The Lewis dot model of a molecule is shown. A visual diagram of a PCl3 molecule is shown. Phosphorous is the central atom with a horizontal line connecting to each of the three Chlorine atoms around it. Phosphorous has a pair of dots on it. Each of the three chlorine atoms have a pair of three dots on it.

Based on the model, which of the following is true?

The electronegativity difference between phosphorous and chlorine is greater than 1.7.
Each chlorine has three non-bonded pairs and one bonded pair of electrons.
Phosphorous has three non-bonded pairs and one bonded pair of electrons.
Phosphorous has three valence electrons in the outermost energy level.

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. 

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged