What does noch do here?

What is with all of these colloquialisms?

Why don't they translate the "da", why not write: "Is there still any sugar there?"

Noch is defines as another, still, or yet, none of which appear in the translated sentence. Yet another idiomatic idea without context or explanation.

Please, I need clear explanation for the structure of the sentencem espicially (noch). Isn't (noch) supposed to mean (yet) while (immer noch) mean (still)??

Thanks

I'm struggling with "noch" - it appears have multiple meanings like "schon" and "mal". Any easy tips for learning and distinguishing between these words would be greatly appreciated.