2Na + H2O ==> Na2O + H2 2Na + O2 ==> Na2O Na + HCl ==> NaCl + H2 Na + Ca2 ==> No reaction! Solution 2Na + H2O ==> Na2O + H2 2Na + O2 ==> Na2O Na + HCl ==> NaCl + H2 Na + Ca2 ==> No reaction!.Read less