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To perform a graphical interpretation we get a situation where it covers chemical concepts. We know that we and other living things depend on water to survive. Until we get a few weeks without food, but without water we can not resist for long. We need her to clean our homes, washing, irrigating crops, dissolved chemicals, power generation, etc.. Water keeps the activities of our body and, often, we take solutions. In chemical solutions are homogeneous mixtures of two or more substances, or are completely dissolved each other. For example, the homogenous mixture is a syrup of sugar and water. The sugar molecules are dispersed and mixed thoroughly with the water, so that they can not be seen discrete particles or regions (Atkins, p. 80th). But often, when we prepare a sweetened beverage like a juice, it may be that by adding a certain amount of sugar, a party does not dissolve, getting settled at the bottom of the cup. Why does this happen? By adding 20 g of glucose (C - sugar - in 100ml of water (H O) at room temperature, all glucose dissolves. However, increasing the amount of glucose to 200g at the same temperature, the glucose remains undissolved (Fig. 1). As the amount of water is predominant, say water is the solvent, and the glucose lesser extent, the solute. Solubility of sugar in water Figure 1
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Za obavljanje grafičko tumačenje smo dobili situaciju u kojoj se pokriva kemijske koncepte. Mi znamo da smo i drugih živih bića ovise o vodi za opstanak. Dok smo dobili nekoliko tjedana bez hrane, ali bez vode ne možemo oduprijeti dugo. Moramo ju očistiti naše domove, pranje, navodnjavanje usjeva, otopljeni kemikalija, energije, itd.. Voda čuva aktivnosti našeg tijela i, često, uzmemo rješenja. U kemijskim rješenja su homogene smjese dviju ili više tvari, ili se otope u potpunosti jedni s drugima. Na primjer, homogena smjesa je sirup od šećera i vode. Kao šećer molekule raspršili i temeljito miješati s vodom, tako da se ne može vidjeti diskretna čestice ili regije (Atkins, str. 80.). No, često se, kad smo pripremiti zaslađeno piće poput soka, može biti da je dodavanjem određenu količinu šećera, stranka ne raspusti, uzimajući naselili na dnu čaše. Zašto se to dogodilo? Dodavanjem 20 g glukoze (C - šećer - u 100 ml vode (H O) na sobnoj temperaturi, sve glukoze otapa. Međutim, povećavajući količinu glukoze u 200g na istoj temperaturi, glukoza ostaje šupljine (slika 1). Kao što je količina vode je dominantna, kažu voda je otapala i glukoze manjoj mjeri, lutni. Topljivost šećera u vodi Slika 1