Help Needed! How to tell whether to play a note with left hand or right hand?

[libraboy]

Hey guys,

I'm learning the Anton Rubinstein Grande Etude No 2 (Op 93, No 2). However I just can't figure out which of the notes in the scales passages you play with your left hand and which with your right hand. That's particular the case with the first note of the scale (the rest of the notes in the scale I can figure out by the direction of the note-stems), as sometimes the first note of the scale is a chord with multiple notes, so I don't know to play the whole chord with the same hand or split it with both hands)

For example, in the first scale of the etude (The A major scale), do I play the first A with my left hand or right hand? (I assume the rest of the scale I play with my right hand since the note-stems are pointing up). Then what about the first G in the next scale?

Thanks so much! (I've attached some sheets from the score below and the full score is at https://ks.imslp.net/files/imglnks/usimg/a/a8/IMSLP08346-Rubinstein_-_Op.93_-_Miscellenies_-_Bk.2_-_2_Grandes_Etudes.pdf)