CHIJ 4NA Sci (Chem) Prelim 2023 P3

Index Number Class Name CHIJ ST JOSEPH’S CONVENT PRELIMINARY EXAMINATIONS NA SCIENCE (CHEMISTRY) Paper 3 Multiple Choice Secondary 4 Normal (Academic) NA 5105/03 5107/03 Thursday, 27 July 2023 Papers 3 and 4: 1 hour and 15 minutes Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Paper 3: There are twenty 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no longer than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. A copy of the Periodic Table is printed on page 8. This document consists of 8 printed pages.

2 Paper 3 (20 marks) Answer all questions. 1 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 2 The table shows the boiling points of some of the elements present in air. element boiling point / °C argon -186 helium -269 neon -246 nitrogen -196 oxygen -183 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

3 3 Which observation shows that a liquid is a pure substance? A It boils at a fixed temperature. B It cannot be broken down into any simpler substances. C It conducts electricity at room temperature. D It is colourless. 4 A sample of a white crystalline substance is heated in the absence of oxygen. It melts sharply at 120 °C, but on further heating gives off smoky fumes and a black solid remains. From this information, we can conclude that the white crystalline substance is A a compound which combusted to form two products. B a compound which decomposed to form simpler substances. C a mixture of substances which combined chemically. D an element which decomposed to form simpler substances. 5 A sodium atom is represented as 𝑁𝑎11 23 . How many electrons does one atom of sodium contain? A 11 B 12 C 23 D 34 6 Which row represents an ion? number of protons number of neutrons number of electrons A 1 0 1 B 3 4 3 C 6 6 6 D 11 12 10

4 7 The isotopes of chlorine, 𝐶𝑙35 and 𝐶𝑙37 both form ions with a single negative charge. Which of the following statements about these ions are true? A Both ions have an electronic configuration of 2.8.7. B 𝐶𝑙37 has a greater number of protons and electrons compared to 𝐶𝑙35 C The ions have the same number of electrons but different number of neutrons. D The ions have the same number of neutrons but different number of protons. 8 In the diagram below, each sphere represents a particle about the size of an atom and the sign indicates the charge on the particle. In which of the following substances would the above model be a reasonable representation of how the particles are arranged in the structure? A barium chloride B carbon monoxide C lithium bromide D zinc metal 9 A newly discovered element, Xylonium (Xy), is placed in Group II of the Periodic Table. Which is the correct chemical formula for its sulfate? A XySO4 B Xy(SO4)2 C Xy2SO4 D Xy2(SO4)2 10 Which is the correct description of the oxide of the element? element type of oxide A copper amphoteric B magnesium basic C sodium acidic D sulfur basic

5 11 What is used to decide the order of the elements in the Periodic Table? A density B number of neutrons C number of protons D relative atomic mass 12 Astatine is an element in Group VII of the Periodic Table. Which of the following describes the properties of astatine at room temperature and pressure? state colour of substance A gas pale B liquid dark C solid pale D solid dark 13 The table below gives information about the reactivity of three metals, X, Y and Z. metal reaction with steam reaction with dilute hydrochloric acid X forms an oxide forms hydrogen Y no reaction no reaction Z no reaction forms hydrogen What is the order of reactivity of X, Y and Z? most reactive least reactive A X Y Z B X Z Y C Y Z X D Z X Y 14 Which diagram correctly represents an alloy? A B C D

6 15 Which statement(s) is/are true for all metals? 1 conducts electricity 2 reacts with hydrochloric acid 3 high melting point 4 high density A 1 only B 1 and 3 only C 1, 3 and 4 only D 2 only 16 Air is a mixture of gases. In air, which gas is present in the greatest amount? A carbon dioxide B hydrogen C nitrogen D oxygen 17 The diagram shows a fractionating column used in the separation of petroleum. Which row explains why fraction R is collected above fraction S? boiling point of R average molecular mass of R A greater than S greater than S B greater than S smaller than S C lower than S greater than S D lower than S smaller than S

7 18 The diagrams below show the structures of three compounds. P Q R Which of these compounds belong to the same homologous series? A P and Q B P and R C Q and R D P, Q and R 19 Pentadecane, C 15H32, undergoes a process, forming substance Z and other products. C15H32 → C10H20 + Z + H2 What is the name of this process and what is substance Z? name of process substance Z A cracking C5H10 B cracking C5H12 C fractional distillation C5H10 D thermal decomposition C5H10 20 A student investigated the reaction of vegetable oils with hydrogen. 100 cm 3 of hydrogen was bubbled through 1 g samples of four different vegetable oils. The volume of hydrogen remaining after each experiment was recorded. vegetable oil volume of hydrogen remaining / cm3 P 100 Q 87 R 63 S 0 Which vegetable oil(s) is/are unsaturated? A P only B Q and R only C Q, R and S only D S only

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