How is geometrical symmetry related to the polarity of a molecule?

an asymmetrical molecule is always nonpolar.

an asymmetrical molecule can never be polar.

a symmetrical molecule is always nonpolar.

a symmetrical molecule is always polar.

When the volume and number of particles of a gas are constant which of the following is also constant

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?