This is the 6362nd most frequent Russian word.
химии
The Russian word "химии" translates to "chemistry" (genitive or dative singular, or nominative plural) in English.
химии is in the genitive case, indicating possession or association.
Учитель химии подготовил для нас интересный урок.
The chemistry teacher prepared an interesting lesson for us.
химии is in the prepositional case, indicating the subject of the lesson being discussed.
На уроке по химии мы проводили эксперименты.
In the chemistry lesson, we conducted experiments.
химию is the accusative case of химия, used as a direct object in the sentence, representing the subject of study.