September 2021 0 6 Report
1.Выбери ряд веществ с ковалентной связью. Pb,CaO,O2
NaNO3,CaO,K2CO3
F2,HBr,H2O
Li2O,Mg,CO2
2.Укажи уравнения реакций замещения.
Может быть несколько вариантов ответа.
HCl+Zn=ZnCl2+H2↑
2KOH+FeSO4=Fe(OH)2+K2SO4
Fe2O3+3C=2Fe+3CO
2FeCl2+Cl2=2FeCl3
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