A puddle of liquid water on the ground eventually disappears as the molecules enter the air in the gas phase. Did the water molecules vaporize or evaporate? Explain how you know.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

How might this scientific phenomena be explained? a paper clip floats on water.

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.