So, i don't remember exactly how do Ron and Hermione enter to the chamber of secrets

Ron told Harry that he сказал(-а) the same thing Harry did to open the locket. It сказал(-а) so in the book.

Ron just made a bunch of hissing noises.

In the секунда movie Harry spoke Parsel Tongue to open the Chamber of Secrets, and Harry told Ron in the 7th movie Ты have to speak Parsel Tongue to open a horcruxe, so Ron tried a few times to open the Camber of Secrets

Ron learned parseltongue by watching Harry speak parseltongue.

In the book, Ron remembered the sounds Harry made to open various things and (tried) to imitate it. In the movie, Ron Комментарии that Harry "talks" parsletongue in his sleep, and Ron just imitated the noises he heard Harry make.

In the seventh movie when Ron opens the chamber of secrets he says that Harry talks in his sleep.