Consider the words or phrases below and drop them in the bucket that you would most associate with the word or phrase in the thermodynamic context. In cases where you think they could go in two buckets, consider (even write down) what conditions are necessary for each condition. Thermo is all about the conditions... Group the following words into
1. non equilibrium,
2 equilibrium phase cahnge, and
3. equilibrium reaction.
Heat of vaporization
saturated solution
mass movement
unsaturated solution
condensation
heat of fusion
vapor pressure
normal boiling poin
Ksp
solubility
Ka

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.