Nonpolar substances do not dissolve in polar solvents like water. If you are conducting an investigation to test the solubility of different substances, which of these substances do you expect to be insoluble in water?
(a) ammonia (NH3)
(b) hydrogen sulfide (H2S)
(c) hydrogen fluoride (HF)
(d) silane (SiH4)

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.