BAREM_OJCh_clasa_9_21_februarie_2015.pdf
Transcript of BAREM_OJCh_clasa_9_21_februarie_2015.pdf
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DIRECIA GENERAL
NVMNT PREUNIVERSITAR
OLIMPIADA DE CHIMIE etapa judeean
21 februarie 2015
BAREM DE EVALUARE - Clasa a IX-a
Subiectul I..............................................................................................................................................20 puncte
A. ......................................................................................................................................8 puncte (2x4puncte)
a). Si4+
< Cl < Si < K+ < Cl
- < Ar < K
b). 5, 15, 24.
c). Ar > O > Cl > Si > Ca > Na > K
d) 142 g
B. ......................................................................................................................................12 puncte(3x4puncte)
a). 62,5 g sol H2SO4 49%
b). 30 g sol H2SO4 49%
c). 104,136 g sol H2SO4 49%
Subiectul II............................................................................................................................................25 puncte
a). Identificarea substanelor i scrierea ecuaiilor reaciilor chimice din schem....................15 p uncte
a- KClO3, b KCl, c-O2, d-HCl, e-Cl2, f-H2O, g-HOCl, h-NH3, i-NH4Cl, j-Cu(NO3)2, k-NH4NO3,
l-CuCl2, m-KOH, n-Cu(OH)2, o-[Cu(NH3)4](OH)2
b). Formarea legturilor ...................................................................................................... .........5 puncte
c) Aranjarea corect a moleculelor stabile i justificarea rspunsului ....................... .................5 puncte
O2 < HCl < Cl2 < NH3