Balancing Chemical Equations

5. Hydrogen gas (H 2 ) and oxygen gas (O 2 ) react to form water (H 2 O)H 2 + O 2 H 2 O____ H 2 + ____O 2 ____H 2 O2H 2 + O 2 2H 2 O6. Sodium metal reacts with chlorine gas (Cl 2 ) to form sodium chloride.Na + Cl 2 Na +1 Cl -1Na + Cl 2 NaCl____Na + ____Cl 2 ____NaCl2Na + Cl 2 2NaCl7. Hydrogen chloride reacts with calcium hydroxide to form calcium chloride and hydrogen hydroxide.H +1 Cl -1 + Ca +2 OH -1 Ca +2 Cl -1 + H +1 OH -1HCl + Ca(OH) 2 CaCl 2 + HOH____HCl + ____Ca(OH) 2 ____CaCl 2 + ____HOH2HCl + Ca(OH)2 CaCl 2 + 2HOH8. Tin (IV) nitrite reacts with platinum (IV) [Pt +4 ] nitride to form tin (IV) nitride and platinum (IV) nitrite.Sn +4 NO 2-1+ Pt +4 N -3 Sn +4 N -3 + Pt +4 NO 2-1Sn(NO 2 ) 4 + Pt 3 N 4 Sn 3 N 4 + Pt(NO 2 ) 4____Sn(NO 2 ) 4 + ____Pt 3 N 4 ____Sn 3 N 4 + ____Pt(NO 2 ) 43Sn(NO 2 ) 4 + Pt 3 N 4 Sn 3 N 4 + 3Pt(NO 2 ) 49. Potassium chlorate reacts to form potassium chloride and oxygen gas (O 2 ).K +1 ClO 3-1 K +1 Cl -1 + O 2KClO 3 KCl + O 2____KClO 3 ____KCl + ____O 22KClO 3 2KCl + 3O 2