Ой, ну это легко)
2K + H2SO3 = K2SO3 + H2
3Ba + 2H3PO4 = Ba3(PO4)2 + 3H2
2Al + 6HBr = 2AlBr3 + 3H2
Кипение воды, плавление льда, измельчение сахара в пудру - физические явления
<span>CuSO</span>4<span> + 2NaOH = Cu(OH)</span>2<span> + Na</span>2<span>SO</span>4
<span>2Na</span>3<span>PO</span>4<span> + 3CaCl</span>2<span> = Ca</span>3<span>(PO</span>4<span>)</span>2 <span>↓ + 6NaCl
<span>Al</span>2<span>(SO</span>4<span>)</span>3<span> + 3Ba(NO</span>3<span>)</span>2<span> = 3BaSO</span>4 <span>↓ </span><span>+ 2Al(NO</span>3<span>)</span>3
<span>H</span>2<span>SO</span>4<span>(конц.) + Na</span>2<span>SO</span>4<span> = 2NaHSO</span>4
<span>H</span>2<span>SO</span>4<span>(разб., гор.) + Na</span>2<span>CO</span>3<span> = Na</span>2<span>SO</span>4<span> + CO</span>2<span>↑ + H</span>2<span>O</span>
<span>2NaOH+CuSO4=Cu(OH)2+Na2SO4</span>
<span>Cu(OH)2+H2SO4=CuSO4</span> + 2H2O</span>