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Допиши уравнения химических реакций.

1. \(\mathrm{CaO + H\_2O} = \) [ ].
2. [ ] \( + \) [2|3|4] \(\mathrm{H\_2O} = \) [2|3|4] \(\mathrm{H\_3PO\_4}\) .
3. [2|3|4] \(\mathrm{K}\) \( + \) [ ] \( = \) [2|3|4] \(\mathrm{KOH + H\_2} \uarr\) .
4. \(\mathrm{Zn} + \mathrm{H\_2O} \xrightarrow{t} \) [ ] \( + \) \(\mathrm{H\_2} \uarr\) .
5. \(\mathrm{C}\) \( + \) \(\mathrm{H\_2O = CO + H\_2} \uarr\) .
6. \(\mathrm{H\_2O}\) \( + \) [ ] \( = \) [2|3|4] \(\mathrm{NaOH}\) .
7. \(\mathrm{SO\_3}\) \( + \) [ ] \( = \mathrm{H\_2SO\_4}\) .
8. [2|3|4] \(\mathrm{H\_2O} \xrightarrow{эл. ток} \) [ ] \( + \) [ ].