Density, mass, or volume can be used to identify an unknown substance

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

If maltose undergoes hydrolysis what subunits does it results to?