01207030/JANUARY/F 2006 SECTION A Answer ONE question from this section. 1. (a) (i) Describe the processes involved in photosynthesis. (6 marks) (ii) Identify TWO characteristics of the leaf that make it an effective photosynthetic organ and state how EACH characteristic mentioned facilitates photosynthesis. (4 marks) (iii) How is it possible for a plant to survive after losing all of its leaves? (2 marks) (b) The phenomenon of swarming occasionally occurs in some insect species‚ such as locusts
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soil contains less than twenty percent of the necessary organic nutrients needed to meet our current food production. Carbon‚ hydrogen‚ and oxygen used to synthesize compounds needed for structural integrity are readily available from air and water. Nitrogen‚ phosphorus‚ and potassium‚ the building blocks for healthy plants‚ are usually not present in sufficient amounts in the soil to support plant growth. These are known as macronutrients. In addition‚ micronutrients‚ such as calcium‚ sulfur‚ and magnesium
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Latest Invention: Tea Bag that Uses Nanotechnology to Clean Drinking Water One of the latest inventions developed by researchers from Stellenbosch University in South Africa is a one of a kind "tea bag" that makes use of nanotechnology to clean drinking water‚ making it free from contaminants and bacteria. It would be interesting to note that the "tea bag" is made of the same material that is used to make the actual tea bags. The only difference is that in the Stellenbosch researchers’ invention
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GRAAD 12 NATIONAL SENIOR CERTIFICATE GRADE 11 PHYSICAL SCIENCES: CHEMISTRY (P2) EXEMPLAR 2013 MARKS: 150 TIME: 3 hours This question paper consists of 13 pages‚ 1 data sheet and a periodic table. Copyright reserved Please turn over Physical Sciences/P2 2 NSC – Grade 11 Exemplar DBE/2013 INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK. 2. This question paper consists of TWELVE questions. Answer ALL the questions in the ANSWER BOOK. 3. You
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H2O The feed of 90% Ethanol is kept in a storage tank with an air vent. Tank blanketing is used in the storage tank with Nitrogen gas. This is to prevent contamination of the feed. Nitrogen tank blanketing will reduce the oxygen level in the tank‚ and thus reduce the risk of fires and/or explosions posed by Ethanol‚ which is a volatile and combustible substance. The Nitrogen gas will exit from the air vent‚ preventing it from flowing into the process. The feed is pumped from a pressure of 1
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How fast is your reaction? Part 1 – How temperature affect the rate of reaction Chemical equation Magnesium + hydrochloric acid → magnesium chloride + hydrogen Mg + 2HCL → MgCl2 + H2 Graph Conclusion and questions 1. What factors/variables did you keep the same in this experiment? * We kept the same volume of hydrochloric acid (10 cm3) and the magnesium ribbon (5cm) because that way we could get a fair test experiment. We also repeated
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produce the most common pollutants‚ nitrogen oxides‚ gaseous hydrocarbons‚ and carbon monoxide‚ as well as particles of matter like lead. When nitrogen oxides combine with hydrocarbons they form other types of pollutants‚ like ozone‚ peroxyacetylnitrate which stings the eyes‚ and nitrogen dioxide which forms when nitrogen oxides react with oxygen. In cities where transportation is the major cause of pollution‚ nitrogen dioxide colors the sky brown‚ because the nitrogen dioxide has combined with other
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A fire occurred in a transformer vault that supplied power to a pesticide storage warehouse. The warehouse also caught fire. The warehouse was located in a rural area. There was a river adjacent to the warehouse that was the source of drinking water for a town downstream of the warehouse. The chemical products that were used in the transformer and the chemicals that were stored in the warehouse were all industrial strength and were supposed to be handled with extreme caution. All of these chemicals
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under pressure. Colourless Intensely irritating ammoniacal odour‚ with an odour threshold of 5-53 ppm Soluble in water alcohol and ether. pH of 11.7 Flammability limit of 15.5-25% Auto ignition temperature of 651C Elemental hydrogen and nitrogen gas are abundant and inexpensive. Using temperature 500C and pressure 150-200 atm‚ iron catalyst. Applications Mainly Fertilizer explosives such as TNT and ammonium nitrate Nylon Used for making ice and air conditioning units Used as a cleaning
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ACKNOWLEDGEMENT I express my deep sense of gratitude and indebtness to Dr. Amarjeet Singh Walia‚ HOD of Chemical Engineering Department‚ Seth Jai Prakash Mukand Lal Institute Of Engineering & Technology‚ Radaur‚ Yamunanagar who had provided me a golden opportunity to get my practical training in National Fertilizers Limited‚ Panipat‚ Haryana. I also wish to acknowledge my deep obligation to and all officers of HR Department for the kind behavior‚ constant inspiration and valuable knowledge
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