No, not the smelly chemicals mixed up by a chemist. We're talking real yummy food chemicals. Hot fat can also carry these chemicals into the air. That's why you can taste sizzling bacon before you eat it. Some of the flavor molecules are already in your nose and mouth.
Fats melt at body temperature.
That's why, when a fatty food like chocolate melts in your mouth, you feel a smooth, full, coating sensation. It feels nice. When you eat, your body breaks down the food for energy. But fat takes longer than any other types of food to break down. So fat makes us feel full longer.