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ACTIVITY Let's ride the silver mirror, and for that we will need: glucose solution of silver nitrate 0.1 mol / L, ammonia, test tube, lamp, wooden tweezers and dropper. Place in a test tube, a teaspoon of glucose and add 10 ml of silver nitrate solution (Tollens reactive). Then add to this system 10 drops of ammonia. Attach the hose with the clamp wood and heat it in the lamp under constant agitation. During heating, do not let the mouth of the test tube is facing towards you or others. The heating should be done by the time you realize the formation of a mirror on the walls of the tube. What is the chemical reaction that occurs in the formation of the mirror? From the oxidation of ethanol, we also obtain a carboxylic acid. The RC OH CH OH + K Cr SO COOH + 2 Cr SO Acetic acid, also called acetic acid is a colorless liquid with a sharp odor, which solidifies at +16.7 ° C and boils at +118.1 ° C. When cooled below ° C, pure ethanoic acid solidifies forming shiny crystals, colorless and transparent, with the appearance of ice, hence is called glacial acetic acid. From the burning of fossil fuels, burning of vegetation and burning of organic matter, there is formation of some carboxylic acids, as methanoic acid, formic acid and others. Recent studies have shown the effect of acetic and formic acids in the atmospheric corrosion of metals. Source: http://www.sxc.hu
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AKTIVNOST Idemo vožnja srebro ogledalo, a za to ćemo morati: glukoze otopine srebrnog nitrata 0,1 mol / L, amonijaka, epruveta, lampa, pinceta i drveni kapaljka. Mjesto u epruveti, žličicu glukoze i dodati 10 ml otopine srebrnog nitrata (Tollens reaktivni). Zatim dodati na ovaj sustav 10 kapi amonijaka. Pričvrstite cijev s kvačicom i drva i to zagrijati u lampu pod stalnim agitaciju. Tijekom grijanja, ne dopustite usta epruvetu se okrenuti prema vama ili drugima. Grijanje treba biti učinjeno u vrijeme kada shvatite formiranje zrcalo na zidovima cijevi. Što je kemijska reakcija koja se javlja u formiranju ogledalu? Uslijed oksidacije etanola, također dobiti karboksilna kiselina. RC OH CH OH + K Cr SO COOH + 2 Cr SO Octena kiselina, koji se nazivaju i octene kiseline je bezbojna tekućina s oštrim mirisom, koji učvršćuje 16,7 na C i čirevi, na 118,1 C Kada se ohladi u nastavku C, čista ethanoic kiseline učvršćuje formiranju sjajne kristale, bezbojna i prozirna, s pojavom leda, stoga se zove ledena octena kiselina. Od izgaranje fosilnih goriva, paljenje vegetacije i spaljivanje organske tvari, tu je formiranje neke karboksilnih kiselina, kao methanoic kiselina, mravlja kiselina i drugi. Nedavne studije su pokazale učinak octene i mravlje kiseline na atmosferske korozije metala. Izvor: http://www.sxc.hu