<span> Well, I believe that During this </span>phase<span>, the cell makes a variety of proteins that are needed for DNA replication. During S </span>phase, which follows G1 phase<span>, all of the </span>chromosomes<span> are replicated.
NH3 is soluble in water because it has the same amount of intermolecular forces as water. NH3 is a polar molecule and water is a polar molecule so they dissolve each other. NCl3 does not dissolve in water because it is a nonpolar molecule which is different with water. NCl3 is nonpolar due to the difference in electronegativities between 3 atoms of Cl and 1 atom if N2.
Note that melting and vaporization are endothermic processes in that they absorb or require energy, while freezing and condensation are exothermic process as they release energy.
