BrainMass Quizzes Thermochemistry The quiz helps in revising basic concepts about thermochemistry. 1 The delta H for a given reaction is positive and the delta S for the same reaction is negative. This reaction will be spontaneous at all T at no T at high T at low T 2 Substances in which phase typically have the highest entropies: solid liquid gas need more information 3 For a spontaneous process, the entropy for a system and its surroundings always increases decreases does not change need more information 4 For exothermic reaction, change in enthalpy, delta H is positive negative can be positive or negative need more information 5 For endothermic reaction, change in enthalpy, delta H is positive negative can be positive or negative need more information Submit Quiz