Please help with this

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt