“gasoline boils at a relatively low temperature (about 150°c). the kerosene is removed at around 200°c, followed by diesel oil at 300°c and fuel oil at around 370°c.”
what topic is the teacher most likely talking about?

Explanation:

Quick Likely fractional distillation.

The distillation taking place has heat that is not uniformly distributed. Hot air rises, so the temperature at the top is greated than at the bottom. When petroleum is distilled various organics come off at various temperatures and at different levels of distillery apparatus.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).