Which of the following processes would you expect to have a negative value for entropy? NaCl (s) Na + (aq) + Cl - (aq) H2O (s) H2O (l) NaCl (s) NaCl (l) 2 Al (s) + 3Br2 (l) 2AlBr3 (s) C2H5OH (l) C2H4 (g) + H2O (g)

Negative changes in entropy is associated with reactions that go from a more disordered state to a more ordered state. In this case, it will be the chemical reaction:

2 Al (s) + 3Br2 (l) - > 2AlBr3 (s)

This is because we have a mixture (high entropy) being reacted to form a solid (lower entropy).