Heat can never flow from . . a.. hot to cold. . b.. cold to hot. . c.. liquid to solid. . d.. solid to liquid

If two objects at different te, peraure are in contact with each other what happens to their temperature

Find the mass, in grams, of 5.00*10^23 molecules of f2

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?