Химия помогите срочно!Нужно закончить уравнения реакций и расставить коэффициенты.
1)SiO2+BaCO3=
2)Si+Ca=
3)SiO2+KOH=
4)Na2SiO3+H2SO4=
5)Si+O2=
6)H2SiO3+KOH=
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