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CIE Mar 2016 v2 Paper 2 Q1
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![PMT Answer all the questions in the spaces provided. This question is about Period 3 elements and their compounds. (a) Give an explanation for each of the following statements. (i) The atomic radius decreases across Period 3 (Na to Ar).[2] (ii) The first ionisation energy of sulfur is lower than that of phosphorus.[2] (iii) Sodium is a better electrical conductor than phosphorus.[2] (iv) Magnesium is a better electrical conductor than sodium.[1]UCLES 2016 9701/22/F/M/16<br />
PMT (b) The flow chart below shows a series of reactions. HNO3(aq) Mg(s) A(aq) B(g) reagent X(aq) heat white precipitate, E(s) MgO(s) + H2O(g) + C(g) D(g) (i) Give the formula of each of the compounds A to D. ABCD[4] (ii) E reacts with dilute aqueous acid to produce a gas that turns limewater cloudy. Suggest the identity of reagent X.[1] [Total: 12]UCLES 2016 9701/22/F/M/16 [Turn over<br />](https://learnah.org/wp-content/uploads/2018/08/March_2016_v2_QP_-_Paper_2_CIE_Chemistry_A-level_1-0.jpg)
![Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMarch 2016 9701 22 PMT Answer Mark Total Question (a) (i) greater attractive force OR greater force between nucleus and (outer) electrons proton number / atomic number / nuclear charge increases across period AND electrons occupy same shell / shielding roughly constant (ii) sulfurs electron removed from full (3p) orbital OR sulfur has two electrons in the same orbital electronelectron repulsion (reduces energy required) (iii) sodium has mobile / free electrons / electrons free (to move throughout the structure) phosphorus is simple / covalent / molecular (iv) magnesium has two free / delocalised / outer / valence electrons per atom OR more free / delocalised / outer electrons than sodium (b) (i) A = Mg(NO3)2 B = H2 C = NO2 OR O2 D = O2 OR NO2 [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [2] [2] [2] [1] [4] (ii) any Group I carbonate OR ammonium carbonate [1] [1] (a) (i) 27.30 10000.020 =5.4610 4(mol) (ii) (i)6 =3.2810 3(mol) [12] [1] [1] [1] [1]Cambridge International Examinations 2016<br />](https://learnah.org/wp-content/uploads/2018/08/March_2016_v2_MS_-_Paper_2_CIE_Chemistry_A-level_1.jpg)