What is a reaction with a positive enthaply spontaneous

When the reaction is exothermic but undergoes a decrease in entropy, it is the entalpy term which favors the reaction. In this case, a spontaneous reaction is dependent upon a term being small relative to another term.

Well a chemical change is when substances are combined and the final product is permanent

For example ... baking a cake is a chemical change because the ingredients in the cake can't be separated as separate substances like they were in the beginning

A physical change is where the substances isn't changes, but just the appearance.

For example... origami or cutting paper is considered a physical change because even though it was cut or folded it is still paper.  

One similarity is that the physical and chemical changes are categorized under characteristic changes

-+ Hope I helped +-