concentration and absorbance. We used nitric acid to dissolve a penny to produce another copper (II) nitrate to test its %Transmittance and plot that on the graph to discover the concentration of that substance which came out to be about .21M. We attempted to develop a method for determining the concentration of three different diluted copper (II) ion solutions. We also tried to determine the concentration of copper within a penny by dissolving it in nitric acid. We used a spectrometer to measure
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source of error is when the copper solution and water was heated so that the contents of the beaker would boil. The error in this step was caused by the variable heating of the solution to prevent bubbling of the solution. The reaction of copper with nitric acid resulted in a brown toxic gas‚ As the copper dissolved‚ the solution slowly turned blue because of the copper ions. this is the balanced equation for the reaction Cu(s) + 4H+(aq) + 2NO3-(aq)---> Cu2+(aq) +2NO2(g) + 2H2O(l) The reaction of aq
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Nerissa Govender 209539579 CHEM 310 Experiment 1- Synthesis of Co (acac)3 Date of experiment performed: 03 August 2011 Date of hand in: 10 August 2011 Aim To prepare cobalt (III) acetylacetonate in the laboratory using cobalt (II) carbonate and acetylacetone at room temperature and pressure. Introduction The anion acetylacetone (acac) used in this practical functions as a ligand which forms a complex with the cobalt metal cation in an octahedral array where there is electrostatic bonds
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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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Unit 1: Introduction to Biochemistry Lesson 1-4: Key Question How many electrons does Mg2+ have? (1 mark) Mg2+ has 10 electrons. A magnesium atom has 12 electrons with 2 of the 12 being valence electrons. Therefore the atom will lose the valence electrons which are located on the outermost shell to stabilize itself (outermost shell) as atoms tend to do what it easiest. Since magnesium lost 2 electrons it becomes positive as it is giving away electrons to stabilize other atoms. Hence magnesium
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The element‚ magnesium is unlike most because of the way it is composed‚ and many do not know what Magnesium is. The element has unique physical properties‚ a rich history that stretches back to the 17th century‚ and lots of sophisticated uses that are used in your everyday life‚ and vital to your health as a human. Magnesium’s properties are‚ in a way‚ very unique. On the periodic table Magnesium is found in the Alkaline Earth metal group. The structure of the atom consists of twelve protons‚
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