St_Gabriels_2024_Prelims_4NA_Sc(Chem)_P3

St. Gabriel’s Secondary School 2024 ‘N’ Preliminary Examination Subject : Science (Chemistry) Paper No. : 5105/03 Level/Stream : Sec 4 Normal (Academic) Duration : 1 hour 15 minutes (for Papers 3 and 4) Date : 7 August 2024 Additional Material: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, register number and class clearly in the spaces above. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided. There are twenty 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. Answers to Paper 3 and Paper 4 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have complete Paper 3. Any rough working should be done in this question paper. A copy of the Periodic Table is printed on page 8. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination hand in your answers to Paper 3 and Paper 4 separately. This question paper consists of 8 printed pages including this cover page. Name: ………………………………………… ( ) Class: Sec ………………..

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 2 1 Which apparatus is not needed to purify a sample of river water? 2 The diagrams below show two methods of collecting gases. Which row gives the properties of a gas which can be collected by both methods? property 1 property 2 A insoluble in water denser than air B insoluble in water less dense than air C soluble in water denser than air D soluble in water less dense than air 3 The table shows the boiling points of some of the elements present in air. Which elements are liquid at -200 °C? A argon, helium and neon B argon, nitrogen and oxygen C helium and neon only D nitrogen and oxygen only

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 3 4 The graph shows a cooling curve of liquid Z. Which diagram correctly shows the arrangement of particles in Z at ‒5°C? A B C D 5 A student claims that liquid P is pure bromine. Which is the best method for him to test the purity of liquid P? A determine its boiling point B filter the liquid C see the colour of the liquid D test the pH of the liquid 6 85Z and 87Z are isotopes of an element Z. How is the ion formed by 85Z different from the ion formed by 87Z? A It has 2 less neutrons and 2 less electrons. B It has 2 less neutrons and same