The answer is (4) synthesis. Synthesis reaction means that two or more reactants combine directly to one production. Substitution or single replacement means that one element of a compound is replaced by another element. Double replacement means that two ionic reactants exchange ions to form two new productions.
Answer:
b)5l x 10kg c)10kg + 9l (Not sure for the last 1)
Answer:
chemical symbol= Cl ( chlorine)
electrons= 17
2p electrons = 6
The ionic formula of sodium oxide would be Na20
