Final answer:
The fermentation of glucose to produce alcohol and CO₂ is an exothermic reaction, as it releases heat indicated by the negative enthalpy change of -67 kJ.
Step-by-step explanation:
The equation for the fermentation of glucose to alcohol and CO₂ has an enthalpy change of -67 kJ. A reaction is considered exothermic when it releases heat, indicated by a negative enthalpy change. Conversely, an endothermic reaction absorbs heat, which would be indicated by a positive enthalpy change. In the case of the fermentation of glucose, since the enthalpy change is -67 kJ, this reaction is exothermic, releasing heat into the surroundings.