Modified Winkler method for dissolved oxygen determination Abstract In this study the group has determined the presence of oxygen in sample through a modified winkler method. The amount of oxygen is determined through a series of reaction. A body of water can sustain life if dissolved oxygen is sufficed. Depletions in dissolved oxygen can cause major shifts in the kinds of aquatic organisms found in water bodies. Introduction The amount of dissolved oxygen present in water or wastewater
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ground level are the result of the rapid release of energy into the air‚ causing the air to expand faster than the speed of sound. This produces a shock wave‚ a sonic boom. The colors are produced by heating metal salts‚ such as calcium chloride or sodium nitrate‚ that emit characteristic colors. The atoms of each element absorb energy and release it as light of specific colors. The energy absorbed by an atom rearranges its electrons from their lowest-energy state‚ called the ground state‚ up to a
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|33 |[Ar]3d104s24p3 | |Sb |51 |[Kr]4d105s25p3 | |Bi |83 |[Xe]4f 145d106s26p3 | General introduction‚ electronic configuration‚ occurrence‚ oxidation states‚ trends in physical and chemical properties; nitrogen - preparation‚ properties and uses; compounds of nitrogen: preparation and properties of ammonia and nitric acid‚ oxides of nitrogen (structure only); Phosphorous-allotropic forms; compounds
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different inhibitors that inhibit the rate of Enzymatic Browning in different fruits and vegetable. REQUIREMENTS: ➢ Citric Acid (1% solution) ➢ Acetic Acid (1% solution) ➢ Ascorbic Acid (1% solution) ➢ Sugar (1%.Solution) ➢ Sodium chloride (1% solution) ➢ Sulfite salt (1% solution) ➢ Samples (Potato‚ Banana‚ Apple) Enzymatic Browning: Enzymatic browning (oxidative) is a reaction between oxygen and a phenolic substrate catalyzed by polyphenol oxidase result in
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Active transport: requires that a cell expend energy to move molecules across a membrane against the solute’s concentration gradient (the side where it is more concentrated) Feedback inhibition: Metabolic reaction is blocked by its products. A product acts as an inhibitor of one of the enzymes in the pathway to regulate metabolism. Centriole: a structure in an animal cell composed of microtubule triplets arranged in a 9+0 pattern. An animal usually has a pair of centrioles within each of its centrosomes
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TiO2 nanoparticles are made as they show good photocatalytic activity in degradation of dyes into harmless products. Synthesis is done using titanium butoxide and 2-propanol. The particles formed were a little larger than 100 nm but after adding sodium lauryl sulphate as surfactant‚ the correct sized nanoparticles were formed. These nanoparticle which are TiO2 (Degussa‚ Aeroxide P25‚ 90% anatase) were used in degradation of dye using batch reactor in which glass cylinder was inserted with UV light
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electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains magnesium ions(Mg2+)‚ iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode. Write the equation
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INDUSTRIAL REVOLUTION Introduction and Meaning Emergence and Cause Countries involved and spread of knowledge Impact a) Urbanisation b) Capitalism c) Socialism Inventions a) Revolution in cotton and textile industry b) Revolution in metallurgy c) Steam power d) Mining e) Glass making copy headings f) Paper machine in project g) Chemicals h)
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this lab we measured the rate a balanced oxidation/reduction reaction between iodine‚ hydrogen‚ and bromate ion occurs. The above reaction occurs slowly so we used a coupled iodine clock reaction to measure the rate of the oxidation/reduction reaction because it occurs much faster but is still dependent upon the other reaction. To accomplish this‚ two mixtures were prepared in separate Erlenmeyer flasks. In the 250 ml flask .010M potassium iodide‚ .0010M Sodium thiosulfate and distilled water was prepared
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Reaction-Electrolysis of Water Introduction: Demonstrate the decomposition of water in simple but very colorful and dramatic fashion on an overhead projector. Concepts: • Decomposition reaction • Oxidation–reduction • Electrolysis • pH Materials: Sodium Chloride/universal indicator solution‚ NaCl‚ 25 mL Overhead projector Pencil lead‚ 0.7 mm Battery lead with alligator clips Petri dish‚ disposable Battery‚ 9-Volt Graduated cylinder‚ 25- mL Safety
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