Name: __________________________________ ( ) Class: 4Q HWA CHONG INSTITUTION PRELIMINARY EXAMINATION 2010 CHEMISTRY 5072 Paper 1 Time: 1 hour INSTRUCTIONS TO CANDIDATES Do not turn the pages over until you are told to do so. Write your name and index number on the answer sheet in the spaces provided. There are forty questions on this paper. Attempt all questions. For each question‚ there are four possible answers labelled A‚ B‚ C and D. Choose the one you consider correct and
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The pursuit of knowledge carried on by scientists for the past several centuries has produced results over which opinion is sharply divided. Science‚ originally intended to conquer and harness the forces of nature for the good of man‚ is looked upon by some as the chief cause of the suffering of humanity today. On’the other hand‚ there are a good many people who consider science to be the harbinger of all progress‚ prosperity and comfort. The contro¬versy has been raging for a long time‚ though science
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Agriculture provides the basis of subsistence for the population by production of food and raw materials. Traditionally‚ the inhabitants of each country or region depended on the bread-basket filled by the farmers‚ for ex; everybody depended on agriculture and was interested in its outcome. In recent times‚ regional and international trade have reduced the dependence on home agriculture‚ and the quantity of available food is less a function of the harvest than of the political decision on the amount
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fought through struggles to become as successful as he was. Without help from his close friends and family members‚ he still got through the conflicts life threw at him. Edmund Ruffin‚ a man with a fighting spirit‚ successfully made a huge impact on agriculture alongside history. Ruffin was born on January 5th‚ 1794‚ in Prince George County‚ Virginia. His mother died whilst he was still an infant; although‚ his father‚ George Ruffin‚ remarried a few years later. Growing up without his real mother affected
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 0620/01 October/November 2008 45 Minutes *6400528663* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the
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CHEMISTRY OF NICOTINE Date Submitted: March 17‚ 2010 Introduction Tobacco has a long history and has had a significant impact since first introduced to Western society in the 16th century. There is evidence that Native Americans were using tobacco long before the 16th century. They smoked through a pipe for special religious and medical purposes but the worldwide spread of tobacco was initiated as a result of European discovery by Spanish‚ Portuguese and French explorers.(1‚2) Christopher
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crops without using any chemicals‚ i.e.‚ without using either a single granule of chemical fertiliser or a single drop of plant protection chemicals. Even though greater than 60% of the Indian population derives their livelihood from Agriculture‚ the share of agriculture in Indian GDP is only 19%. This is because of
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A Comparative Study On The Combustibility Of Ethanol (C2H5OH) And Hydrogen Peroxide (H2O2) Mixtures As Fuel Chemistry January 31‚ 2013 Revised February 15‚ 2013 Abstract In this experiment‚ the proponents used mixtures with varied proportions of ethanol and hydrogen peroxide to know which would make a more efficient‚ clean‚ and stable combination. Compared to conventional fuels‚ ethanol contains 36% oxygen thus resulting in more complete combustion. This greatly lowers
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in to account that honey is a more viscous liquid as compared to ink. Therefore the low viscosity of ink allows it to diffuse at a faster rate than honey in a solution. Q-9 Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature ? Carbon-di-oxide and Oxygen are the two atmospheric gases‚ that can diffuse in water. Oxygen is helpful for the animals inside the water and CO2 is helpful for plants in the water The oxygen from lungs diffuses into
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During the period 1876-1900‚ there were many different changes to American agriculture. Prior to the American Civil War‚ the United States started a systematic policy of territorial expansion across the continental United States. During this process of expansion‚ land was gained from the Native Americans and the Mexicans through different wars and treaties. However‚ the changes that technology‚ government policy‚ and economic conditions caused shall be explained. The Industrial Age accentuated
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