Questions & Answers about На кухне готовится кофе, а я ставлю чашки на стол.
Because Russian does not always match English prepositions word-for-word.
With кухня, Russian normally says на кухне for in the kitchen. This is just the usual idiomatic choice.
So:
- на кухне = in the kitchen
- not usually в кухне in normal speech
A good rule for learners is: learn the noun together with its usual preposition.
Examples:
- на кухне = in the kitchen
- в комнате = in the room
- в доме = in the house
So even though English uses in for all of these, Russian uses different prepositions depending on the noun.