The mass of a block of iron is 35 g. When the block of iron is added to a graduated cylinder containing 65 mL of water, the volume of the water and iron together is 69.5 mL. What is the density of the iron?

During cooling, the kinetic energy of the molecules falls. why does this happen? a. the motion of the molecules increases. b. the motion of the molecules slows down. c. the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.