2023 GDLSS Chem Prelims P1

Greendale Secondary School 1 Sec 4 Express Preliminary Examination 2023 Chemistry Name: ( ) Class/TG: GREENDALE SECONDARY SCHOOL Preliminary Examination 2023 CHEMISTRY 6092/01 Paper 1 Multiple Choice Secondary 4 Express 25 August 2023 1 hour 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 register number on the Answer Sheet and on the Question Paper 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 on this question paper. 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 18 printed pages. [Turn over

Greendale Secondary School 2 Sec 4 Express Preliminary Examination 2023 Chemistry 1 In a volumetric experiment involving the addition of hydrochloric acid to 25.0 cm 3 of aqueous sodium hydroxide it is necessary to determine when the reaction is just complete. Which piece of apparatus could be used to determine the end-point of the reaction? A balance B gas syringe C stopwatch D thermometer 2 X, Y and Z are all mixtures of alcohols. A paper chromatogram is obtained for the samples of X, Y and Z. Which row is correct? statement 1 statement 2 A Z contains at least four alcohols. X, Y and Z could contain the same alcohol. B Z contains at least four alcohols. X, Y and Z could not contain the same alcohol. C Z contains no more than four alcohols. X, Y and Z could contain the same alcohol. D Z contains no more than four alcohols. X, Y and Z could not contain the same alcohol.

Greendale Secondary School 3 Sec 4 Express Preliminary Examination 2023 Chemistry 3 A crystalline product contains a mixture of two salts. A student tests the mixture to determine which ions are present. The results are shown. test number test observations 1 add dilute nitric acid, then effervescence as a gas is produced which gives a white precipitate with limewater add aqueous silver nitrate no precipitate is formed 2 add aqueous sodium hydroxide and warm, then dissolves and a gas is produced turning moist red litmus paper blue add aluminium foil effervescence as a gas is produced which turns moist red litmus paper blue Which is present in the mixture? A ammonium carbonate and sodium chloride B ammonium carbo