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Creez si calculez…

Creez si calculez…. Numarul grupe………………… Numele si prenumele elevilor : Elev1…………………………… Elev2……………………………. Elev3…………………………... Elev4……………………………. SARCINA DE LUCU. Alegeti un fenomen chimic cunoscut de voi Scrieti corect ecuatia reactiei chimice.

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Creez si calculez…

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  1. Creez si calculez… Numarul grupe………………… Numele si prenumele elevilor : Elev1…………………………… Elev2……………………………. Elev3…………………………... Elev4……………………………

  2. SARCINA DE LUCU • Alegeti un fenomen chimic cunoscut de voi • Scrieti corect ecuatia reactiei chimice. • Calculati cantitatile de substante intrate si produse pe baza ecuatiei reactiei chimice. • Alcatuiti o problema de calcul de tip stoechiometric pe baza ecuatiei reactiei chimice. • Prezentati rezolvarea exercitiului.

  3. EXEMPLU DE REACTIE • Fenomenul ales:-stingerea varului. • Ecuatia reactiei chimice: CaO +H2O----> Ca(OH)2 1mol 1mol 1mol MCaO=40+16=56 MH2O=2x1+16=18 MCa(OH)2=40+2(16+1)=74 Enuntul exercitiului : Cate kg de lapte de var obtinem prin stingerea a 28 kg var nestins?

  4. Rezolvarea exercitiului • Datele problemei: • mCaO=28kg • mCa(OH)2= ? • 56kgCaO……………….74kgCa(OH)2 • 28kgCaO…………………..X X=28x74/56 X=74/2 X=37

  5. Interpretarea rezultatului • Masa varului stins obtinut prin stingerea a 28 kg CaO s-au obtinut 37kg Ca(OH)2

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