WDL 4NA Science Chemistry P3 Question Booklet 2023

1 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) Name: ........................................................................ ( ) Class: ................ WOODLANDS SECONDARY SCHOOL PRELIMINARY EXAMINATIONS 2023 Level: Secondary Four Normal (Academic) Marks: 20 Subject: Science (Chemistry) Day: Wednesday Paper: 5105/03 and 5107/03 Date: 2 August 2023 Duration: 1 hour 15 minutes (Papers 3 and 4) Time: 1145 – 1300 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 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 completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 12. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. This document consists of 11 printed pages and 1 blank page.

2 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 1 Two methods of collecting gas X are shown. X What can you infer about the properties of X? solubility of X in water density of X A high higher than air B high lower than air C low higher than air D low lower than air 2 The diagram shows a paper chromatogram. Which brand of drink is made by mixing dyes X and Y? A M B N C P D Q water X M N P Q X Y dye brand of drink

3 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 3 Which diagram represents a mixture of hydrogen chloride gas, hydrogen gas and chlorine gas? A B C D 4 A gaseous substance was allowed to cool. The graph of its temperature against time is shown. Which letter denotes the boiling point of the substance?

4 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 5 The table gives information about four atoms E, F, G and H. atom number of protons number of neutrons E 10 10 F 10 12 G 12 12 H 14 10 Which two atoms are isotopes of each other? A E and F B E and H C F and G D G and H 6 Which of the following particles does not have the same number of electrons as a neon atom? A Mg24 12 B -314 7 N C +Na23 11 D -216 8 O

5 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 7 The diagram below shows the electron arrangement in compound KL3. Which elements could be K and L? K L A sodium sulfur B aluminium nitrogen C phosphorus fluorine D sulfur nitrogen 8 The electronic structures of atoms S and T are shown below. Which row describes the physical properties of the compound formed between S and T correctly? melting point / C electrical conductivity solid state aqueous state A -113 no no B 180 no yes C 801 no yes D 1132 yes yes K L L L S T

6 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 9 How many moles of argon are there in 20 g of argon? [relative atomic mass of Ar: 40] A 0.5 mol B 2 mol C 20 mol D 800 mol 10 The formula of a chloride of strontium is SrCl2. What is the formula of the strontium oxide? A SrO B SrO2 C Sr2O D Sr2O3 11 When compound U is added to zinc strip, hydrogen gas is produced. When compound V is added to sodium carbonate, a gas that forms a white precipitate with limewater is produced. What are U and V? U V A acid acid B acid alkali C alkali acid D alkali alkali

7 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 12 The table below shows the colours of methyl orange and phenolphthalein at different pH ranges. methyl orange phenolpthalein pH range 1 to 4 4.1 to 14 pH range 1 to 10 10.1 to 14 colour red yellow colour colourless pink What would be the colour of each indicator in pure water? methyl orange phenolpthalein A red colourless B red pink C yellow colourless D yellow pink 13 The diagrams below show how a colourless solution of Z is produced from the reaction between dilute sulfuric acid and a solid Y. What are Y and Z? Y Z A barium nitrate barium sulfate B calcium chloride calcium sulfate C copper copper(II) sulfate D magnesium carbonate magnesium sulfate

8 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 14 In three experiments, chlorine gas was bubbled into different solutions. In which experiment(s) will a displacement reaction not occur? A 1 only B 3 only C 1 and 2 D 2 and 3 15 Which of the following statements represents a trend as we move from the left to th e right across a period? A The aqueous solutions of their oxides have increasing pH values. B The metallic properties decrease. C There is a decrease in the number of filled electron shells. D There is a decrease in the number of valence electrons. 16 Metals are often recycled. What is/are the advantage(s) of recycling metals? 1 conserve finite metal resources on the Earth’s surface 2 more energy consumption 3 reduces environment problems A 1 only B 1 and 2 only C 1 and 3 only D All of the above

9 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 17 The table gives information about three different metals. metal method of extraction reacts with cold water P reduction by carbon monoxide × Q reduction by carbon monoxide  R electrolysis  What is the correct order of reactivity of these metals? most reactive least reactive A P Q R B Q P R C Q R P D R Q P 18 Some processes that produce pollutants are shown below: I combustion of nitrogen at high temperature in car engines II incomplete combustion of fossil fuels III lightning activity IV volcanic eruptions Which of these processes may produce nitrogen dioxide? A I and IV only B I and III only C II only D II and III only

10 5105 and 5107/03/Prelim/2023 NORMAL (ACADEMIC) NORMAL (ACADEMIC) NORMAL (ACADEMIC) 19 The diagram shows the refining of crude oil. Which of the following is a use for W? A fuel for aircraft B fuel for buses and lorries C fuel for cars D surfacing roads 20 Which hydrocarbon is unsaturated? X water brand of drink M N P Q X Y dye K