Serangoon Prelim P1

1 SERANGOON SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 EXPRESS CANDIDATE NAME ( ) CLASS CENTRE NUMBER S INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 Aug 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Setter(s): READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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 the Periodic Table is printed on page 20. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 18 printed pages, including this cover page. For examiner’s use 40

2 1 Magnesium sulfate is prepared by reacting excess magnesium carbonate with dilute sulfuric acid. MgCO3(s) + H2SO4(aq) → MgSO4(aq) + CO2(g) + H2O(l) Which two pieces of apparatus are needed to obtain magnesium sulfate crystals by this reaction? 1 thermometer 2 evaporating dish 3 filter funnel 4 gas syringe A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 2 An unknown substance melts at -210 oC and boils at -196 oC. Which of the following correctly describes the arrangement and movement of the particles of this substance at -204 oC? arrangement movement A closely packed in a disorderly manner sliding past one another B closely packed in a disorderly manner vibrating about fixed positions C closely packed in an orderly manner sliding past one another D closely packed in an orderly manner vibrating about fixed positions

3 3 The following diagrams can be used to illustrate 1 a mixture of elements and compounds 2 a mixture of elements 3 molecules of an element 4 molecules of a compound What is the correct order of the diagrams? 1 2 3 4 A X W Y Z B X Z W Y C Z Y W X D Z Y X W 4 A new substance was discovered, and a series of experiments were conducted on it. Which observation suggests that the substance cannot be an element? A It has a fixed boiling point. B It dissolves in water to form a yellow-green solution. C When heated strongly, a brown solid and a yellow gas are produced. D When heated in air, it can form oxides with two different chemical formulae. W X Y Z

4 5 An atom of element T has x protons and y nucleons. How many neutrons and