Trees occupy an important place in the life of man. The trees provide us flowers‚ fruits‚ fodder for animals‚ wood for fire and furniture and provide cool shadow from scorching sun. They give us so many such good things and yet expect nothing in return. Trees give us fruits for food and flowers for pleasure. They provide us timber (wood) for building our houses and making furniture. They provide us wood for fuel. They supply sleepers for the railway line. Many trees provide us medicinal products
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Importance and Value of Trees Since the beginning‚ trees have furnished us with two of life’s essentials‚ food and oxygen. As we evolved‚ they provided additional necessities such as shelter‚ medicine‚ and tools. Today‚ their value continues to increase and more benefits of trees are being discovered as their role expands to satisfy the needs created by our modern lifestyles. Community and Social Value Trees are an important part of every community. Our streets‚ parks‚ playgrounds and backyards
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SK0013 PHYSICAL CHEMISTRY – TUTORIAL 2 MATTER II 1. Given the formula K2CO3‚ determine the percent composition (fraction of K‚ C and O) of potassium carbonate (K2CO3 = 138.205 g/mol). 2. A compound has the following composition: C=40%‚ H=6.67%‚ O=53.3%. Its molecular weight is 60.0. Derive its molecular weight. 3. Determine the molar concentration of each of the following solutions: a) 166 g KI per L solution b) 33.0 g (NH4)2SO4 in 200 mL solution c) 12.5 g CuSO4.5H2O in 100 mL solution
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COORDINATION COMPOUNDS: * FLEXIDENTATE CHARACTER OF POLYDENTATE LIGANDS; * Poly dentate ligands have flexi dentate character in the sense that all donors atoms may not form coordinate bonds with the central metal atom or ion. For example; EDTA which is the hexa dentate ligand also acts as tetra dentate or penta dentate in certain complexes. Similarly sulphate ion‚ which is a bi dentate ligand‚ also acts as a mono dentate ligand in certain complexes‚ e.g. in [Co(SO4)(NH3)5]Cl. * LABILE
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2009 ICAS G paper ANSWERS 1. A 2. A 3. C 4. D 5. B 6. C 7. A 8. C 9. A (wind energy is renewable) 10. B 11. B 12. D 13. D 14. B 15. B 16. B 17. B? 18. B (the average change in mass is greatest) 19. A 20. A 21. C (because they are reflectors they need to be under the water to reflect the sunlight back up to to the water) 22. B? 23. C 24. C (the amount of liver changes but the other variables remain the same) 25. A (the temperature changes but the other variables remain the same) 26. B 27. C (ie‚
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Vu Ngo % MgO Determination September 10‚ 2012 Procedure: Reference to lab manual Data: Mass of Na2EDTA∙2H2O‚ g | .9289 | Standardization of EDTA Solution | Trial 1 | Trial 2 | Final buret reading‚ EDTA (mL) | 18.5 | 36.7 | Initial buret reading‚ EDTA(mL) | 0.5 | 18.5 | Determination of % MgO of Unknown Unknown Number | 4J | | Sample 1 | Sample 2 | Sample 3 | Mass of sample (g) | 0.2135 | 0.2132 | 0.2139 | Final buret reading‚ EDTA (mL) | 73.5 | 74.2 | 74.2 | Initial
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Beanium Investigation The purpose of this investigation was to find the average atomic mass for the element Beanium with three isotopes. The average atomic mass is the average mass of the atoms of the element divided by the total number of atoms. An isotope is an atom with the same number of protons‚ but different number of neutrons; they are different forms of a single element. Since we knew the isotopes had almost the same amount of sub-atomic particles‚ we made our hypothesis the following:
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My results are consistent with those‚ conducted by Dr. Antonini who used the same type of welding fume particles (MMAW: manual metal arc welding). However‚ welding fume doses at 10 mg/kg and 20 mg/kg in my experiment were twice and 4 times‚ respectively‚ the dose that was used in Dr. Antonini’s paper [6]. In blood‚ Dr. Antonini found a 1.5-fold increase in Mn levels‚ whereas in my experiment I found an 8-fold increase in blood Mn after the 20 mg/kg dose. Both results are consistent since the 20 mg/kg
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Magnesium is one of the twenty-four elements on earth that are essential for life. It is vital in human metabolism; and if our magnesium levels are too high or too low‚ we could suffer from sleep disturbances. Magnesium is a very common element found on earth that is used for a lot of everyday items. Much of what we have today would not be possible without magnesium. Magnesium was originally discovered by Sir Humphry Davy in 1808‚ but some are not sure if he officially isolated the element. It was
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Christopher Bisda BIO 101 Week 1 Individual Assignment 02/08/2010 The Process of Science a. Chapter 2: Question 11 How might you use a radioactive isotope to find out whether the oxygen in CO2 comes from sugar or oxygen gas? I would substitute with a radioactive isotope of oxygen and run the reaction. Upon observation of the result‚ the oxygen came from what was used if the carbon dioxide is radioactive. If the carbon dioxide is not radioactive‚ then it came from the sugar. b. Chapter
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