Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions AH is (pick one) This reaction is exothermic and proceeds faster at temperatures above -48. C. AS is (pick one) AH is (pick one) B This reaction is spontaneous only below 65. C. AS is (pick one) AH is (pick one) This reaction is spontaneous except below 129. C. AS is (pick one)