Determining entropy changes in chemical reactions.

A screenshot of a digital worksheet on an iPad, showing a list of chemical reactions with handwritten annotations indicating whether each reaction results in an increase or decrease in entropy. The reactions involve various states of matter (solid, liquid, gas) and include compounds like KClO₃, H₂O, N₂, H₂, NH₃, NaCl, KCl, CO₂, H⁺, C₂H₃O₂⁻, HC₂H₃O₂, C, O₂, H₂, Cl₂, HCl, Ag⁺, Cl⁻, AgCl, NO₂, NO, and O₂. The annotations use plus and minus signs to denote entropy changes.