Question

Химия. 8 класс. Помогите, пожалуйста

Answer 1

1) 2H₃PO₄+3Mg=Mg₃(PO₄)₂↓+3H₂
2) 2NaOH+Ca(NO₃)₂=Ca(OH)₂↓+2NaNO₃
2Na⁺+2OH⁻+Ca²⁺+2NO₃⁻=Ca(OH)₂↓+2Na⁺+NO₃⁻
2OH⁻+Ca²⁺=Ca(OH)₂↓
3) SO₂+Ca(OH)₂=CaSO₃↓+H₂O

Answer 2

1) $2H_{3}PO_{4}+3Mg=Mg_{3}(PO_{4})_{2}+3H_{2}$ ↑
2) $2NaOH+Ca(NO_{3})_{2}=Ca(OH)_{2}+2NaNO_{3}$
3) $SO_{2}+Ca(OH)_{2}=CaSO_{3}+H_{2}O$