Pearson Edexcel Level 3 GCE Chemistry Advanced PAPER 3: General and Practical Principles in Chemistry. question booklet mark scheme results

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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 th... e 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 Cl+2 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*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) Ecell O = +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 Ecell O for the reaction in (d)(i). (1) (Total for Question 1 = 9 marks) [Show More]

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