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Chemistry · 2010 · May · Paper 2 · SL · TZ1 · Question paper

ChemistryQuestion paper2010SLMay

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This question paper is listed under Chemistry in the 2010 examination archive. Its catalogue level is SL. The catalogue session is May. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.

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2210-6111 11 pages M10/4/CHEMI/SP2/ENG/TZ1/XX+ Wednesday 12 May 2010 (afternoon) CHEMISTRY STandaRd lE vEl Pa PER 2 INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Section A: answer all of Section A in the spaces provided. • Section B: answer one question from Section B. Write your answers on answer sheets. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided. • At the end of the examination, indicate the numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet. 1 hour 15 minutes [Personal identifier removed] © International Baccalaureate Organization 2010 22106111 0111 2210-6111 – 2 – M10/4/CHEMI/SP2/ENG/TZ1/XX+ Section a Answer all the questions in the spaces provided. 1. Brass is a copper containing alloy with many uses. An analysis is carried out to determine the percentage of copper present in three identical samples of brass. The reactions involved in this analysis are shown below. Step 1: Cu( s) 2HNO (aq) 2H (aq) Cu (aq) 2NO( g) 2H O( l)3 +2 + 22++ →+ + Step 2: 4I (aq) 2Cu( aq)2 CuI( s) I( aq)2+ 2 − +→ + Step 3: I (aq) 2S O( aq)2 I( aq)S O( aq)22 3 2 46 2+→ +−− − (a) (i) Deduce the change in the oxidation numbers of copper and nitrogen in step 1. Copper: .................................................................. Nitrogen: .................................................................. [2] (ii) Identify the oxidizing agent in step 1. .................................................................. [1] (b) A student carried out this experiment three times, with three identical small brass nails, and obtained the following results. Mass of brass = 0.456 g 0.001 g± t itre 1 2 3 initial volume of 0.100 mol dm–3 S2o 3 2– ( 0.05 cm)3± 0.00 0.00 0.00 Final volume of 0.100 mol dm–3 S2o 3 2– ( 0.05 cm)3± 28.50 28.60 28.40 Volume added of 0.100 mol dm–3 S2o 3 2– ( 0.10 cm)3± 28.50 28.60 28.40 a verage volume added of 0.100 mol dm–3 S2o 3 2– ( 0.10 cm)3± 28.50 (This question
File information
Subject
Chemistry
Document type
Question paper
Year
2010
Session
May
Level
SL
Paper
2
Examination zone
TZ1
Language
Not labelled in the archive
File size
583 KB
Pages
11
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