Originally Posted by charleski
Yes, that will force a page-break as the reader loads the file. If you don't want page-breaks then the next chapter needs to be part of the same file, give it a fragment identifier (<h2 id="chapter x">) and you can still reference it from the ToC.
Since MobileADE require each file to be under 300k when uncompressed, you'll need to have separate files (with inevitable page breaks) at some point if your book is long.
I believe only Sony readers still have the 300K limit, since they have not updated to the latest version.