NAME-FOSU-MENSAH EMMANUEL ID NUMBER-10372921 VITAMINS Vitamins are organic compounds which are needed in small quantities to sustain life. We get vitamins from food‚ because the human body either does not produce enough of them or none at all. An organic compound contains carbon. When an organism cannot produce enough of an organic chemical compound that it needs in tiny amounts‚ and has to get it from food‚ it is called a vitamin. Sometimes the compound is a vitamin for a human but not for
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shell farthest from the nucleus. For example‚ sodium (group 1A) has an atomic number of 11‚ giving it 11 protons and 11 electrons in the neutral atom. This gives sodium one more electron than neon‚ the noble gas closest to it in the periodic table. In losing one electron‚ sodium forms a cation with a+1 charge‚ which still has 11 proton‚ but now has only 10 electrons in its electron cloud. What does this mean in terms of valence electrons? A neutral sodium atom‚ with an electronic configuration of 1s22s22p63s1
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ELECTRONEGATIVITY This page explains what electronegativity is‚ and how and why it varies around the Periodic Table. It looks at the way that electronegativity differences affect bond type and explains what is meant by polar bonds and polar molecules. If you are interested in electronegativity in an organic chemistry context‚ you will find a link at the bottom of this page. What is electronegativity Definition Electronegativity is a measure of the tendency of an atom to attract a bonding pair
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grams of iodine(V) oxide‚ I2O5‚ reacts with 28.0 grams of carbon monoxide‚ CO. Determine the mass of iodine I2‚ which could be produced? 80 g I2O5 1 mol I2O5 1 mol I2 1 333.8 g I2O5 1 mol I2O5 28 g CO 1 mol CO 1 mol I2 253.8 g I2 1 28 g CO 5 mol CO 1 mol I2 b) If‚ in the above situation‚ only 0.160 moles‚ of iodine‚ I2 was produced. i) what mass of iodine was produced? 0.160 mol I2 253.8 g I2 = 40.6 g I2 1 mol I2 ii) what percentage yield of iodine was produc
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Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation Preparing
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chemical reaction but does not become part of the end product. Amylase digests starch by catalyzing hydrolysis‚ which is splitting by the addition of a water molecule. The presence and absence of starch can be confirmed by several tests such as the iodine test‚ Benedict’s and Fehling’s test. In general‚ a blue-black color indicates the presence of starch. The objectives of this experiment are to examine the enzymatic activity and specificity of salivary amylase depending on changes temperature and
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TEXT BOOK OF BIOCHEMISTRY For 2nd year Medical Laboratory Technician Course (INTERMEDIATE VOCATIONAL) Author : S. Srinivasa Rao‚ B.Pharmacy‚ Jr. Lecturer in M.L.T.‚ Alluri Sri Rama Raju Govt. Junior College‚ Shanthi Nagar‚ Khammam. Editor : S. Kamalakar Rao‚ M. Pharmacy Senior Lecturer in Pharmacy‚ Department of Biotechnology‚ Govt. institute for post diploma courses in engineering and technology‚ Ramanthapur‚Hyderabad. INDEX Chapter I. Page No. Instrumental methods of Biochemical
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(Salters) AS level Chemistry UNIT 2 – F332 Elements from the sea Halogens and Halides (group 7 chemistry) * Halogen is the elemental molecule‚ eg/ Cl₂‚ Br₂ * Halide is in a compound‚ eg/ KBr‚ KCl | Fluorine | Chlorine | Bromine | Iodine | Appearance at room temp | Pale yellow gas | Green gas | Dark red volatile liquid | Shiny black solid – sublimes to purple gas | Halide | Colour precipitate with silver nitrate | KCl | White | KBr | Cream | KI | Pale Yellow | Redox
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determine the reaction order of the oxidation of iodine with respect to persulphate (part 1) and iodine (part 2). For part 1 of the experiment‚ this was done by titrating a solution of 50 cm3 of diluted 0.0225M persulphate and 250 cm3 of 0.4M potassium iodine against a 50 cm3 solution of 0.01 M solidum thiosulphate‚ using 3 ml of 2% starch as an indicator. For part 2‚ a solution of 25cm3 of iodine and persulphate‚ and 25 cm3 of 0.04M potassium chloride was titrated against the same amount of thiosulphate
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THE MOLE CONCEPT References : Mohammed and Lambert ( Old Edition) Chapter 11 pg. 107 Mohammed and Lambert ( New edition) Chapter 8 pg 123 Anne Tindale Chapter 10 pg 46 The following topics will be covered : 1. Definition of Relative Atomic and Relative Molecular Masses. 2. Calculation of Relative Molecular Masses 3. Converting Moles to Grams / Grams to Moles 4. Calculation from equations Masses of substances /Volumes of gases / Concentration
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