Explain the following on the basis of the behavior of atoms and/ or ions.
a. Cooking with hot water is faster in a pressure cooker than in an open pan.
b. Salt is used on icy roads.
c. Melted sea ice from the Arctic Ocean produces fresh water.
d. CO2(s) (dry ice) does not have a normal boiling point under normal atmospheric conditions, even though CO2 is a liquid in fire extinguishers.