Exam (elaborations)
EDEXCEL CHEMISTRY 2021 A level paper 3 qp
EDEXCEL CHEMISTRY 2021 A level paper 3 qp S - The Marketplace to Buy and Sell your Study Material *P67806A0136* P67806A ©2021 Pearson Education Ltd. 1/1/1/1/1/1 Turn over 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. Information • The total mark for this paper is 120. • 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. • Show all your working in calculations and include units where appropriate. • Check your answers if you have time at the end. • Good luck with your examination. Pearson Edexcel Level 3 GCE Candidate surname Other names Candidates must have: Scientific calculator Data Booklet Ruler Total Marks Centre Number Candidate Number Please check the examination details below before entering your candidate information Time2 hours 30 minutes Paper reference 9CH0/03 Chemistry Advanced PAPER 3: General and Practical Principles in Chemistry 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 *P67806A0236* 2 Answer ALL the questions. Write your answers in the spaces provided. 1 This question is about chlorine. (a) Chlorine has two isotopes with mass numbers 35 and 37. (i) Complete the table to show the numbers of subatomic particles in a 35Cl atom and a 37Cl − ion. (2) Particle Protons Neutrons Electrons 35Cl atom 37Cl − ion (ii) A sample of chlorine contained 75 % of 35Cl and 25% of 37Cl. Complete the mass spectrum to show the peaks you would expect for the molecular ion Cl2 + from this sample of chlorine gas. (2) 100 90 80 70 60 50 40 30 20 10 0 69 70 71 72 73 74 75 Relative abundance m / z 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 *P67806A0336* Turn over 3 (b) Write the formula of potassium chlorate(V). (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(c) Write the equation for the first electron affinity of chlorine. Include state symbols. (2) (d) The standard electrode potential for the chlorine /chloride ion half-cell is ½Cl2(aq) + e −⇌Cl − (aq) E O cell= +1.36 V (i) Identify an oxidising agent from the Data Booklet that will convert chloride ions into chlorine under standard conditions. (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(ii) Calculate the value of E O cellfor the reaction in (d)(i).
