Cool-off time is 15 minutes 1] Defects modify the properties of crystals [4 marks] A] Give differences between Schottky and Frenkel defects [2.0] B] On heating zinc oxide becomes yellow in colour. Why? [1.0 ] C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0] 2] Colligative properties depend on the number of solute particles in solution [4 marks] A] Give the name of colligative property suitable for the measurement of molar
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Victor Summary The poem starts with Victor as a baby with his father saying‚ “Don’t dishonour the family name” and “Don’t you ever ever tell lies”. Victor then grows up and goes horse riding with his father before his father dies of heart disease on a frosty December‚ and buried him in the same month. Following the funeral‚ Victor’s uncle finds Victor a job at the Midlands Counties bank at the age of 18‚ which he was good at. Victor stayed at the Peverel‚ a boarding house when the clerks questioned
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MA‚ PAULINE Date Performed: 10 SEPTEMBER 2014 NACIONGAYO‚ DANIELLE Date Submitted: 17 SEPTEMBER 2014 TEDERA‚ YVES HEAT EFFECTS AND CALORIMETRY Experiment No. 2 I. RESULTS A. Determination of Heat Capacity In this experiment‚ an improvised calorimeter was used to determine the heat capacity. The calorimeter weighed 4.47 grams prior to the addition of water. Tap water‚ 40 mL to be exact‚ was added to the calorimeter which increased the weight to 43.87 grams. The water was measured using
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t Design and preparation of buffers effective at different pHs Abstract These experiments aimed to determine the optimum pH ranges various buffers are effective and provide opportunity for the use of the Henderson-Hasselbalch equation to prepare a buffer of a specific pH. Three different buffer systems were initially investigated; volumes of weak acid and weak bases of specified concentration were prepared and titrated against strong acid or strong base solutions with pH readings taken at frequent
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bonds. • Ionization energy- E is required to remove an e- • Electronegivity- desire for electrons highest closer the the right • Highest ionization energy is helium • Potassium bromine the element bromine forms an anion • Alkali metals +earth metals conduct electricity • Covalent bonds form when 2 elements with high electroneg share a pair of electrons • Covalent compounds- 2 elements with high electroneg bond • In nature there are pure elements and compounds
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Discussion no. 2 The Nomenclature of Inorganic Compounds Discussion no. 3 The Periodic Table of Elements Sta. Maria‚ Yza Suaco‚ Trisha Marie T. Teves‚ Joan Marie Vale‚ Kate IN-9 Group 9 I. Introduction Representing molecules as images allows us to impart a great deal of information concerning molecular structure. But these molecules can also be named‚ and there are occasions when this is more convenient than drawing a picture. In the early days of chemistry‚ the list of known compounds
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In order to determine the acidity of certain substances‚ we used moist and dry pH paper (litmus tests)‚ and observed the results. First we used dry pH paper to test the acidity of household ammonia‚ and it turned yellow. According to the legend‚ this indicates a weak acid. This is‚ however‚ not accurate as the vapor of the household ammonia wasn’t able to react as strongly with the pH paper since it was dry. Then‚ we used moist DI water pH paper with the same substance‚ household ammonia‚ and it
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DIPLOMA KEJURUTERAAN AWAM SEMESTER 2 ( JUN 2013 ) CC203-CONCRETE TECHNOLOGY AHLI KUMPULAN NAMA TAJUK CONCRETE MATERIALS AND MIXTURE NAMA PENSYARAH KELAS CONTENT PAGES INTRODUCTION 1 BASIC PROPERTIES OF CONCRETE 2-5 BASIC KNOWLEDGE OF CEMENT 6-9 STORAGE METHODS OF CEMENT 10-12 FINE AGGREGATES AND COARSE AGGREGATES 13-14 PROPERTIES OF WATER USED IN CONCRETE MIXTURE 15-19 BASIC CONCEPT OF CONCRETE MIX 20 FRESH CONCRETE 21-23 ROLE OF ADDITIVES
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THE COSMETICS INDUSTRY Few cosmetic ingredients are manufactured in New Zealand‚ and the cosmentic industry here involves mainly blending and packaging. However a wide range of products is made by a considerable number of companies. In this article the following products are discussed: • Surfactant mixtures for cleaning - shampoos‚ bubble baths‚ facial scrubs etc. • Stabilised emulsions - moisterisers‚ sunscreens etc. • Concealer products - make up • Alcoholic and hydroalcoholic solutions - colognes
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Whereas‚ the problem of KDML105 variety‚ the improvement of the local variety that has good quality and is not sensitive to light is the important target of Rice Improvement Project (Vanavichit et al‚ 2003). This improvement has led to the breeding of a new aromatic rice variety that can grow in irrigated areas with sufficient water for rice growing through the year. There was successful in 1997‚ when the Department of Agriculture certified three other cultivars of aromatic rice‚ namely‚ KlongLuang
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