GESS 4Exp Pure Chem Prelim 2024_P1

This document consists of 18 printed pages. GAN ENG SENG SCHOOL Preliminary Examination 2024 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: OTAS 6092/01 9 September 2024 1 hour 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 OTAS. Shade your index number on the OTAS. 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 OTAS 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 18. The use of an approved scientific calculator is expected, where appropriate. Total Marks 40

GESS 4EXP Chemistry 6092/01 PRELIM 2024_JAN 2 1 P, Q, R and S are pieces of apparatus. P Q R S 50 cm3 burette 100 cm3 gas syringe 50 cm3 measuring cylinder 25 cm3 pipette Which row describes the correct apparatus for the measurement made? apparatus measurement made A P the volume of acid added to alkali in a titration B Q 0.24 dm3 of hydrogen gas produced when magnesium reacts with an acid C R 75 cm3 of a gas given off in a rate-determining experiment D S 20 cm3 of alkali for use in a titration 2 X is a mixture of colourless compounds. The diagram shows a chromatogram of X and of three pure compounds, P, Q and R. Which statement is not correct? A X could contain P and R. B Q has a greater Rf value than R. C P and R have different solubilities in the solvent. D A locating agent was used to develop the chromatogram of X.

GESS 4EXP Chemistry 6092/01 PRELIM 2024_JAN 3 3 Which substance can be distilled using the apparatus below? melting point/ oC boiling point/ oC A –138 0 B –123 50 C 0 108 D 41 182 4 Which row about a change of state is correct? change of state energy change process A solid → liquid heat given out melting B gas → liquid heat taken in evaporation C solid → gas heat taken in sublimation D liquid → solid heat given out condensing

GESS 4EXP Chemistry 6092/01 PRELIM 2024_JAN 4 5 The cooling curve for substance X is shown below. At which temperature does both solid and liquid exist? A 0 ºC B 50 ºC C 150 ºC D 200 ºC 6 The ion of an element Z is shown below. In which group and period does element Z belong to in the Periodic Table? group period A 13 2 B 13 3 C 15 2 D 15 3 7 Which row includes an element, a compound and a mixture? A sea water, tap water, pure water B sodium chloride, chlorine, pure water C sea water, sodium chloride, chlorine D sodium chloride, sea water, pure water

GESS 4EXP Chemistry 6092/01 PRELIM 2024_JAN 5 8 Which row correctly classifies