solution‚ CaCl2(s)‚ xylene‚ t-butyl peroxybenzoate‚ methanol‚ 5% aqueous solution of 1‚ 6-hexanediamine‚ NaOH(s)‚ 5% sebacoyl chloride in hexane‚ glacial acetic acid‚ concentrated H2SO4‚ cotton balls‚ acetic anhydride‚ CH2Cl2 Procedure: For the synthesis of polystyrene‚ 10 ml styrene and 20 ml of 1 M NaOH solution was placed in separatory funnel and they were shaked for several times. Aqueous layer was discarded. The styrene layer was washed with water and dried with CaCl2(s). The styrene was placed
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IGCSE First Language English: Coursework Paper 4. Name: Kevin Koku Donkor Essay Type: Argumentative Topic: Does foreign aid continue to be beneficial to African countries? All over the world‚ aid is given by individuals‚ private organizations‚ or governments to countries in need‚ especially countries in Africa. Foreign aid can be described as the international transfer of capital‚ goods or services in the form of grants or loans. Aid can be given to a country in the event of a crisis‚ for developmental
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Filtrate White needle-like crystals Residue Cloudy white liquid with slightly undissolved solids Crude Aspirin White needle-like crystals Table 4. Recovery Data. Recrystallized Aspirin Wt. of watchglass + filter paper 53.081g Wt. of watchglass + filter paper + product 55.995 Weight of product 2.914 Theoretical Yield 2.61g % Yield 111.65% Table 5. Melting point determination. Crude Aspirin Recrystallized Aspirin Melting point 118-130°C 134-136°C Literature value 135°C 135°C
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According to Figure 4 and 5‚ the moles of Cu initially obtained and at completion‚ differentiated. It was evident that the initial moles of Cu (0.0254)‚ did not regenerate all the amount‚ as 0.0124 moles of Cu was attained. In regards to this‚ the no. moles that was eliminated was approximately‚ 0.013. Respectively‚ in Figure 3‚ a large deviation amongst the initial and final quantity of copper‚ this implies that the rest of the mass that had diminished‚ was greater than the final product. These
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Kristian Jore Bethany Frerichs WRIT-202 03/18/2013 Final draft Analysis of “We should cherish our children’s freedom to think” “We Should Cherish Our Children’s Freedom to Think” is written by Kie Ho and expresses his belief of the education in the US. Throughout the article he argues that the American school system “is not perfect‚ but it is a great deal better than any other” (Ho‚ 2007‚ p. 114). His arguments are reflected through his thoughts and experiences but are weakened by vague evidence
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Have you ever wondered why your voice matures when you get older? Well that’s because your vocal cords grow longer making you voice deeper. A male’s voice gets way deeper than a female’s voice though. A male’s larynx grows bigger during puberty making the voice deeper. For some people‚ if you sing‚ that means that your vocal range can increase easily. But if you don’t sing‚ it isn’t necessary for your vocal range to increase. As you grow older‚ your larynx hardens making your voice seem a little
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and lower the self esteem of many women. Because of the shame‚ the topic of periods can be hard to talk about for the homeless‚ which means seeking help is even harder. This source also introduced the problems of bathrooms that provide free toilet paper‚ but do not provide feminine products. However‚ this article concludes that even if feminine hygiene products become more easily accessible‚ women will still have a tough time on finding safe areas to
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Over the past couple of decades there has been a huge increase in the diagnosis and prescriptions given out for Attention Deficit Hyperactivity Disorder. According to a news report done by USA Today over the past five years use of ADHD medications have risen 40% totaling 39.5 million individual prescriptions ("New findings‚" 2009). When statistics like this are seen it is only normal for someone to ask questions. People are becoming curious about the legitimacy of the disorder‚ and whether or not
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industrial settings due to the simplified synthesis and safety parameters of the overall reaction. Both benzoic acid and methanol are relatively cheap to obtain from a commercial source as well as being easy to store with a relatively long shelf life. The Fischer esterification method is a fundamental and important synthesis process in training our future chemists in both commercial and academic employment and principles. By utilizing this method of synthesis‚ the chemist has the knowledge to utilize
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but all cultures. By determining which artifacts should be secured‚ the audience should be considered. The person responsible needs to consider how the works will appeal to a specific group of individuals. Different kinds of artifacts‚ such as‚ paper‚ photos‚ or pottery will have very different effects on a given
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