Mr Eugene Chan O ANDERSON SECONDARY SCHOOL Preliminary Examination 2023 Secondary Four Express CANDIDATE NAME: CLASS: / INDEX NUMBER: CHEMISTRY Paper 1 6092/01 22 August 2023 1 hour 0800 – 0900 h Additional Materials : Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Question Paper and Answer Sheet in the spaces provided. 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 Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. _______________________________________________________________________________

Prelim 4E CHEM 2023 6092/1 2 1 A student wants to investigate if dissolving 2.35 g of a salt in 25.0 cm3 of water is an endothermic process. Which pieces of apparatus are required? electronic balance measuring cylinder stopwatch thermometer A     B     C     D     2 Chromatogram 1 shows the separation of coloured inks in mixture Q, using solvent A. Chromatogram 2 shows the separation using the same piece of paper in another solvent B after it has been rotated 90° anti-clockwise. How many different types of ink are present in mixture Q? A 3 B 4 C 6 D 7 rotate 90° anti-clockwise chromatogram 1 chromatogram 2 Q Q first starting line second starting line

Prelim 4E CHEM 2023 6092/1 3 3 A solution contains barium ions and sodium ions and one type of anion. What could the anion be? A chloride only B nitrate only C sulfate only D chloride or nitrate 4 The cooling curve of an impure sample of substance Y is shown. Which row gives possible melting and boiling points of a pure sample of Y? melting point / C boiling point / C A –25 125 B –30 150 C –40 140 D –55 155 temperature / °C time / min

Prelim 4E CHEM 2023 6092/1 4 5 A reaction in gas clouds of the Universe is as shown. H2 (g) + H2 +(g) → H(g) + H3 +(g) How many protons, neutrons and electrons does an H3+ ion contain? protons neutrons electrons A 2 1 1 B 2 1 2 C 3 0 1 D 3 0 2 6 Which pair of substances conducts electricity by mobile electrons? substance 1 substance 2 A aqueous potassium chloride c