http___livro-ensino-medio.f1cf.com.br_quimica_hr_chemistry-146.html_1.xml
1.1 2.1 3.1 4.1 5.1 6.1 8.1 9.1 10.1 11.1 12.1 13.1 14.1 15.1 16.1 17.1 18.1 19.1 20.1 21.1 22.1 23.1 24.1 25.1 26.1 27.1 28.1 29.1 30.1
Chemistry Sweat has almost no smell, it only leads to fame by bacteria in the armpits. These bacteria produce acidic substances responsible for the bad smell. By eliminating the bacteria, we inhibited the stench. This is the function of deodorant, or remove moisture from the skin and neutralize the smell of the acids formed by bacteria. So, have you figured out how to protect the hardest part of your body? Well .. Some tracks you already did it. Continue for sure you will find out. Do you know how to use the toiletries in the correct way? Or will need to know a little more chemistry? After all, what's this chemical equilibrium? And what he has to do with the hardest part of your body? ACTIVITY To help you understand the chemical balance, perform the following experiment: Place in a test tube and add 5 ml of water about two drops of iodine solution (tincture of iodine you find in pharmacies). Add two drops of starch solution (the one used in cooking starch, dissolved in water). Shake. Note the color. Heat the test tube for a few minutes. What happened? Let cool and watch the tube again. What happened? (You can repeat the process several times to warm-cool). You know what it is to be reversible? In the Concise Oxford English dictionary you will find the term reversible as capable of reversing the operation; able to regenerate, it can return to its previous state or held in reverse. Many chemical reactions are reversible, that is, they occur simultaneously in opposite directions. Then, the reversible reaction is one in which the reactants are transformed in products. And the products as they are formed, regenerate the starting material.
1.1 2.1 3.1 4.1 5.1 6.1 9.1 10.1 11.1 12.1 13.1 14.1 15.1 16.1 17.1 18.1 19.1 20.1 21.1 22.1 23.1 24.1 25.1 26.1 27.1 28.1 29.1 30.1
Kemija Znoj je gotovo bez mirisa, to samo dovodi do slave bakterije u pazuhu. Ove bakterije stvaraju kisele tvari koje su odgovorne za neugodne mirise. Po uklanjanju bakterija, što inhibira smrad. Ova je funkcija dezodorans, ili ukloniti vlagu iz kože i neutralizirati miris stvorene kiseline od strane bakterija. Dakle, jeste li shvatili kako bi zaštitili najteži dio svog tijela? Neki prati već je to učinio. Nastavak sigurno ćete saznati. Znate li kako se koriste toaletne na ispravan način? Ili će znati malo više kemije? Uostalom, što je to kemijska ravnoteža? I ono što mora učiniti s najteži dio svog tijela? AKTIVNOST Da bi vam pomoći razumjeti kemijsku ravnotežu, izvedite sljedeći eksperiment: Mjesto u epruvetu i dodajte 5 ml vode oko dvije kapi otopinom joda (tinktura joda možete pronaći u ljekarnama). Dodajte dvije kapi otopine škroba (jedna se koristi u kuhanju škroba, otopljen u vodi). Shake. Napomena boju. Zagrijte cijev test za nekoliko minuta. Što se dogodilo? Neka se ohladi i gledati cijev ponovno. Što se dogodilo? (Možete ponoviti postupak nekoliko puta na toplo-hladno). Znate li što to znači biti reverzibilan? U Kratki Oxford English rječniku naći ćete termina reverzibilna kao sposobna za rad unazad, mogu regenerirati, to može vratiti u prijašnje stanje ili održati u obrnutom smjeru. Mnoge kemijske reakcije su reverzibilni, to jest, oni se javljaju istovremeno u suprotnim smjerovima. Zatim, reverzibilne reakcije je ona u kojoj su reaktanti su pretvoreni u proizvodima. I proizvodi kao što su oni nastali, regenerirati početnog materijala.