A. Role of Chemistry in Society Applications of chemical science have contributed significantly to the advancement of human civilization (1‚ 2‚ 3). With a growing understanding and ability to manipulate chemical molecules‚ the post-World War II chemist was considered a societal problem solver. They synthesized crop-enhancing agricultural chemicals to ensure a constant and viable food supply. They played a significant role in the eradication of deadly diseases by developing life-saving pharmaceuticals
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The purpose of descriptive writing is to make our readers see‚ feel‚ and hear what we have seen‚ felt‚ and heard. Whether we’re describing a person‚ a place‚ or a thing‚ our aim is to reveal a subject through vivid and carefully selected details. Each of the five paragraphs below responds‚ in its own way‚ to the guidelines in How to Write a Descriptive Paragraph. The writers (three of them students‚ two of them professional authors) have selected a belonging or a place that holds special meaning
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Task: The exemplification paragraph. We all like to rest and one of the most widespread forms of rest is tourism. Everyone can find in it something that he or she likes. Some like mountains and rivers‚ others like to lie on a beach or to visit museums‚ and certain people prefer extreme tourism. Strangely enough however tense nerves can actually help some people to remove their weariness and help them to relax. With every passing year more and more people aspire to see the beauty of the
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abyss hole so deep as to appear bottomless acquiesce agree‚ accept without protest affable polite and friendly‚ easy to talk to affliction distress‚ suffering affluent wealthy‚ abundant agitate move‚ shake‚ stir up ambiguous having more then one meaning annex take possession of aqueous of or like water arduous demanding great effort‚ strenuous aroma quality or surrounding atmosphere considered typical atone make repayment avarice greed bellicose inclined to fighting calisthenics
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Lord Rayleigh and Sir William Ramsey succeeded in proving that there must exist a previously unknown gas in the atmosphere. They subsequently worked in their separate laboratories on this problem but communicated the results of their labors almost daily. At the meeting of the British Association in August 1894‚ they announced the discovery of Argon. They found the gas by isolating a small sample of the nonreactive portion of atmospheric nitrogen; once all the oxygen and nitrogen were removed from
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Calculations 1. Rounding Examples *0.1356 (4 significant figures) -> Round answer to 2 significant figures *0.1356 -> 0.14 *314.705 (6 significant figures) -> Round number to 4 significant figures. *314.705 -> 314.7 *0.0035771 (5 significant figures) -> Round to 3 significant figures. *0.0035771 -> 0.00358 *500‚000 (1 significant figure) -> Write this number to have 3 significant figures. *500‚000 - 5.00 x 10^5 *39.501 -> Round to 2 significant figures. *39‚501
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Appendix APPENDIX 1 Chemical tests for functional groups Homologous series/ Typical compound Functional group(s) Alkanes CH3CH3 ethane C – C and C–H Alkenes CH2 = CH2 ethene C=C Chemical tests/Observations Add liquid bromine in ultraviolet light (or sunlight): White fumes of HBr liberated; decolourisation of bromine occurs slowly (a) Add Br2 in CCl4 at room temperature: Decolourisation of bromine occurs immediately CH2 = CH2 + Br2 → CH2BrCH2Br (b) Add acidified
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In this quote‚ Chief Bromden says‚ “I been silent so long it’s going to roar out of me like floodwaters and you think the guy telling this is ranting and raving my God; you think this is too horrible to have really happened‚ this is too awful to be the truth! But‚ please. It’s still hard for me to have a clear mind thinking on it. But it’s the truth even if it didn’t happen.”(Act 1 32) Chief Bromden‚ a long-term patient in Nurse Ratcheds psychiatric ward‚ narrates the events of the novel. The novel
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Descriptive Paragraph One of the things that I treasure in summertime is my weekends. I start my day early‚ getting ready to ride in my boyfriend’s car‚ to pick up the boat from a friend. The boat is a camouflaged‚ flat bottom‚ twelve feet long; spray painted on one side is the name for the boat “Esox Lucius”. We get to the creek and Jake dismounts the boat‚ I help by bringing the fishing poles‚ tackle boxes and my bag down to the bank. The familiar creek where we go is not too wide‚ covered on
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Q. 1. During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains
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