Final answer:
In chemical thermodynamics, a reaction with a positive ΔH is endothermic, absorbing heat, while a reaction with a negative ΔH is exothermic, releasing heat. Option B
Step-by-step explanation:
The question relates to the thermodynamics of chemical reactions, specifically the concepts of endothermic and exothermic processes. ΔH, or change in enthalpy, is a measurement of heat energy absorbed or released in a reaction.
For a reaction where ΔH is positive, heat is absorbed from the surroundings, and the reaction is endothermic. Conversely, when ΔH is negative, heat is released into the surroundings, making the reaction exothermic.
Therefore, the correct match for the associations is the following:
B. Positive ΔH - Endothermic, Negative ΔH - Exothermic