Given the equation deltaG = deltaH - T deltaS, which set of conditions would result in a reaction that is unambiguously nonspontaneous? A. entropy decreases and the reaction is endothermic B. entropy increases and the reaction is exothermic C. entropy stays the same and there is no change in enthalpy D. entropy decreases and the reaction is exothermic

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

How does the motion of particles in a gas change as the gas cools