Chemistry Internal Assessment Title: Determination of the percentage (%) of ethanoic acid in vinegar Date Experiment was performed: 1st April 2011 Criteria Assessed: DCP‚ CE Apparatus: 2 conical flasks 1 250cm3 volumetric flask ±0.30cm3 Electronic Balance ±0.10g 50cm3 Burette±0.1cm3 25cm3 Pipette±0.06cm3 Materials: 0.20M HCl (±0.02moldm-3) 1.1g solid NaOH (±0.1g) A solution of vinegar of unknown concentration (density= 1.05gcm-3) Phenolphthalein Method: * A solution of NaOH was
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in test tube). The bubble production of each test tube were measured in centimetres. The amount of bubble produce were measured because when a chemical reaction occurs‚ gases form. Hence‚ by measuring the bubble production of each test tube‚ the optimal temperature in which enzyme’s catalytic activity is most proficient can be observed. The bar graph demonstrates a vast variation between the bubble production (in cm) at each independent variable‚ proving that temperature has a significant impact
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A Method to Determine Reasonableness and Feasibility of Noise Abatement at Special Use Locations I. INTRODUCTION Most states have policies in place that determine whether noise abatement is necessary and reasonable/feasible for Type I projects. These policies mirror federal guidance and apply to various land uses near the proposed project. Special land use facilities such as parks‚ churches and schools are included in the policy as far as when abatement may be necessary (i.e. the Federal Highway
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The synopsis of this article relates to how a group of researchers from Riverside‚ California have revealed a molecular mechanism that directs the chance and role of cells during the process of animal development. The researchers’ discovery shows remarkable findings that are promising in the advancement of cancer and stem-cell research. The hypothesis of this article relates to even though each individual cell contains the complete DNA code‚ only small portions of this DNA code are activated. Therefore
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Antibiotic test‚ such as the Kirby Bauer Method‚ are used to determine susceptibility to various antimicrobials. Why are they not used to determine resistance? a. They grow a resistance to antibiotics and antimicrobials. Kirby Bauer is used to determine diffusion of a disk‚ to measure the effectiveness of antibiotics towards pathogenic microbes. 4. Compare and contrast the following terms: antiseptic
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Johannes Kepler and Rene Descartes that the speed of light was infinite‚ having the ability to travel at any distance immediately. A notable physicist named Galileo Galilei was one of the first scientists to ponder this phenomenon of light‚ and how to determine the speed of this unknown. In order to do so‚ Galilei formulates an experiment with an assistant. While standing on one hilltop‚ and his assistant standing on another farther away‚ both held a lamp that could be uncovered and covered whenever they
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HOW DEMAND DETERMINES OUTPUT IN THE SHORT RUN Typically‚ firms that supply intermediate goods such as steel rods or other inputs let demand not price determine the level of output in the short run. To understand this idea‚ consider an automobile firm that buys material from a steelmaker on a regular basis. Because the auto firm and the steel producer have been in business with one another for a long time and have an ongoing relationship‚ they have negotiated a contract that keeps steel prices
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vacation. What did you do to fill those two months? Most kids would just sit around all day waiting for school to start. But if you were out trying new things and meeting different people‚ Thomas Jefferson would be proud. As Jefferson once wrote: "Determine never to be idle... It is wonderful how much may be done if we are always doing." I agree with this statement and believe that staying active will ultimately lead to progress. For instance‚ while Bob sits waiting for the jobs to come to him‚ Sally
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The financial decisions of any type of an organisation can be divided into two categories. The first of these is concerned with spending – what spending decisions should be made in order to suffice a particular organisation’s future goals‚ which might be expressed in terms of profits‚ success in competition‚ new product development‚ growth and so forth. However‚ in order to realise these visions‚ each company necessarily needs to make decisions falling into the second category which is concerned
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When muscles of the body are exposed to electric shock‚ the muscles contract‚ the heart muscle goes into fibrillation electric shock can result in death AC is much more dangerous than DC An electrical shock is experienced when a person become part of an electric circuit. As a result‚ current enters at one point and leaves by another. The severity of the shock is determined by three main factors: The amount of current flowing through the body; The path of the current through the body. The great
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