Exam (elaborations)
EDEXCEL CHEMISTRY 2021 A LEVEL PAPER 1 QP
EDEXCEL CHEMISTRY 2021 A LEVEL PAPER 1 QP S - The Marketplace to Buy and Sell your Study Material *P65463A0128* Turn over Pearson Edexcel Level 3 GCE Candidate surname Other names Total Marks Centre Number Candidate Number Please check the examination details below before entering your candidate information Time Paper reference Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page with your name, centre number and candidate number. • Answer all questions. • Answer the questions in the spaces provided – there may be more space than you need. • Show all your working in calculations and include units where appropriate. Information • The total mark for this paper is 90. • The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. • For the question marked with an asterisk (*), marks will be awarded for your ability to structure your answer logically showing the points that you make are related or follow on from each other where appropriate. • A Periodic Table is printed on the back cover of this paper. Advice • Read each question carefully before you start to answer it. • Check your answers if you have time at the end. • Good luck with your examination. Candidates must have: Scientific calculator Data Booklet Ruler P65463A ©2021 Pearson Education Ltd. 1/1/1/1/1/ Chemistry Advanced PAPER 1: Advanced Inorganic and Physical Chemistry 1 hour 45 minutes 9CH0/01 S - The Marketplace to Buy and Sell your Study Material Downloaded by: Andrewkin | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material *P65463A0228*2 Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 This is a question about atoms, isotopes and ions. (a) Which of the following pairs of ions is isoelectronic? (1) A N 3– and Cl – B O 2– and S2– C Na+ and K+ D Na+ and Mg2+ (b) Which is a correct definition of relative isotopic mass? (1) A the weighted mean mass of an atom of an element relative to one twelfth of the mass of an atom of the isotope carbon-12 B the mass of one atom of an isotope relative to one twelfth of the mass of an atom of the isotope carbon-12 C the weighted mean mass of an atom of an element relative to 12 g of the isotope carbon-12 D the mass of one atom of an isotope relative to the mass of 12 g of the isotope carbon-12 S - The Marketplace to Buy and Sell your Study Material Downloaded by: Andrewkin | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material *P65463A0328*3 (c) The percentage composition of the two bromine isotopes in a sample is given in the table. Isotope Relative isotopic massPercentage abundance bromine-79 78.918 50.52 bromine-81 80.916 49.48 Calculate the relative atomic mass of bromine in this sample. Give your answer to two decimal places.
