化学 + Noun
The noun 化学 (huàxué) means 'chemistry.' It refers to the scientific discipline that studies the composition, structure, and reactions of substances. It also appears as a modifier in compounds like 化学物质 (chemical substance) and 化学反应 (chemical reaction).
她在大学学的是化学专业。
Tā zài dàxué xué de shì huàxué zhuānyè.
She studied chemistry as her major in college.
化学课上我们做了一个有趣的实验。
Huàxué kè shàng wǒmen zuò le yí ge yǒuqù de shíyàn.
We did an interesting experiment in chemistry class.
他对化学反应的原理很感兴趣。
Tā duì huàxué fǎnyìng de yuánlǐ hěn gǎn xìngqù.
He is very interested in the principles of chemical reactions.