The density of solid lead (Pb) at room temperature is 11.35 g/cm3, while the density of liquid lead at its melting point of 327°C is 10.68 g/cm². Why is the density of the liquid lead slightly lower?
A The liquid lead atoms are less likely to move in a given amount of space than the solid lead atoms.
B The liquid lead atoms have a slightly larger atomic radius than the solid lead atoms.
The liquid lead atoms are less closely arranged in a given amount of space than the solid lead atoms.
D
The liquid lead atoms have slightly less kinetic energy than the solid lead atoms.

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. 

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