UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *4308315385* CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may need to use a pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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A-CN-K (Al2O3- (CaO*+Na2O)-K2O) diagram A–CN–K ternary plot is useful tool to evaluate weathering trends in the source rock and to estimate K-metasomatism [Nesbitt and Young (1982‚ 1984); Fedo et al.‚ 1995]. The ideal weathering lines are parallel to A-CN boundary because the removal rates of Na and Ca from plagioclase are greater than the removal rate of K from k-feldspars. On the A–CN–K ternary plot (Fig.6.16) the samples are plotted more or less close to A - K boundary indicating that removal
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *6145201818* CHEMISTRY Paper 3 (Extended) 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 pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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NUCLEUS The positively charged dense central part of an atom. In Biology the term first introduced by Miescher‚ employed to describe a structure round in the cells of with the tissues of animals and plants are composed. In general it is a viscous spherical body containing a structure known as the plasmosome or nucleolus and a tangle of material chromatin characterized by a special affinity for basic dyes‚ usually spherical mass of protoplasm found in the most living cells that directs the activities
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CHEMISTRY (Theory) Time allowed : 3 hours General Instructions: (i) All questions are compulsory. Maximum Marks : 70 (ii) Marks for each question are indicated against it. (iii) Question numbers 1 to 8 are very short-answer questions and carry 1 mark each. (iv) Question numbers 9 to 18 are short-answer questions and carry 2 marks each. (v) Question numbers 19 to 27 are also short-answer questions and carry 3 marks each. (vi) Question numbers 28 to 30 are long-answer questions and carry 5 marks
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be developed as alternative drugs are the antimicrobial peptides. In the present study the antimicrobial peptide Microcin C7 was docked with the catalytic domain of Diphtheria toxin and further the simulational studies were performed to find the stability of the complex. The results were significant and hence it was predicted that further work can be done on antimicrobial peptide to develop it as an altenative drug against Diphtheria toxin. Keywords- I. INTRODUCTION In the last few decades drug resistant
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DOE-HDBK-1019/1-93 JANUARY 1993 DOE FUNDAMENTALS HANDBOOK NUCLEAR PHYSICS AND REACTOR THEORY Volume 1 of 2 U.S. Department of Energy Washington‚ D.C. 20585 FSC-6910 Distribution Statement A. Approved for public release; distribution is unlimited. This document has been reproduced directly from the best available copy. Available to DOE and DOE contractors from the Office of Scientific and Technical Information. P.O. Box 62‚ Oak Ridge‚ TN 37831. Available to the public from the National
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case of conjugation that leads to an especially stable bonding arrangement. The benzene ring consists of six sp2 hybridized carbon atoms in a regular hexagon. Each carbon forms two σ-bonds with adjacent carbons‚ and a third σ-bond with a hydrogen atom. The 2p orbital on each atom is available for π-bonding. Interaction between the p orbitals on the six carbon atoms forms a conjugated system of π-electrons. Molecules with this bonding arrangement are called aromatic molecules. For convenience
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1 hour IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI N07/4/PHYSI/HPM/ENG/TZ0/XX+ 88076501 Physics higher level PaPer 1 Thursday 8 November 2007 (afternoon) INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. 8807-6501 21 pages © IBO 2007 –2– 1. Which
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Describe the difference between a mixture and a compound. A compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components‚ a compound cannot. Below are some examples of the differences between each. Compounds •Compounds are pure substances. •They are made up of two or more
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