Question

(a) In a chemical reaction a solid decomposes to form two different gases. Would you expect DS to be positive, negative, or close to zero for this reaction?


DS for this reaction should  ---Select--->> be positive, be negative, or be close to zero .





(b) In which of the processes described below should the entropy increase? Choose all of the correct possibilities.

ice cubes melting at -5 ^oC and 1 atm pressure

breakdown of large molecules into smaller ones during digestion of a meal

formation of ice cubes in an ice-cube tray in a freezer

formation solid rust (iron(III) oxide) by oxygen in the air reacting with the iron in an old boat

formation of CH₄(g) and O₂(g) molecules from CO₂(g) and H₂O(l) at room temperature and 1 atm pressure

Answer 1