What must be true for a substance to dissolve in water? Medal and fan
A. The energy required to break bonds apart must be greater than the energy released from the substance reacting with the solvent
B. The enthalpy and entropy terms must combine to a favored reaction
C. The entropy term must be positive
D. The free energy change of dissolving must be positive.

Would it be B?

Question

What must be true for a substance to dissolve in water? Medal and fan
A. The energy required to break bonds apart must be greater than the energy released from the substance reacting with the solvent 
 B. The enthalpy and entropy terms must combine to a favored reaction
C. The entropy term must be positive 
D. The free energy change of dissolving must be positive.

Would it be B?

anonymous · Answer

@aaronq Could you help me with this one as well?(:

aaronq · Answer

Indeed it is B. $\Delta G$ is a predictor of spontaneity for any chemical reaction and its composed of enthalpy and entropy terms (as well as temperature).

$\Delta G = \Delta H-T \Delta S$

aaronq · Answer

$\Delta G>0$  is non spontaneous
$\Delta G<0$ is spontaneous

anonymous · Answer

Yep, that's what I thought. I always doubt myself in the back of mind about things in Chem, but I usually turn out right haha

aaronq · Answer

haha well if you can provide a sound reasoning for your choice there isn't much you should  worry bout !