CIE Jun 2017 v2 Paper 2 Q1 (with explained solutions) |

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CIE Jun 2017 v2 Paper 2 Q1

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Answer all the questions in the spaces provided. PMT The composition of atoms and ions can be determined from knowledge of atomic number, nucleon number and charge. (a) Complete the table. atomic number nucleon number number of electrons number of protons number of neutrons 23 26 32 symbol 6Li+ 3 [2] (b) Boron occurs naturally as a mixture of two stable isotopes, 10B and 11B. The relative isotopic masses and percentage abundances are shown. isotope relative isotopic mass abundance / % 10B 11B 10.0129 to be calculated 19.78 80.22 (i) Define the term relative isotopic mass.[2] (ii) Calculate the relative isotopic mass of 11B. Give your answer to six significant figures. Show your working. [2] [Total: 6]UCLES 2017 9701/22/M/J/17<br />

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9701/22 Question 1(a) 1(b)(i) 1(b)(ii) (10.0129 19.78) 100 (80.22x) 10.8 x = 10.9941UCLES 2017 Page 2 of 9 Cambridge International AS/A LevelMark Scheme PUBLISHED Answer May/June 2017 Marks atomic number nucleon number number of electrons number of protons number of neutrons symbol 26Fe + 58 EITHER mass of an atom / isotope relative / compared to 1/12 (the mass) of (an atom of) C-12 OR on a scale in which a C-12 (atom / isotope) has (a mass of exactly) 12 (units) OR mass of one mol (of atoms) of an isotope relative / compared to 1/12 (the mass) of 1 mol of C-12 OR on a scale in which one mol C-12 (atom / isotope) has a mass of (exactly) 12 g 1 1 1 1 Total:<br />

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