4NA WA2 Practice Paper from WA2 2023 (Periodic Table, Reactivity Series and Metals

PEI HWA SECONDARY SCHOOL SECONDARY FOUR NORMAL (ACADEMIC) SC(CHEM) WEIGHTED ASSESSMENT 2 2023 (modified) Name : ______________________________ ( ) Class : 4D____ Date : ___ May 2023 TG : 4________ Duration : 30 min Parent’s Signature : ____________ Section A – Multiple Choice Questions (5 marks) Choose the correct answer and write A, B, C or D in the boxes provided. Question 1 2 3 4 5 Answer D A A C A 1 Some of the general physical properties of metals are shown. 1 2 3 4 Metals are hard solids. Metals have high densities. Metals have very high melting points. Metals are good conductors of electricity. Which of these properties does lithium have? A 1 and 2 only. B 3 and 4 only. C 2 only. D 4 only. 2 In which test tube will the rusting of the iron nail occur the fastest? A B C D 25 NaCl (aq) oil cotton wool water drying agent

2 3 The table gives information about the reactivity of three metals P, Q and R. What is the order of reactivity of P, Q and R? most reactive → least reactive A P R Q B P Q R C Q R P D R P Q 4 The table below shows the results obtained when different metals were placed in different salt solutions. A tick (√) means that a solid was deposited. A cross (×) means that there is no visible reaction. metal aqueous salt solution of metal barium nitrate chromium(III) nitrate tin(IV) nitrate caesium nitrate barium √ √ × chromium × √ × tin × × × caesium √ √ √ Which row correctly arranges the four metals in order of increasing reactivity? Least reactive Most reactive A caesium barium chromium tin B chromium barium tin caesium C tin chromium barium caesium D barium caesium tin chromium

3 5 The diagram shows an outline of the Periodic Table. W Y X U V Z Which of the following statements is true? A U is more reactive than X. B V is a soft metal that can be cut with a knife. C W is a very reactive metallic element. D Y is an inert gas. Section B – Short-Answer Questions (12 marks) Answer ALL the questions in the spaces provided. 6 (a) Element Q forms a fluoride with a chemical formula QF. QF has a melting point of 988 °C. (i) Suggest whether Q is a metal or a non-metal. Metal [1] (ii) Deduce the group number which Q is found in the Periodic Table and given that Q is found in Period 3, identify Q. 1, sodium [1] (ii) Q reacts with water vigourosly to form an alkali and a gas. By using Q identified in (a)(ii), name the products formed. alkali: sodium hydroxide gas: hydrogen gas [2] (iv) Describe how you can test for the gas produced in (a)(ii). Use a lighted splint and if it gets extinguished with a ‘pop’ sound, gas produced is hyd