Part A In the Tools menu, check Width to enable a ruler below the box. Drag the handle on the left and adjust the length of the
box to 5 nm. (Because no other dimensions of the box change, its length can be used as a substitute for volume.) Pump
the pump handle once fully. This should add 40 to 50 gas molecules to the container. The pressure gauge will fluctuate a
little bit, so watch it for a minute to estimate an average value. Record the pressure in the table.
In the Constant Parameter menu, select Temperature. Then drag the handle of the box to change its length to each of the
other values in the data table. Record the pressure for each length.
Pressure (atm)
Length (nm)
5.0
6.0
7.0
80
9.0
10.0

The answer should be c.

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. 

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

A1 a 2 a 3 ooh lol i think that's it