2022 Cedar girls secondary school Prelim Chemistry Paper 1

CEDAR GIRLS’ SECONDARY SCHOOL Preliminary Examination 2022 Secondary Four [Turn over CHEMISTRY 6092/01 Paper 1 15 September 2022 1 hour Additional Materials: OMR Form INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your name, class and index number on the answer sheet in the spaces provided unless this has already been done for you. 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. Read very carefully the instructions on the answer sheet. INFORMATION FOR CANDIDATES 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 provided on page 19. The use of an approved scientific calculator is expected, where appropriate. This document consists of 19 printed pages and 1 blank page.

2 1 At room temperature and pressure, which gas diffuses faster than nitrogen gas? A argon B fluorine C methane D oxygen 2 The diagram shows the fractional distillation of two liquids, R and S. R has a boiling point of 80 oC and S has a boiling point of 110 oC. Which statement is correct when the thermometer shows 80 oC? 1 The liquid left in the flask contains more S than R. 2 The vapour at point Y only contains R. 3 The temperature at X is higher than the temperature at Y. A 1, 2 and 3 B 1 and 2 only C 1 only D 2 and 3 only thermometer

[Turn over 3 3 The diagram shows the chromatogram obtained by the analysis of a dye mixture. The distances travelled by three spots are shown in the diagram. What is the Rf of the most soluble dye? A 0.20 B 0.80 C 1.00 D 1.25 4 The equation shows the reaction between calcium hydroxide and dilute nitric acid. Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O An experiment is conducted to determine the solubility of calcium hydroxide in water at room temperature. 25.0 cm3 of a saturated solution of freshly prepared calcium hydroxide is titrated against dilute nitric acid. Besides the conical flask, what other apparatus is needed for the titration? A beaker and pipette B burette and measuring cylinder C burette and pipette D burette and stirrer 10 cm 8 cm 6 cm 2 cm solvent front start line

4 5 The apparatus below is used to obtain a small sample of dry nitrogen gas from a sample of ga