acceptable Lewis structure for the anion (CH2NCO)–? a. H C N C O H b. H C N C O H c. H N d. O H N C H C C H C O A) a B) b Ans: C C) c D) d Page 1 5. Which of the following is (are) valid Lewis structure(s) for the anion (HCONCH3) –? O H H a. C C H N H O H H C C H N H O H H C H N H b. c. d. a and b e. a‚ b‚ and c A) a B) b Ans: D C) c D) d E) e 6. Which of the following is (are) valid Lewis structure(s) for the anion (CH2NO2)–? Assume the atoms
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determine the concentration of M 2+ ( Mg 2+ or Ca 2+) metal ion impurities. Chemical principle or theory involved in this lab: To determine waters hardness we will use a technique called a chelometric titration. “When a neutral molecule or anion (lewis base) donates electron pairs and attaches itself to a metal ion center (a Lewis acid)‚ the resulting cluster of atoms forms a single ion called a complex. When such complexes form the electron donating groups are called ligands. When ligands
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Hydrogen‚ Nitrogen‚ Calcium‚ Phosphorus‚ Potassium‚ Sodium‚ Chloride‚ magnesium‚ iodine‚ iron For the statements below‚ highlight the correct word or fill in the blank as indicated: 1. A cation is an atom that has (lost/gained) an electron‚ giving it a (positive/negative) electrical charge. 2. An anion is an atom that has (lost/gained) an electron‚ giving it a (positive/negative) electrical charge. 3. A _electrolyte_ is an ionic compound that‚ when dissolved in water‚ dissociates into
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Examination Paper of Safety Management 5 IIBM Institute of Business Management IIBM Institute of Business Management Examination Paper MM.100 Industrial Safety Management Section A: Objective Type (30 marks) This section consists of multiple choice & Short Notes type questions. Answer all the questions. Part one carries 1 mark each & Part Two carries 5 marks each. Part One Multiple choices 1. _____________is one of the weapons in the creative armoury available to mangers. a. Brainstorming
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A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such as covalent or ionic bonds and "weak bonds" such as dipole-dipole interactions‚ the London dispersion force and hydrogen bonding
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CHEMISTRY REVISION GUIDE for IGCSE Coordinated Science This revision guide is designed to help you study for the chemistry part of the IGCSE Coordinated Science course. The guide contains everything that the syllabus says you need you need to know‚ and nothing extra. The material that is only covered in the supplementary part of the course (which can be ignored by core candidates) is highlighted in dashed boxes: Some very useful websites to help you further your understanding include: •http://www
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“WATER IS A GOOD SOLVENT” Water is very unique in all facets of its nature. The chemical formula for water is H2O as a water molecule consists of two atoms of the chemical element hydrogen (H) and one atom of the element oxygen (O). Water is the most abundant chemical compound on earth as its mass all exists together‚ naturally‚ in its gaseous‚ liquid and solid state. It is the most precious natural resource to man and is essential to life for all discovered living organisms. One of the unusual
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EXPERIMENT NO. 9 CHEMICAL EQUILIBRIUM Audrey De Castro FCD3‚ Group 9‚ Ms. Sarah Sibug Kristine Tavares March 27‚ 2014 I. ABSTRACT Chemical equilibrium is mostly involved in industrial processes such as synthesis
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FACTORS AFFECTING THE LYTIC ACTIVITY OF LYSOZYME ’ A. N. SMOLELIS" AND S. E. HARTSELL Laboratories of Bacteriology‚ Department of Biological Sciences‚ Purdue Univer8ity‚ Lafayette‚ Indiana Received for publication October 28‚ 1951 Since the initial discovery of lysozyme by Fleming (1922)‚ nuimerous attempts have been made to describe the properties of this enzyme. The absence of a reliable method for the determination of enzymatic activity‚ however‚ has contributed to the incompleteness and
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middle of the last century chemists generally understood that chemical elements can be grouped together in separate classes according to obvious similarities or dissimilarities in their properties. Thus‚ flammable alkali metals (that form stable cations) can be naturally separated from poisonous halogens (that
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