Chemistry, 04.05.2021 02:20, wendymtz2004

Rezolvati urmatoarele exercitii si probleme: 1. Alege varianta corectă: concentrația unei soluții (c =

md

ms

∙ 100), obținute prin dizolvarea a 40

g sare în 360 g apa este: a) 20 %,

b) 18 %,

c) 10 %.

2. Se amestecă 500 g soluție de saramură 20% cu 300 g soluție de saramură 50% și cu 200 g apă.

Să se calculeze concentrația soluției finale.

3. Alege, folosindu-te de SP, metalele si nemetalele din sirul de elemente: Hg, Cl, B, Ca, Na, Fe,

As, Fr, O, Mg

4. Aflati elementul chimic, stiind ca se afla in gr. IVA si perioada 3.

Answers: 1

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Rezolvati urmatoarele exercitii si probleme: 1. Alege varianta corectă: concentrația unei soluții...