Find the number of grams of calcium chloride needed to prepare 500.0ml of a 4.0m solution

Does the energy in a solid increase or decrease when changing to a liquid?

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?