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CIE Jun 2016 v1 Paper 2 Q1
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![Answer all the questions in the spaces provided. PMT (a) Complete the table to show the composition and identity of some atoms and ions. name of element nucleon number atomic number number of protons number of neutrons number of electrons overall chargelithium oxygen54 2618 10 2426 17 +1[4] (b) Beams of protons, neutrons and electrons behave differently in an electric field due to their differing properties. The diagram shows the path of a beam of electrons in an electric field. Add and label lines to represent the paths of beams of protons and neutrons in the same field. electron beam [3]UCLES 2016 9701/21/M/J/16<br />
(c) The fifth to eighth ionisation energies of three elements in the third period of the Periodic Table are given. The symbols used for reference are not the actual symbols of the elements. PMT fifth 6274 7012 6542 X Y Z ionisation energies, kJ mol1 sixth 21 269 8496 9362 seventh 25 398 27 107 11 018 eighth 29 855 31 671 33 606 (i) State and explain the group number of element Y. group numberexplanation[1] (ii) State and explain the general trend in first ionisation energies across the third period.[2] (iii) Explain why the first ionisation energy of element Y is less than that of element X.[2] (iv) Complete the electronic configuration of element Z. 1s2[1]UCLES 2016 9701/21/M/J/16 [Turn over<br />
PMT (d) A sample of strontium exists as a mixture of four isotopes. Information about three of these isotopes is given in the table. mass number abundance 86 87 88 9.86% 7.00% 82.58% (i) Calculate the abundance of the fourth isotope. (ii) The relative atomic mass of this sample of strontium is 87.71. Calculate the mass number of the fourth isotope. abundance =% [1] mass number =[2] [Total: 16]UCLES 2016 9701/21/M/J/16<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v1_QP_-_Paper_2_CIE_Chemistry_A-level_1-0.jpg)
![Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMay/June 2016 9701 21 Mark Scheme Mark Total PMT Question (a) name of nucleon atomic no. of no. of no. of overall element no. no. protons neutrons electrons charge lithium oxygen 17 +1 10 2 iron 54 26 26 28 24 +2 chlorine 35 17 17 18 17 [1] [1] [1] [1] [1] [1] [1] [4] [3] [1] [1] [1] [1] [1] [1] [2] [2] [1] [1] [1] [1] (b) line straight on labelled neutrons line (curving) up labelled protons proton line clearly shows less (overall) deflection than electron curve (c) (i) Group 16 / 6 / VI AND Big (owtte) increase / big difference / big gap / big jump / jump in increase / jump in difference after 6th IE (ii) increases (across period) due to increasing attraction (of nucleus for electrons) due to increasing nuclear charge / atomic / proton number AND constant/similar shielding / same (outer / number of) shell / energy level (iii) electron (pair) repulsion (Y has a) pair of electrons in a (3)p orbital / a (3)p orbital is full ORA (iv) (1s )2s 2p 3s 3p (d) (i) 0.56(%)Cambridge International Examinations 2016<br />
Page 3 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMay/June 2016 9701 21 Mark Scheme Mark Total PMT Question (ii) +++ 0.56) (86 9.86) (87 7.00) (88 82.58) 87.71 100 A = 84 (a) D = Ga G = Se (b) (i) D2O3 + 6HCl2DCl 3 + 3H2O M1 = species; M2 = balancing (ii) D2O3 + 2NaOH + 7H2O2NaD(OH)4(H2O)2 OR D2O3 + 2NaOH + 3H2O2NaD(OH)4 OR D2O3 + 2NaOH2NaDO2 + H2O OR D2O3 + 2OH + 7H2O2[D(OH)4(H2O)2] OR D2O3 + 2OH + 3H2O2[D(OH)4] OR D2O3 + 2OH2DO2 + H2O M1 = species; M2 = balancing (c) giant ionic / ionic lattice (d) GO2 + H2OH2GO3Cambridge International Examinations 2016 [1] [1] [2] [16] [1] [1] [1] [1] [2] [2] [1] [1] [1] [1] [1] [1] [7]<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v1_MS_-_Paper_2_CIE_Chemistry_A-level_1-0.jpg)
