When a writer ends a scene or chapter, he wants to do two things. He wants to leave the scene’s or chapter’s protagonist worse off than they were before. (Except, perhaps, at the very end of the story or book. More on that in the next article.) And because of that, he wants to leave the reader wanting to read more. No, needing to read more.
The end of every scene or chapter should in some way launch the reader into the next one. That launch doesn’t have to be the equivalent of a giant rocket blasting off for deep space. It could be a gentle shove, or a subtle but irresistible suction that pulls them onward. But gentle or gigantic, push or pull, it needs to be undeniable: the reader can’t say no to it.