Предмет: Химия, автор: Parick

Cl2,CaI2,MgH2,B,Pb,HBr какие из этих веществ с ковалентно полярным типом хим.свизи?

Ответы

Автор ответа: АЙГЕРИМКА
0

Cт,ок, которые изменились

Na2S(+4)O3+K2Cr(+6)2O7+H2SO4=Na2S(+6)O4+Cr(+3)2(SO4)3+K2SO4+H2O

S(+4)-2e=S(+6)             2      в-ль, ок-е

2Cr(+6)+2*3e=2Cr(+3)   6      ок-ль, в-е

3Na2SO3+K2Cr2O7+4H2SO4=3Na2SO4+Cr2(SO4)3+K2SO4+4H2O

 

Автор ответа: УченицаДевятого
0

Cl2,CaI2,MgH2

Почему именно так надо объяснять?

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