What are three chemical changes and what are three physical changes?

Chemical changes:

burning wood

digesting food

mixing acid and base

Physical changes:

breaking a bottle

melting an ice cube

crumbling a sheet of paper

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.