Why is there little heat retained in the warm thermosphere? a. the pressure is too low c. the molecules move too fast b. the pressure is too high d. there are too many molecules to transfer heat

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Do polar molecules have ionic bonds?