Is This Chapter One?

(I wrote this after several workshopping experiences in which I ended up telling people that while this might be a fine chapter, it wasn't chapter one. To be fair, chapter one can be very difficult to find. In my experience, newbie writers tend to do a lot of build up to chapter one--and I have to tell them to cut six chapters before chapter one. More seasoned writers have become paranoid about this and therefore tend to try to cut to the case by leading with what they think is a very exciting scene, but which may not make sense without some lead-up. Warning: I tend to like a slow build in a story, which isn't to everyone's taste.)
Does this make sense to those who know nothing about the story before reading this? (That is, does it start with a reasonable amount of world-building information)
Is this a scene w/o interruption and flashback? Is it a linear story?
Is this more than one scene to be parsed by the reader, especially if told by multiple povs?
Am I starting with an action scene that has no context?
Will there be a death in the first chapter that propels the rest of the story, but which the reader cares nothing about?
Is this really a prolog about different characters than the rest of the book?
Is this a frame or a portal story and do I introduce characters/themes that will not matter to the rest of the book?
Am I telling a part of the story that only I as the writer need to know?
Is this the most compelling part to begin with?
Does this have an inciting incident that propels forward motion to the rest of the book?