colorless‚ the end point in the titrations using potassium permanganate as the titrant can be taken as the first permanent pink color that appears in the solution. This titration involves the oxidation of Fe2+ ions to Fe3+ ions by the permanganate ion‚ and is carried out in sulfuric acid solution to prevent the air oxidation of the ferrous ion. The end point of the titration is sharpened markedly if phosphoric acid is present. The reason being the Fe3+ ion by itself has a yellow color that can partly mask
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DOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COM d – AND f – BLOCK ELEMENTS Electronic Configuration of Transition Metal/Ions The d-block element is called transition metal if it has partly filled d-orbitals in the ground state as well as in its oxidised state. The general electronic configuration of transition metal is (n–1) d1–10ns1–2. Exceptions in electronic configuration are due to (a) very little engery difference between (n–1) d and ns orbitals and (b) extra stability
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one of the examples that Jane Goodall used was after World War II‚ the city Nagasaki‚ one of the cities hit by the two atomic bombs‚ was left in rubble. "Scientists predicted that nothing would grow for decades. But‚ amazingly‚ two 500-year-old camphor trees survived. Only the lower halves of their trunks remained‚ and from those most of the branches had been torn off. Not a single leaf remained on the mutilated trees. "(The Book of Hope 7). But‚ soon later the truth began to sprout and today it
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RECRYSTALLIZATION Group Medical Technology Organic Chemistry Laboratory ABSTRACT Recrystallization is one of the simplest and most widely used technique for purifying organic solids through the differences in solubility at different temperatures. It is also the process in which the solid to be crystallized is dissolved to either a hot solvent or a hot solvent mixture and is cooled in a solution.In this experiment‚ acetanilide‚ the crude product of acetylation of aniline and acetic anhydride
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Oxidation-Reduction Worksheet For each reaction below‚ identify the atom oxidized‚ the atom reduced‚ the oxidizing agent‚ the reducing agent‚ the oxidation half reaction‚ the reduction half reaction‚ and then balance the equation by the method of oxidation-reduction showing all electrons transfers. 1.Mg + HCl ( MgCl2 + H2 2.Fe + V2O3 ( Fe2O3 + VO 3.KMnO4 + KNO2 + H2SO4 ( MnSO4 + H2O + KNO3 + K2SO4 4.K2Cr2O7 + SnCl2 + HCl ( CrCl3 + SnCl4 + KCl + H2O 5.KMnO4 + NaCl + H2SO4 ( Cl2 +
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force. Background Redox (reduction-oxidation) reactions include all chemical reactions in which atoms have their oxidation state changed. So‚ when a metal and a nonmetal react‚ there is an ionic bond formed‚ which means one of them loses electrons while the other gains them. Since this reaction involves the exchange of electrons it is termed as a redox reaction. The oxidation states in a metal- nonmetal are simple to determine because they are given oxidation states similar to their charges. However
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← Muon ← Is created when a neutrino collides and combines with an H2O proton (weak force) ← Creates blue light ← High energy; travels faster than the speed of light (in water) ← Neutrino ← Type of particle: Lepton (like electrons and muons) ← Most abundant particle in the universe ▪ 1016 neutrinos are passing through your body at any point in time ← Theoretically discovered by Wolfgang Pauli (1930); actually discovered in 1955 ← Produced during nuclear reaction or changes
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Laboratory exercise 3 : Quantitative analysis of vitamin C contained in a fruit juice Aim: To investigate the amount of vitamin C found in all kinds of fruit juice Introduction : Vitamin C is an antioxidant‚ along with vitamin E‚ beta-carotene‚ and many other plant-based nutrients. Antioxidants block some of the damage caused by free radicals‚ substances that damage DNA. The build-up of free radicals over time may contribute to the aging process and the development of health conditions such as
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of the oxidation number for iron nails. There are 2 different oxidation numbers for iron; that are 2 or 3. We will need to check each of the equations to find out the moles of each element in the equation. Then we can compare the ratio between the mole and the mass of iron and copper; that will be measured during the experiment. Finally because of the balanced equation the ratio of the mass and the mole has to be the same; by this we can check the actual equation and the actual oxidation number of
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Lab15 TITLE: Plan and Design OBSERVATION: Cooked vegetables have less Vitamin C (ascorbic acid) than uncooked vegetables. HYPOTHESIS: Heat speeds up the oxidation of vitamin C. AIM: To determine if heat speeds up the oxidation of vitamin C in broccoli APPARATUS AND MATERIALS: 2 broccolis‚ 1% dichlorophenolindophenol (DCIPIP)‚ an electric Masticating juicer‚ burette‚ water ‚ beakers‚ timer/ stopwatch‚ Bunsen burner‚ tripod‚ gauze‚ thermometer‚ 8 conical flasks‚ white tile‚ retort stand‚ funnel
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