化学

1. Origins, structure, and basic meaning

• Structure: 化学 (かがく) is a noun for the field of science studying substances, properties, and change.
• Basic usage: 化学実験で変化を観察する forms the name of a school experiment in the discipline, while 化学の知識 modifies knowledge applied in cooking.

2. Common pitfalls and similar expressions

• Experiment label and field of knowledge
  • The head of 化学実験 is 実験, and the head of 化学の知識 is 知識. The cooking itself is not called a chemistry class; knowledge from that field is applied to it.