Which of the following is a synthesis reaction? 2Na + 2H 2O 2NaOH + H 2 2S + 3O 2 2SO 3 2H 2O 2 2H 2O + O 2 CaCl 2 + F 2 CaF 2 + Cl 2

2S + 3O 2 - -->2SO 3 synthesis

Explanation:

2Na + 2H 2O - ->2NaOH + H 2 single replacement

2S + 3O 2 - -->2SO 3 synthesis

2H 2O 2 - -->2H 2O + O 2 decomposition

CaCl 2 + F 2 - --> CaF 2 + Cl 2 single replacement