Final answer:
The most appropriate type of graph for displaying results from enthalpy reactions is 'Heat vs. time', which corresponds to a Potential Energy Diagram or a heating curve.
Step-by-step explanation:
The type of graph useful for displaying results from enthalpy reactions is a Potential Energy Diagram. This type of graph, which can show the change in potential energy as reactants turn into products, is essential for visualizing the energy changes during a chemical reaction. Specifically, the correct answer is Option B: Heat vs. time, which can also be considered as an enthalpy graph or a heating curve when it involves a plot showing the relationship between heat added to a system and its temperature change, along with any phase changes.
An enthalpy graph can clearly illustrate whether a reaction is endothermic or exothermic by showing the energy absorbed from or released to the surroundings. For example, the Potential Energy Diagram for an endothermic reaction shows an increase in the total potential energy of the system, indicating that the system absorbs energy, while for an exothermic reaction, it would show a decrease.