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Report1.123 Words / ~ pages Gymnasium Kloster Disentis Chemistry Lab Report from the 19th December 2011 Introduction In the chemistry lab on Monday the 19th December 2011, we were supposed to recognize that different salts can change the colour(s) of a flame. We gave with each salt a little ethanol (just as much that the floor of the petri dish was covered and maybe a little bit more) to a petri dish, mixed it well with the spoon spatula, ignited the mixture and than noted the colour(s) of the flame and how the flame changed. While the mixture was burning, we took a video from the event. Every time the experiment with one type of salt was done (it ended to burn when the ethanol was burned away), we had to wash the petri dish and the spoon spatula. Than we started the experiment new with another salt and a bit of ethanol and this we did seven times. Materials and Methods Our materials: -two little petri…[show more]
Report830 Words / ~ pages Gymnase Lausanne TP : Lâge de glace. But : Nous allons observer leau durant ses changements de phase. Dans un premier temps nous allons nous intéresser à son changement détat de liquide à solide, puis dans un deuxième temps, dans son changement détat de solide à liquide. Nous allons mesurer les températures et tenter de expliquer et déterminer les différences entre ces deux changements de phase. Liste des produits : - Eau liquide (H2O) - Glace (H2O) - Sel de cuisine (NaCl) Hypothèse : Quand nous mettons de leau liquide à température ambiante dans un congélateur, elle gèle. Ce phénomène sexplique par la transfusion thermique, ce qui veut dire que le milieu le plus chaud va réchauffer le milieu le plus froid jusquà quils aient une température égale. Dans ce cas-là, leau liquide va se refroidir jusquà atteindre la température du congélateur, celle-ci…[show more]
Handout533 Words / ~6 pages UNH Durham Hindenburg Reaction - Combination Reaction Formula: A + B = AB 2H2 + O2 à 2H2O + E Hydrogen gas reacts with oxygen which produces water and energy This is an exothermic reaction because energy is produced. This reaction is what was happening when the Hindenburg exploded and burst into flames. Atomic Conceptual Drawing Exploding Bubbles – Combustion Reaction Formula: Fuel + O2 = CO2 + H2O C3H8 + 5O2 à 3CO2 + 4H2O Propane reacts with Oxygen which produces Carbon Dioxide and Water Propane is very flammable, so when mixed with oxygen to create a bubble solution the bubbles become highly flammable. So when the bubbles are in the air and meet with a flame the bubbles bursts into flames. Atomic Conceptual Drawing Genie in a Bottle – Decomposition Formula: AB= A + B 2H2O2 à 2H2O + O2 Hydrogen Peroxide is decomposed to produce Water and Oxygen This…[show more]
Homework609 Words / ~3 pages 3.lf UK Prague 3. Фосфор и фосфаты Фосфор Местонахо­­ждения / получение Фосфор происходи­­т в природе не первонача­­льно (не естествен­­ного происхожд­­ения?), а в виде фосфатов только в связанном состоянии из-за его высокого сродства к кислороду­­, например, в минералах­­, таких как апатит и фосфорит. Фосфор происходи­­т как гидроксиа­­пит в костях и зубах позвоночн­­ых ( у позвоночн­­ых животных). Свойства Как и сера и углерод, он подвергае­­тся нескольки­­м модификац­­иям, которые являются взаимопре­­вращаемыми а) Белый фосфор представл­­яет собой восковую, молочно-п­­лупрозрач массу (т. Пл. 44 ° С) молекул Р4, расположе­­нных в тетраэдре­­. Это исходный материал для представл­­ения всех других модификац­­ий…[show more]
Homework993 Words / ~ pages gustav heinemann gesamtschule Vor- und Nachteile der PET- Flasche Im Folgenden möchte ich auf die positiven wie auch die negativen Eigenschaften der PET – Flasche eingehen. Die PET- Flasche ist ein idealer Alltagsgegens­tand aufgrund ihres geringen Gewichtes, der bequemen Handhabung und vor allem ist sie nicht bruchanfällig­. Diese Eigenschaften sind ins - besondere für Kinder von Vorteil, weil das Verletzungsri­siko stark minimiert wird. Lässt das Kind beispielsweis­e die Flasche fallen kommt es zu keinem Bruch wie bei einer Glasflasche und somit besteht keine Gefahr, dass das Kind sich an Scherben verletzt. In PET- Flaschen kann man ein wirksames und sehr simples Verfahren zur Wasserentkeim­ung (SODIS) anwenden. SODIS steht für Solar WaterDisinfec­tion, was so viel bedeutet, wie Desinfizierun­g des Wassers durch die Sonne. Die UV-A- Strahlung im…[show more]
Examination questions2.117 Words / ~15 pages Technische Universität Graz - TU Biochemistry II Exam Questions Prüfungsfrage­n Biochemie II 29.02.2008 06.03.2009 08.01.2010 Fatty acid biosynthesis 1. Which of the following statements concerning fatty acid biosynthesis are correct? If incorrect, give the correct answer! (2 points each) Fatty acid biosynthesis uses acetoacetate as a donor of C2 units. Wrong, it uses Malonyl CoA Fatty acid biosynthesis occurs in the mitochondria while beta-oxidatio­n (degradation of fatty acids) occurs predominantly in peroxisomes. Wrong, fatty acid Biosynthesis occurs in the Cytoplasm; β-Oxidation occurs in the Mitochondira Fatty acid biosynthesis and beta-oxidatio­n use NADH/NAD+ as donor/accepto­r of electrons (hydrides). Wrong, Biosynthesis of fatty acids uses NADPH; β-Oxidation uses NADH Fatty acid synthase primarily synthesizes myristic acid (C-14);…[show more]
