Jody Kaur Pure Cultures Lab 1/31/13 Introduction : Pure cultures are made of only one type of organisms and can be used to study their properties. A method used to isolate pure cultures is making a steak-plate‚ which is a dilution process in which culture is spread over an agar plate in a certain manner. Using a loop rod‚ culture was taken from the tube and dragged across area 1 several time‚of the agar. The agar was then turned 90º‚ and the loop was flamed and cooled. Taking some culture
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yarns‚ paper‚ and textile fabrics”. There are many kinds of bleaches in the market contains different kinds of chemicals such as S and Cl‚ and they’re the two elements I am going to focus on introducing today. PPT 4 Firstly‚ it comes to sulfide bleach. The compound which is actually making the process is SO2‚ the oxide of S element. SO2 is a colorless‚ irritating-smell and toxic gas under S.T.P. and is released by volcanoes and in various industrial processes. Have you guys ever had the chance
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Report Classification of Chemical Substances Student: Saule Sadykova Lab Partner #1: Temirlan Atambaev Lab Partner #2: Almas Ospanbekov Instructor: Eugene Douglass Nazarbayev University Purpose The aim of this experiment is to investigate the properties of several substances with the purpose of determining whether they are molecular‚ ionic‚ macromolecular or metallic. Introduction Chemical substances could be named ionic‚ molecular or metallic substance‚ based on the kind of bond present
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A substance abuse addiction can be described in many ways. The NIDA states that a “drug addiction is a chronic disease”. People abuse drugs despite the many consequences that it can have‚ especially changes in their brain. The start of any drug addictions begins with the use of taking drugs over time. After taking drugs for an extended period of time‚ it becomes a compulsive behavior that has major long-term affects on your brain function (NIDA‚ 2016). Up until 1906‚ drinking and substance use
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Acenatilide is a synthetic organic compound introduced in therapy in 1866 as a fever-reducing drug. Its effectiveness in relieving pain was discovered soon thereafter‚ and it was used as an alternative to aspirin. The solvent that I selected to recrystallize the crude acenatillide was water. The pure acenatilide did not dissolve in water at room temperature but did dissolve in the water once boiled. The other possible selection would have been petroleum ether but the compound did not dissolve in the solvent
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FIW – Working Paper FIW Working Paper N° 121 April 2013 China ’s Pure Exporter Subsidies Fabrice Defever1 and Alejandro Riaño2 Abstract One third of Chinese exporters sell more than ninety percent of their production abroad. We argue that this distinctive pattern is attributable to the widespread use of subsidies that require firms to export the vast majority of their output. We study this type of subsidy in the context of a heterogeneousfirm model‚ and show that it is worse from a welfare
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There are many differences between an annotated bibliography and a literature review. An annotated bibliography is a compilation of citations‚ and this provides the reader the information needed to locate references. A literature review is based on a particular problem with some scientific knowledge and the current theoretical information. The annotated bibliography includes a description and explanation of the sources; a basic citation does not contain this (Carlson‚ 2003). Published studies
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evaluate primary and secondary standards Why are they used in analysis? A primary standard is a highly purified compound which acts as a reference in all titrimetric volumetric analysis. A secondary standard is titrants that is standardized against a primary standard or another standard solution and are used for certain types of analysis. A primary standard is a reagent that is extremely pure‚ stable‚ it’s not a hydrate/has no water of hydration and has high molecular weight. A primary standard is used
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How is it that 4 out of the 118 elements comprise over 96% of all living organisms? It is due to their reactive nature and ability to form bonds. One might ask why or how they are so reactive with other elements. Just as anything else in the universe seeks stability‚ so do atoms. Each of these 4 atoms seeks stability through their electrons. For example‚ hydrogen has 1 electron in its valance shell and it has the ability to fill that shell with up to 2 electrons thus it seeks another atom that
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My element is Mercury‚the atomic number is 80 and the atomic mass is 200.59.The symbol is Hg.Mercury comes from the greek name hydrargyrum which means liquid silver.The element is also known as quicksilver for its mobility. Named after the fastest-moving planet in the solar system‚ mercury has been known to humanity for ages.despite its toxic qualities‚ mercury can still be useful to us. The element conducts electricity and is used in electrical switches of thermostats and certain types of doze alarm-type
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