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2HCl + 2K --> 2KCl + H2
2HCl + Ca --> CaCl2 + H2
b)tlenem
O2 + 4K -->2K2O
O2 + 2Ca -->2CaO
c)wodą
2H2O + Ca --> Ca(OH)2 + H2
H2O + K--> KOH + 1.5H2
4K + O2 ----> 2K2O
2K + 2H2O ---> 2KOH + H2 (strzałka)
Ca + 2HCl ---> CaCl2 + H2 (strzałka)
2Ca + O2 ----> 2CaO
Ca + 2H2O ----> Ca(OH)2 + H2 (strzałka)