For wach of the following cases, state whether the density of the object increases, decreases, or remains the same:
(a) a sample of chlorine gas is compressed
(b) a lead weight is carried up a high mountain.
(c) a sample of water is frozen.

a) increases.

b) remains the same.

c) decreases.  the hydrogen molecules constrict or shrink from actual size!

Explanation:

Since ,

Density is given as mass divided by the volume .

( a ) As the Chlorine gas is compressed , the molecules of gas comes close to each other , and hence , the density increases .

( b ) When the lead is taken to high mountain , its density remains the same , as density is independent of higher pressure , as going to mountain will increase the pressure .

( c ) As the water is freeze , its density decreases ,

Because ice is less dense than water , as seen , the ice ice can float on the surface of water .