ASRJC 2024 H1Chem Prelim P1 QP

ASRJC JC2 Prelim 2024 8873/H1 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2024 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 24 / ___ CHEMISTRY 8873/01 Paper 1 Multiple Choice 17 September 2024 1 hour Additional Materials: Multiple choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Answer Sheet in the spaces provided. There are thirty 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. Multiple Choice Answer Sheet Write your name, class and NRIC / FIN number, including the reference letter. Shade the NRIC / FIN number. Exam Title: JC2 Preliminary Exam Exam Details: H1 Chemistry / Paper 1 Date: 17/09/2024

2 ASRJC JC2 Prelim 2024 8873/H1 1 Use of the Data Booklet is relevant to this question. A proton and a helium nucleus both move at the same speed perpendicular to a uniform electric field. Which row describes the behaviour of the proton and the helium nucleus? A They are deflected in opposite directions. The helium nucleus is deflected most. B They are deflected in opposite directions. The proton is deflected most. C They are deflected in the same direction. The helium nucleus is deflected most. D They are deflected in the same direction. The proton is deflected most. 2 Which of these atomic orbitals possesses the highest relative energy? A 2pz B 3px C 3py D 4s 3 The 7th, 8th, 9th and 10th ionisation energies of an element are shown. 7th ionisation energy / kJ mol−1 8th ionisation energy / kJ mol−1 9th ionisation energy / kJ mol−1 10th ionisation energy / kJ mol−1 9941 18 580 21 610 25 180 Which group does this element belong to? A 15 B 16 C 17 D 18

3 ASRJC JC2 Prelim 2024 8873/H1 [Turn Over 4 Silicon carbide, SiC, is a shiny, hard, chemically inert material with a very high melting point. It can be used to sharpen knives and make crucibles. Which type of structure does silicon carbide have? A a giant structure with covalent bonds between silicon and carbon atoms B a giant structure containing strong electrostatic forces of attraction between oppositely charged ions C a giant layered structure with covalent bonds between atoms and instantaneous dipole – induced dipole forces between layers D a simple molecular structure with covalent bonds between the atoms of silicon and carbon 5 Compared with the HCl molecule, the bond ….X..... of the HI molecule is ….Y….. Which pairs of words correctly complete the above sentence? X Y 1 energy greater 2 length longer 3 polarity lower A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only

4 ASRJC JC2 Prelim 2024 8873/H1 6 The diagram below shows the structure of part of a crystal of ice. O H H H H O H O H H O H H H O H O H O H H Which statement is correct? A All the bond angles surrounding each oxygen atom are 120°. B Four electrons from each oxygen are involved in forming hydrogen bonds. C The hydrogen bonds, shown by the dotted lines, are stronger than the O‒H covalent bonds. D The open structure of ice causes ice to be denser than water. 7 The ionic product of water, Kw, is affected by temperature. Temperature / oC Kw x 10−14 / mol2 dm−6 10 0.293 40 2.92 Which statement describes what happens as the temperature of water is increased from 10 oC to 40 oC? A pH of water decreases and [H+] = [OH−]. B pH of water decreases and [H+] is greater than [OH−]. C pH of water increases and [H+] = [OH−]. D pH of water increases and [H+] is less than [OH−].

5 ASRJC JC2 Prelim 2024 8873/H1 [Turn Over 8 25.0 cm3 of 0.100 mol dm –3 phosphoric acid, H 3PO4, is titrated against 0.100 mol dm –3 NaOH. The following pH value is recorded. Volume of NaOH added/ cm3 pH 25.00 4.70 The table below shows the pH range for colour change for some acid-base indicators. indicator range of pH for colour change bromocresol green 3.8 – 5.4 phenol red 6.8 – 8.4 phenolphthalein 8.3 – 10.0 Which indicator can be used to identify the titration end-point? A Phenolphthalein B Bromocresol green C Phenol red D There is no suitable indicator. 9 Use of the Data Booklet is relevant to this question. Using the apparatus shown, chlorine gas was passed through the tube. After a short time, some observable changes were seen during the experiment. What are the colours observed for gas A, gas B and of the water in the beaker during the experiment? Colour of gas A Colour of gas B Colour of water in the beaker A reddish-brown brown purple B reddish-brown purple brown C colourless purple colourless D brown brown orange potassium bromide potassium iodide gas A chlorine gas gas B water heat heat

6 ASRJC JC2 Prelim 2024 8873/H1 10 How do the properties for Group 1 elements and their ionic compounds change down the group? Reducing Power Ionisation Energy Strength of ionic bonding in Group 1 oxides A increases increases increases B decreases increases decreases C increases decreases increases D increases decreases decreases 11 Element X is in Period 3 of the Periodic Table. The following four statements were made about the properties of element X or its compounds. Three statements are correct descriptions. One of the statements is not correct because it does not fit with the other three. Which statement is not correct? A Element X forms a chloride XCl3, which reacts with more chlorine to give XCl5. B Element X is a solid at room temperature. C The oxide of X reacts with water to give an acidic solution. D Adding NaOH(aq) to the solution resulting from the reaction of XCl5 with water produces a white precipitate which is soluble in an excess of NaOH(aq). 12 Use of the Data Booklet is relevant to this question. Gallium is widely used to make alloys. From its position in the Periodic Table, which properties will it be expected to possess? 1 In the vapour phase, the chloride has the formula Ga2Cl6. 2 Its oxide dissolves in aqueous acid. 3 Its oxide dissolves in aqueous base. 4 It has a giant molecular structure. A 1, 2 and 3 only B 3 and 4 only C 1 and 2 only D 4 only

7 ASRJC JC2 Prelim 2024 8873/H1 [Turn Over 13 Use of the Data Booklet is relevant to this question. Which statement is correct? A 1 mol of ethane contains 6 mol of atoms. B 1 mol of deuteride, 2H–, contains 2 g of neutrons. C 148.3 g of magnesium nitrate contains 2 x 6.02 × 1023 ions. D 135.8 dm3 of neon ga