Examination questions1.440 Words / ~ pages Hong Kong Polytechnic University Q1)What are the general purposes of textile coloration? Color is one of the most significant factors in the appeal and marketability of textile products. Textile coloration is used to enhance the aesthetics and beautificatio­n. Q2)Briefly describe how to complete an exhaust dyeing process? Exhaust dyeing is a kind of batchwise dyeing. It dyes in rope form by using Overflow/Jet Dyeing Machine or dyes in open width form by using beam dyeing machine. First, choose a dyeing machine based on the fabric dyeing form. We should remember the fabric wight before dyeing which is going to be dyed and then calculate dyestuff weight on weight of fabric weight in percentage. Also, we have to calculate the water amount based both the fabric and machine to get the liquor ratio. In dyeing process, salt, soda ash and dyestuff are needed. Putting leveling…[show more]
Protocol577 Words / ~7 pages HTL Braunau 3rd class, Group 3 Protocol Qualitative Proof of Mixtures Laboratory Days (Date) Experiments, Theory, others. 1: 21.11.15 Theory 2: 28.11.16 Practice with known Substances 3: 05.12.16 Obtained the unknown Mixtures 4: 12.12.16 Identificatio­n of the Mixtures A total of 8 Lessons were spent with the Tasks. Due Date of the Protocol: 19.12.16 Index 1. Task. 3 2. Theory and Equipment 3 2.1 Theory „Qualitative Proof“ 3 2.2 Single proofs of Anions. 4 2.3 Single proof of Kations. 5 2.3 Used Equipment, Chemicals and Solutions. 5 3. Safety Measures. 6 3.4 Results. 6 3.4 Mistakes. 7 5. Literature. 7 1. Task We should test 12 unknown mixtures of one cation and one Anion and look of what it consists. 2. Theory and Equipment 2.1 Theory „Qualitative Proof“ Qualitative analysis is concerned with the detection of chemical elements, functional…[show more]
Term paper2.026 Words / ~12 pages Martin College Brisbane Gas Laws and Global Effects Contents Intro: 2 What effects a gases behaviour?. 2 What are gas laws?. 2 Boyles law 2 The bigger picture. 8 What is global warming?. 9 Colclusion. 10 Bibliography. 12 Intro: Have you ever wondered why aerosol cans explode? Or been amazed at how hot-air balloons, such a gigantic object, is able to fly. To understand these bizarre happenings the behaviour of gases must be understood. This article will explain gas laws, sets of rules that govern the behaviour of ideal gases, and how gas laws apply in real life situations. What effects a gases behaviour? Temperature, pressure, volume and the number of moles of a gas all have an effect on the way gases behave(wilbra­ham, staley, & matta, 1995). Luckily now with gas laws it is easy to predict what will be the result when one or more of the parameters are changed. What…[show more]
Lesson preparation2.011 Words / ~10 pages University of Arts of London, London TEMA 1 TEMA 1 CONFIGURACIÓN ELECTRÓNICA, ENLACE Y ESTRUCTURA DE COMPUESTOS ORGANOMETÁLIC­OS DE METALES DE TRANSICIÓN 1. Introducción; 2. Estado de oxidación; 3. Configuración electrónica; 4. Clases de ligandos; 5. Enlace; 6. Estructura. 1. INTRODUCCIÓN Casi todos los grupos funcionales se coordinan a algún metal de transición, y con ello la reactividad de ese grupo funcional suele cambiar drásticamente­. Las especies nucleofílicas se pueden hacer electrofílica­s y viceversa, compuestos estables pueden hacerse altamente reactivos y viceversa. La reactividad de los grupos funcionales puede invertirse y algunas reacciones imposibles en condiciones normales se pueden lograr con facilidad. Intermedios de reacción altamente reactivos en condiciones normales se pueden estabilizar hasta convertirlos en reactivos…[show more]
Summary862 Words / ~ pages Sint-Jozefcollege Turnhout - SJT Chemie: Samenvatting OH 1 Hfdst. 5: Zuur-basereac­ties Herhaling Arrhenius stelde dat: - Zuur = deeltje dat in water H- afsplitst Vb: HCL -> H+ + Cl- - Base (hydroxide) = een deeltje dat in water OH- afsplitst Vb: NaOH -> Na+ + OH- Theorie van Bransted – Lowry - Zuur = protondonor: geeft proton af Vb: HCl -> H+ + Cl- - Base = protonaccepto­r: neemt een proton op Vb: NH3 + H+ -> NH4+ - Bij zwakke elektrolyten: evenwichtsrea­ctie ð Slechte geleiding: splitst niet volledig Vb: CH3COOH -> CH3COO- + H+ - Sterk elektrolyt: evenwichtsrea­ctie met evenwicht zeer sterk naar rechts Vb: HCl -> Cl- + H+ - Een zuur dat een proton heeft afgegeven, wordt in een geconjugeerde base omgezet. - Een base dat een proton heeft opgenomen, wordt in een geconju..…[show more]
Summary719 Words / ~ pages Gymnamsium Sacre Coeur Vienna SILICATES General infromation Silicates can either emerge through felsic (feldspar + silica) or mafic (magnesium + ferric (=iron)) formation. The first occures in granites and is usually lighter in weight and in colour due to the low percentage of iron and magnesium. Good examples would be the quartz or the k-feldspar. Whereas the second group is formed in upcoming lava that fills the gaps between the tectonic plates and tends to be dense and dark. Basalt, gabbro and pyroxene belong to that category. Approximately 2000 (30%) of all known minerals are silicates. It is therefore the largest and most important class of rock-forming mineral. Moreover nearly 95% of the Earth’s crust is composed of silicates. Silicon, Silica, Silicate Silicon is a chemical element of the periodic table with the atomic number 14. Its symbol is Si.…[show more]





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