2021 SASS 4E Chem MYE P2

Mid-Year Examination 2021/4 Express/Chemistry/Paper 2 1 SCI7015GD © SAS 2021 icon Candidate Name ________________________________________ CHEMISTRY 6092/2 Paper 2 Thursday 29 April 2021 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Do not open this question paper until you are told to do so. Write your name, class and index number in the spaces provided on this question paper. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer all three questions, the last question is in the form either/or. Answer all questions in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 20. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 20 printed pages. Class Index Number [Turn over ST ANDREW’S SECONDARY SCHOOL MID–YEAR EXAMINATION 2021 SECONDARY 4 EXPRESS ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL ST ANDREW’S SCHOOL 80 FOR EXAMINER'S USE

Mid-Year Examination 2021/4 Express/Chemistry/Paper 2 3 [Turn Over Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 The positions of the elements in the Periodic Table often reflect their properties. Fig 1.1 shows the positions of some elements. Fig 1.1 Answer the following questions about elements A, B, C, D, E, F, G and H. Each element may be used once, more than once or not at all. (a) Identify the element that (i) forms an aqueous hydroxide and an insoluble sulfate, ...................... [1] (ii) has the largest atomic radius and a valency of 1, ...................... [1] (iii) has the lowest boiling point, ...................... [1] (iv) represents the strongest reducing agent. ...................... [1] (b) Equal amounts of two elements were reacted with excess dilute nitric acid in separate test tubes at 25 oC. Observations made from each test tube are shown in Fig 1.2. test tube 1 test tube 2 Fig 1.2 Label Fig 1.2 with the element that has reacted in each test tube. [2] 3 The properties of elements and their compounds show similarities, differences and trends depending on the positions of the elements in the Periodic Table. (a) The positions of some elements are indicated. The letters used are not the symbols of the elements. ( D )* A % & + From the elements labelled, give the letter for; ..................... [1](i) the element that forms an amphoteric oxide, (ii) the element with the highest first ionisation energy, ..................... [1] (iii) the element that forms a soluble hydroxide and an insoluble sulfate, ..................... [1] (iv) the most volatile element in a group that contains elements in all three states of matter at room temperature and pressure, ..................... [1] (v) the element that forms the largest cation. ..................... [1] (b) The elements in Group 2 all react with oxygen and with water. (i) State and explain the conditions needed for magnesium to react with oxygen. ............................................................................................................................................. ....................................................................................................................................... [2] (ii) State what would be seen during the reaction in (b)(i). ............................................................................................................................................. ....................................................................................................................................... [1] (iii) :rite an equation for the reaction of magnesium with cold water. Include state symbols. ....................................................................................................................................... [2] 5: Chemical trends - Topic questions UCLES © 2018 4 A F 10 © UCLES 2020 0620/12/F/M/20 24 Manganese, nickel and silver are all metals. Samples of powdered manganese, nickel and silver were placed in separate test-tubes containing dilute hydrochloric acid. The results are shown. hydrogen hydrogen manganesenickel silver What is the order of reactivity of the metals, most reactive to least reactive? A m a n g a n e s e → nickel → silver B m a n g a n e s e → silver → nickel C s i l v e r → manganese → nickel D s i l v e r → nickel → manganese 25 Which statement about aluminium is correct? A A l u m i n i u m i s e a s y t o e x t r a c t f r o m i t s o r e b e c a u se it is near the bottom of the reactivity series. B A l u m i n i u m i s f o r m e d w h e n a l u m i n i u m o x i d e i s h e a t e d w i t h c a r b o n . C B a u x i t e i s a n i m p o r t a n t o r e o f a l u m i n i u m . D H e m a t i t e i s a n i m p o r t a n t o r e o f a l u m i n i u m . 26 S o m e p r o p e r t i e s o f a l u m i n i u m a r e l i s t e d . 1 It conducts heat. 2 It has a low density. 3 It is strong. 4 It is resistant to corrosion. Which of these properties make aluminium suitable for making food containers for chilled food products? A 1 , 2 a n d 4 B 1 , 3 a n d 4 C 1 o n l y D 4 o n l y gas bubbles gas bubbles ............. .............

Mid-Year Examination 2021/4 Express/Chemistry/Paper 2 4 A2 Sulfur is a non–metallic element. (a) Sulfur forms numerous allotropes, of which two are illustrated in Fig 2.1. hexasulfur octasulfur Fig 2.1 (i) What is the meaning of the term allotropes? .......................................................................................................................... ..................................................................................................................... [1] (ii) Predict, and explain, the allotrope that has a higher melting point. .......................................................................................................................... ..................................................................................................................... [2] (b) The relative atomic mass of a sample of sulfur can be calculated using results from the mass analysis of its isotopes. Fig 2.2 shows the results from the analysis of a sample of sulfur, with percentage composition of each isotope labelled. Fig 2.2 S S S S SS S S S S S S S S 2 9701/21/M/J/15© UCLES 2015 Answer all the questions in the spaces provided. 1