If the pressure exerted by a gas at 100°C in a volume of 8.04 L is 3.81 atm, how many moles of gas are present

Which substances have the lowest melting points: ionic covalent, or metallic

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need