What are the signs of the entropy change (+ or-) in the following:
I: A liquid crystallizes into a solid
II: Temperature of a crystalline solid is raised from 0 K to 115 K
III: 2NaHCO_3(s) $\to {\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}\left(\text{s}\right)}{\text{+CO}}_{\text{2}\left(\text{g}\right)}{\text{+H}}_{\text{2}}{\text{O}}_{\left(\text{g}\right)}$
IV: ${\text{H}}_{\text{2}\left(\text{g}\right)}\to {\text{2H}}_{\left(\text{g}\right)}$