Subject Content Most of the objectives specified in this section relate to Knowledge with Understanding‚ although some indication has been given as to where the skills of Handling Information and Solving Problems may be developed. Teachers are reminded that‚ in the written papers‚ 40% of the marks are allocated to these higher ’thinking’ skills. In almost every section‚ students should therefore be given practice at dealing with unfamiliar situations so that these higher thinking skills can be developed
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Streptococcus pyogenes Research paper MCB 2010C March 17‚ 2014 Nature of Causative Organism Streptococcus pyogenes‚ a group A streptococci‚ is a gram-positive‚ non-spore forming bacteria that can be seen as oval cocci chain forming shapes less than 2 micrometers in diameter under the microscope. It is a facultative anaerobe that can use fermentation for its metabolism. It needs a blood containing medium to grow and exhibits beta-hemolysis. It is a non-motile‚ nonspore forming bacterium. S. pyogenes
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could then be calculated for. The experimental results revealed an average molar mass of 31.10g/mol for methanol (theoretical value of 32.04g/mol) and an average molar mass of 60.28g/mol for unknown # 20. which is closest to the molar mass of iso-propanol‚ 60.10g/mol. The differences in the molar masses of the experimental values and theoretical values may have been to sources of error such‚ as weighing the flask before it has fully cooled down to room temperature‚ or allowing too much vapour to escape
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In this experiment‚ ethanol-wetted sawdust is dried using a vacuum tray dryer. This type of dryer is an example of an indirectly heated batch dryer (Geankoplis‚ 2003). In indirect-heat dryers‚ heat is transferred mostly by conduction‚ but heat transfer by radiation is significant when conducting surface temperatures exceed 150°C (Brown‚ 1973). There are two ways in describing the mechanism of drying of the ethanol-wetted sawdust. First is through the basis of ethanol content versus time and
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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46202 This project was collaborated on by three different organic chemistry students‚ who individually synthesized and researched each of the three substitution reactions in this experiment.. The first reaction was an Sn2 reaction of 3-phenyl-1-propanol with NaBr and H2SO4 to create1-bromo-3-phenylpropane. Though multiple trials were ran no successful results of reaction one were obtained. Reaction two was a Sn2 of 2-pentanol with H2SO4 and NaBr. Changes were made to each run of the reaction‚ but
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Hair spray (also called hair lacquer or spritz) is a common cosmetic hairstyling product that is sprayed onto hair to protect against humidity and wind. Hair sprays typically consist of several components for the hair‚ as well as a propellant. Hairspray is commonly used by women. It is one of the most important products used in styling one’s hair. Hairspray can be easily removed by washing the hair. The hairspray coats the hair strand and connects it. Whenever they happen to touch‚ it helps to create
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highest percentage transmission. Beetroot was used for the experiment because it was easier to see the dye after the practical was completed. Putting beetroot cylinders into different boiling tubes‚ which contained three different standard solutions of Ethanol‚ they were left for half an hour at a certain temperature to get the dye out. Once the time was up‚ the solutions was added to cuvettes and inserted into the colorimeter to test how much light was passed through the sample. Preliminary Work:
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medicinal properties are. Lee‚ Park‚ and Yum (2012) studied the anti- oxidative properties of Taheebo. They used butanol and water to affect cell survival and tested the effect of Taheebo extract on these cells. The three serial extracts were selected for the study of regeneration on antioxidant enzyme activities because butanol and water extracts significantly affected cell survival. Treatment of hydrogen peroxide on the cells showed a dramatic repression
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Chemistry – Heats of combustion. To determine the heats of combustion of selected alkanols and to use this information to determine the heat of combustion for a longer chain alkanols. Formula ΔH=-mCΔT Heat of combustion ΔH/n = molar heat of combustion. Materials -100 degrees thermometer -glass stirring rod -aluminium beaker -electronic balance -bosshead and clamp -retort stand Method 1) Set up the apparatus as shown above. 2) Measure the weight of aluminium can 3) Use the
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