"– What and where do you study? – Chemistry in Paris."
Translation:– Mitä ja missä sinä opiskelet? – Kemiaa Pariisissa.
Pronouns like sinä come after the verb, if the verb ends in -ko. If the verb doesn't end in -ko, then I think pronouns normally go before the verb.
Nouns that aren't pronouns, like kissa, I think normally come before verbs which aren't on.
Before on, a noun is definite. Missä kissa on?: "Where is the cat?" After on, a noun is indefinite. Missä on kissä?: "Where is a cat?"