1) 2Sr + 6HNO3 = 2Sr(NO3)2 + 3H2O + NOОВР: Sr -2, N +5, O -2
2) Sr + 4HNO3 = Sr(NO3)2 + 2H2O + 2NO2ОВР: Sr -2, N +5, O -2
3) Sr + H2SO4 = SrSO4 + H2ОВР: Sr +2, S +6, O -2, H +1
4) Sr + 2KOH = Sr(OH)2 + H2ОВР: Sr +2, O -2, H +1, K +1
5) 2Cr + 6HNO3 = 2Cr(NO3)3 + 3H2OОВР: Cr +6, N +5, O -2
6) Cr + 4HNO3 = Cr(NO3)4 + H2O + NO2ОВР: Cr +4, N +5, O -2
7) Cr + H2SO4 = Cr2(SO4)3 + H2OОВР: Cr +3, Sulfur +6, O -2, H +1
8) Cr + 2KOH = K2CrO4 + H2OОВР: Cr +6, K +1, O -2, H +1
1) 2Sr + 6HNO3 = 2Sr(NO3)2 + 3H2O + NO
ОВР: Sr -2, N +5, O -2
2) Sr + 4HNO3 = Sr(NO3)2 + 2H2O + 2NO2
ОВР: Sr -2, N +5, O -2
3) Sr + H2SO4 = SrSO4 + H2
ОВР: Sr +2, S +6, O -2, H +1
4) Sr + 2KOH = Sr(OH)2 + H2
ОВР: Sr +2, O -2, H +1, K +1
5) 2Cr + 6HNO3 = 2Cr(NO3)3 + 3H2O
ОВР: Cr +6, N +5, O -2
6) Cr + 4HNO3 = Cr(NO3)4 + H2O + NO2
ОВР: Cr +4, N +5, O -2
7) Cr + H2SO4 = Cr2(SO4)3 + H2O
ОВР: Cr +3, Sulfur +6, O -2, H +1
8) Cr + 2KOH = K2CrO4 + H2O
ОВР: Cr +6, K +1, O -2, H +1