Based on the formula, predict whether each of the following compounds is primarily ionic or primarily covalent. a. sodium iodide (NaI)
d. ammonia (NH3)
b. methane (CH4)
e. glucose (C6H12O6)
c. calcium chloride (CaCl2)

Iknow the answer is a but i don't know why

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas