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Chemistry Have you noticed the changes that occur when dealing with water changes physical state of pure substances? The ice, which is water in the solid state at a temperature below zero, has a melting point of 0 ° C when subjected to a pressure of 1 atm. As soon as the temperature begins to climb and reaches 0 ° C, ice begins to change phase and continues at 0 ° C until completely melted, turning into liquid water at 0 ° C. If we keep the pressure of 1 atm and increase the temperature, the water will remain liquid until reaching 100 ° C, boiling temperature call. After the 100th C, the liquid water passes through another phase change, thus achieving gas phase (steam). But for the mixtures, the process of phase shifting is slightly different: the mixtures do not show common melting and boiling points defined vary. Which occurs usually find problems when we need to separate a mixture. An example quite normal in our day-to-day is when we choose rice, beans or even washing a vegetable, in which case we use a method of separating mixtures called scavenging, where, with his own hands, we can remove the "droppings "that comes along with the food. Other methods for separating heterogeneous mixtures, such as ventilation, levigating, flotation, fractional dissolution, the sieving or screening, magnetic separation, filtration joint, filtration under vacuum, decantation, siphoning, centrifugation, decanting funnel and bromine. And when we have one case where it does not make sense to which substances are mixed? You are homogeneous mixtures of those cases that we discussed earlier! What should we do to able to separate the components of these mixtures? In that case water and salt may use a method called simple distillation, which is used when we have a solid component, and another liquid to form a mixture. It consists in heating the mixture in suitable apparatus, and the liquid then evaporates and condenses and is collected in another container and the solid is unchanged. Thus, it can be stated that the desalinated water has the same taste of drinking water. Now all drinking water have the same taste? And distilled water can be consumed?
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Kemija Jeste li primijetili promjene koje se događaju kada se bave promjene vode fizičko stanje čiste tvari? Leda, što je voda u krutom stanju na temperaturi ispod nule, ima točku tališta od 0 ° C kada je podvrgnuta tlaku od 1 atm. Čim temperatura počinje uspon i spusti na 0 ° C, led se počinje mijenjati fazu, a nastavlja se na 0 ° C dok se potpuno otopi, pretvara u tekuće vode na 0 ° C. Ako ćemo zadržati pritisak 1 reagirala i povećanje temperature, voda će ostati dok se ne postigne tekućine 100 ° C, temperatura vrenja poziva. Nakon 100. C, tekuća voda prolazi kroz drugu promjenu faze, čime se postiže plina fazu (parni). No, za smjese, proces MREĆNI je malo drugačija: smjese ne pokazuju zajedničku topi i vrelišta definiran varirati. Koja javlja se obično nalaze probleme kada moramo odvojiti smjesu. Primjer sasvim normalno u našem dana u dan je kada biramo rižu, grah ili čak pranje povrće, u kojem slučaju ćemo koristiti metodu separaciju smjese pod nazivom hvatača, gdje je, sa svojim vlastitim rukama, možemo vaditi "izmet "koji dolazi zajedno s hranom. Druge metode za odvajanje heterogene smjese, poput ventilacije, levigating, plovnost, djelomični oslobađanja, prosijavanje i screening, magnetska separacija, filtracija zajednički, pod vakuum filtraciju, pretakanje, istakanje, centrifugiranje, pretakanje dimnjak i broma. A kad imamo jedan slučaj gdje je nema smisla na koje tvari su pomiješana? Ti su homogene smjese tih slučajeva koje smo ranije objašnjeno! Što bismo trebali učiniti kako bi mogli odvojiti dijelove tih smjesa? U tom slučaju vode i soli može koristiti metodu nazvanu jednostavno destilaciju, koji se koristi kada imamo čvrstu komponentu, i još tekućine da se formira smjesu. On se sastoji u zagrijavanjem smjese u odgovarajućem aparata i tekućinu onda isparava i zgušnjava i sakuplja se u drugu posudu i čvrsto je nepromijenjen. Dakle, može se reći da je desalinated voda ima isti okus pitke vode. Sada se vodom za piće imaju isti okus? A destilirana voda može se konzumirati?