Question

Caffeine is a stimulant that increases feelings of alertness. Considering it dissolves in water, which pair of terms describes caffeine?
Responses

Hydrophobic; non-polar
Hydrophobic; non-polar

Hydrophobic; polar
Hydrophobic; polar

Hydrophilic; non-polar
Hydrophilic; non-polar

Hydrophilic; polar
Hydrophilic; polar

Answer 1

Caffeine dissolves in water, which indicates that it interacts favorably with water molecules. Therefore, it is considered to be "hydrophilic," which means it has an affinity for water. Additionally, caffeine has polar functional groups, making it a polar molecule overall.

The correct pair of terms that describes caffeine is:

**Hydrophilic; polar**