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ACTIVITY Using materials: two effervescent tablets, two glasses of water at room temperature, a saucer and a bat, we perform the experiment: With cane crush one tablet on the saucer. Place the same amount of water in each glass. Add the two tablets, one for each cup at the same time. In situations where the tablet dissolves faster? Why? Some substances may react chemically in the presence of light. An example of our day-to-day: chlorophyllous plants, transform carbon dioxide (CO ) and water into carbohydrates (C The ) and oxygen (O Speaking of drugs, are usually sold in dark bottles to not suffer decomposition by light. Photo: Icon Audiovisual ACTIVITY To better understand the speed of chemical reactions and the factors that influence, we manufacture the fresh cheese. We need material: milk, bowl, curd, coffee spoon, thermometer, salt, margarine pot holed sieve. Heat the milk (fresh or Type C - do not boil) at 35 ° C; Add 1 teaspoon of rennet (found in market) for each liter of milk; Shake well to obtain good homogenization of the mixture; Allow to stand for 50 to 60 minutes for coagulation of casein (maintain temperature); The cutting of the curd in the horizontal and vertical; After separation of the serum and clot put in a colander to drain the whey, put a pinch of salt; Place the clot in a way stuck and pressing with a spoon;
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AKTIVNOST Korištenje materijala: dvije šumeće tablete, dvije čaše vode na sobnoj temperaturi, tanjur i palicom, možemo izvesti eksperiment: S trske slomili jednu tabletu na tanjurić. Postavite istu količinu vode u svaku čašu. Dodati dvije tablete, po jedan za svaku šalicu u isto vrijeme. U situacijama u kojima se tableta rastvara brže? Zašto? Neke tvari koje se mogu kemijski reagiraju u prisutnosti svjetlosti. Primjer naše dan-to-day: chlorophyllous biljke, pretvoriti ugljični dioksid (CO ) i vodu u ugljikohidrate (C ) i kisika (O Govoreći o drogama, obično se prodaju u tamnim bočicama da se ne pate raspadanje svjetlom. Foto: Icon audiovizualnu politiku AKTIVNOST Da bi bolje razumjeli brzinu kemijskih reakcija i čimbenike koji utječu, proizvodimo i svježi sir. Trebamo materijal: mlijeko, zdjela, skuta, kava žlica, termometar, sol, margarin pot skriva sito. Zagrijte mlijeko (svježe ili tip C - ne kuhati) na 35 ° C; Dodajte 1 žličicu sirila (naći na tržištu) za svaku litru mlijeka; Dobro protresti kako bi se postigla dobra homogenizacije smjese; Ostavite da odstoji 50 do 60 minuta za koagulacije kazeina (održavanje temperature); Rezanje gruša u horizontalne i vertikalne; Nakon odvajanja od seruma i ugrušak staviti u cjedilo za odvod sirutke, staviti prstohvat soli; Stavite ugrušak na način zaglavi i pritiskom sa žlicom;