2023 QSS Chem Prelims P1

This document consists of 18 printed pages. Name: ………………………………………………….. ( ) Class: Sec 4GR Queenstown Secondary School Preliminary Examination 2023 Secondary Four Express Chemistry 6092/01 30 August 2023 Time: 1200 – 1300h Wednesday Duration: 1 hour Setter: 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 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 the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate.

2 Queenstown Secondary School [Turn over 1 A student wants to show that the speed of reaction between 2.00 g of zinc carbonate and 30.00 cm3 of dilute nitric acid doubles for every 5°C rise in temperature. He measures the volume of carbon dioxide produced at regular intervals. Which of the following apparatus should the student use to carry out the experiment? A burette, electronic mass balance, thermometer, gas syringe B burette, electronic mass balance, thermometer, measuring cylinder C pipette, electronic mass balance, thermometer, gas syringe D pipette, electronic mass balance, thermometer, measuring cylinder 2 The chromatogram result below shows dyes, M and N present in an ink sample. What is the Rf value of the more soluble dye? A 𝑦 𝑤+𝑥+𝑦 B 𝑦 𝑤+𝑥+𝑦+𝑧 C 𝑥+𝑦 𝑤+𝑥+𝑦 D 𝑥+𝑦 𝑤+𝑥+𝑦+𝑧 3 Which of the following tests would be able to distinguish between carbon dioxide gas and sulfur dioxide gas? 1 Insert a lighted splinter into the test-tube. 2 Place a piece of damp blue litmus paper at the mouth of the test-tube. 3 Bubble the gas into a test-tube containing limewater. 4 Bubble the gas into a test-tube containing aqueous acidified potassium manganate(VII). A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

3 Queenstown Secondary School [Turn over 4 The flow chart below shows some reactions that blue solution W undergoes. What are the identities of W, X, Y and Z? W X Y Z A Cu(NO3)2 NaNO3 Cu(OH)2 CuSO4 B CuSO4 Na2SO4 Cu(OH)2 CuSO4 C Fe(NO3)2 NaNO3 Fe(OH)2 FeSO4 D (NH4)2SO4 NH4OH Cu(OH)2 CuSO4 5