March 19‚ 2014 Jennifer Hopkins 3110 Mustang Road Alvin‚ TX 77511 Dear Ms. Hopkins: I hope you enjoyed your Spring Break. You have been an amazing teacher‚ delivering humor‚ personality‚ and superb lessons in your classroom. Since mathematics is formula based and does not alter‚ each course builds onto the last; therefore each class taken in high school aids in college‚ in the workplace‚ and life in general. However‚ having the knowledge base is not the sole component in being successful
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There are two ways of looking at this question. Points in favour of abolishing them:- � *The approach of present examination systems means the beginning of fear‚ tension‚ anxiety and stress in the minds of the students under which if a student doesn’t performs according to his/her parents expectations may lead to students even taking the extreme step of ending their life by doing suicide. � *Some people also think that exams are not a reliable test of gauging the ability of the students as
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1. What is the ideal solvent for crystallization of a particular compound? What is the primary consideration in choosing a solvent for crystallizing a compound? volatile in order to be easily removed from the purified crystals. In selecting a solvent consider that like likes like. Polar compounds dissolve polar compounds and non-polar compounds dissolve non-polar compounds. Solvent will dissolve a large amount of the impure compound at temperatures near the boiling point of the solvent the compound
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stain used to color the cells that lost the primary stain in the technique gram+ and gram- slides are heat fixed and prepared for staining. Then the application of the primary stain- crystal violet which is what gives it the purple color Followed by an Iodine mordant to rinse the primary stain and set the crystal violet inside the peptidoglycan cell walls of the gram+. The cell is than washed with decolorizer Alcohol‚ the gram positive cell will remain purple and gram negative cells dye will rinses
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purpose of this lab was to collect and observe microorganisms from the environment and the human body and placing into the appropriate media using aseptic transfer techniques. The necessity and value of collecting‚ identifying and analyzing is critical for learning how diseases are acquired‚ spread and therefore prevented. Materials Sterile nutrient agar petri dish Wax Pencil Lens paper Sterile blood agar petri dish Igniter Immersion oil Sterile cotton swabs Crystal violet dye Pen Incubator
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the light‚ water‚ and CO2 were creating photosynthesis. 6. List the four common pigments found in plants and their functions. 1. Anthocyanin is red or purple and helps protect the plant from ultraviolet damage. 2. Chlorophyll a absorbs mainly blue violet and red light. It participates directly in the light reactions. 3. Chlorophyll b absorbs mainly blue and orange light. It broadens the range of light that a plant can use by conveying absorbed energy into chlorophyll a which then puts the energy to
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cheese. Lactic acid bacteria(LAB)‚ a bacteria that can be found in the production of cheese‚ its stress gene was investigated in the experiment by using various biochemical and genetic techniques to identify and extract. The characterisation of the strain illustrates how identification of strains differ using different methods‚ such as gram stain and 16s rRNA screening. After the characterisation‚ the stress gene isolation assist the further understanding of the gene on LAB be giving different stress
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CHEM 2510 Laboratory Report: Recrystallization and Melting Points Cover Page: Recrystallization and Melting Points by Lab Instructor: January 28‚ 2014 Purpose: The purpose of this experiment was to recrystallize a 95% pure sample of benzoic acid contaminated with approximately 5% salicylic acid using two different methods to determine the melting points and discover the impurities of the substance
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Example lab report of Synthesis of potassium tris (oxalato) ferrate (III) trihydrate Posted by Nurul Yunaliyana Experiment 5: Synthesis of potassium tris (oxalato) ferrate (III) trihydrate Purpose: to synthesis potassium tris (oxalato) ferrate (III) trihydrate ‚K3 [Fe (C2O4)3].3H2O. Introduction: Ferrous ammonium sulfate‚ Fe(NH4)2(SO4)2.6H2O is dissolved in a slightly acid solution‚ excess oxalic acid‚ H2C2O4‚ is added and the following reaction takes place: Fe(NH4)2(SO4)2.6H2O + H2C3O4
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Introduction Chemical kinetics is the study of reaction rates. A reaction rate is the speed of the change in either reactants or products over a period of time. General kinetic rate equation is: Where [A] and [B] are the concentration of the species in the reaction. The variable k is the rate constant‚ which is a function of time and catalyst presence. The variables m and n are the order of reaction for their respective species concentration. The higher the value of the reaction order the
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