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H2SO4 + 2NaOH ----------> Na2SO4 + H20 wymiany podwójnej
4Al + 302 ------------> 2Al203 synteza
2Ag20 -------------> 4Ag + 02 rozkład
zad 2
3Cl2 + 2Cr ---------> 2CrCl3 synteza
4Cu + 02 -------> 2Cu20 synteza
4Br + 502 -------------> 2Br205 synteza
2Ba + 02 ---------> 2Ba0 synteza
3H2 + N2 ---> 2NH3 synteza