PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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Match and Water in a Glass Science Magic Trick Fun Trick with Fire and Water This is a simple and interesting science magic trick involving fire and water. All you need is water‚ a glass‚ a plate‚ and a couple of matches. Pour water into a plate‚ light a match in the center of the dish and cover it with a glass. The water will be drawn into the glass. Match and Water Trick Materials • plate • water • 2 wooden matches • a quarter or other large coin • colored water
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Chemistry Revision F331 Isotopes - atoms with the same atomic number‚ but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect‚ but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also‚ less damaging. The half life is the time taken for half the isotope to decay Mass left = initial
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Bibliography: Heyworth‚ Rex M Dr‚ and J G R Briggs. Chemistry Insights. Singapore: Pearson Education South East Asia‚ 2007 http://www.google.com http://www.ausetute.com.au/elecysis.html http://www.nmsea.org/Curriculhttp://www.nmsea.org/Curriculum/7_12/electrolysis/electrolysis.htmum/7_12/electrolysis/electrolysis
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Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10.0 grams of Fe. 2. Give the mass number‚ #protons‚ #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50.0 g of benzene C6H6 4. A substance is found to be 38.7 % C‚ 9.7 % H and 51.6 % O by mass. Its molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g)
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References: 1. Dr. G. Maguire‚ 2009‚ Inorganic Chemistry (Chem. 210) Practical Manual‚ UKZN Durban. 2. Werner‚ A. “Über strukturisomere Salze der Rhodanwasserstoffsäure und der salpetrigen Säure” Berichte der deutschen chemischen Gesellschaft 1907‚ volume 40‚ 765-788. DOI: 10.1002/cber.190704001117
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General Chemistry I CHEM XXI Project Report Worksheet (4 pages max.) Experiment title: How Do We Identify an Unknown Substance? Guiding questions: State the question or questions that that you were trying to answer in this lab. How do you determine the two unknown types of plastic? What are the two unknown plastics? Safety considerations: Briefly describe the safety measures you had to take to perform the experiments. Before entering the lab‚ I put on my
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IGCSE COURSEWORK - CHEMISTRY Name:Alessia Rovegno Class: S3scA Teacher: Mr tinwin Date:1-3-13 Experiment number: Ch 3 Title: Which is the Best Fuel? Mark awarded: C1 Coursework checklist (Following instructions) | Needed for | Student | Teacher | Comments | Follows written‚ diagrammatic or oral instructions to perform a single practical operation –measures water vol | 2 | | | | Use familiar apparatus and materials adequately and safely – safety glasses | 4 | | | |
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level *0281936391* CHEMISTRY Paper 5 Planning‚ Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters
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References: Petrucci‚ Ralph H.‚William S. Harwood‚ and Geoffrey F. Herring (2002). 8th edition. Masterton‚ William L. Cecile N. Hurley‚ and Edward J. Neth (2011). 7th edition. Chemistry: Principles and Reactions. CENGAGE Learning. Equilibrium Constants. http://www.ausetute.com.au/equicons.html Retrieved last: April 24‚ 2012. Appendix K2K1’ = K = (9.77x1012)(37) K = [Cr2O72-] = 3.61x1014
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