Experiment 6 Preparation and reactions of boric acid Objectives: To prepare boric acid from sodium tetraborate (borax) To carry out tests on the prepared sample of boric acid To study the physical and chemical properties of boric acid Introduction: Boron is an element in the p-block of the periodic table. It has the electron configuration of 1s22s22p1 and is in group 3 or goup 13 (IUPAC classification). In nature‚ it consists of two isotopes 10B (19.6%) and 11B (80.4%). Boron is bonded
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the experiment * Aim: To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent. Equipment: * 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper‚ zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders Steps: A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with sandpaper
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Post-Structuralism Post-structuralism is a continuation and simultaneous rejection of structuralism – not only literary structuralism but even more so the anthropological structuralism of Levi-Strauss (Bertens‚ 2008: 93). * Post-structuralist thought has discovered the essentially unstable nature of signification. The sign is not so much a unit with two sides as a momentary ‘fix’ between two moving layers. Saussure had recognized that signifier and signified are two separate systems‚ but he
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Darren Schai 11717509 The practices in leadership have changed in the post-bureaucratic era. Leadership is at the forefront to success of any organizational model‚ and twentieth-century research has clearly examined its role in the managing of individuals both in the bureaucratic and post-bureaucratic eras. The turn of the millennium also brought about with it a shift in the nature of the workplace‚ now regarded as a dynamic‚ ever changing and self-motivating avenue where leadership practices
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description on acid rain as well as a focus on acid rain in eastern Canada. This report contains a very helpful basic background on acid rain as well as a questionnaire. It involves an annual report on the Federal-Provincial Agreements‚ sulphur dioxide emissions in the seven most eastern provinces‚ trends in acid deposition in the Atlantic provinces from 1980-1994‚ as well as acid precipitation in Kejimkujik‚ Nova Scotia. It also includes data tables‚ graphs and interesting facts concerning acid rain.
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2011 Lab report on separation of mixtures Purpose- The purpose of this lab is to separate or isolate the desired product from large amounts of solvent and by-products. It is also followed by a purification step that removes trace amounts of other substances from the final product. One of the experimental techniques that we used in the lab to separate or purify mixture is fractional crystallization. In the experiment we used fractional crystallization to resolve a mixture of salicylic acid and CUSO₄
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April Goodson CHEM 242L-002 February 20‚ 2013 Oxidation of Cyclohexanone to Adipic Acid Abstract The cyclic ketone cyclohexanone was oxidized to adipic acid using the oxidizing agent nitric acid. The experiment yielded 0.2667 grams of adipic acid‚ giving a percent yield of 113.97%. Although the product was allowed to dry for one week‚ residual moisture was still present in the sample and a melting point could not be obtained. This error in the experiment either resulted from adding too much
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What Causes Acid Rain? {2} {2} Acid rain caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into air. These substances can rise very high into the atmosphere‚ where they mix and react with water‚ oxygen‚ and other chemicals to form more acidic pollutants‚ known as acid rain.{2} Sulfur dioxide and nitrogen oxides dissolve very easily in water and can be carried very far by wind. As a result‚ the two compounds can travel long distances where
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Congress‚ and the states from enacting ex post facto laws (Brody & Acker‚ 2010). That is‚ laws cannot be passed‚ making an action illegal‚ and then be used to prosecute a person who had committed that act prior to the passage of the law. At the same time‚ laws that are changed‚ in such a manner as to increase the punishment for violations‚ cannot be applied to persons who have been previously convicted for violating that law. It is this meaning of ex post facto laws‚ which directly affects the criminal
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Post Partum Depression Most women expect to feel elated after their child is born. Nine months of anticipation are coming to an end. Relatives and friends have all provided their support and words of encouragement to help you pass the time of carrying the child more pleasurable and easier. Who would have thought that there is now another obstacle to overcome? But the question would remain to most new mothers what this new task would be. And the answer would quickly become visible. Post Partum Depression
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