One great definition of a scene is a moment when an emotion is articulated in some way, usually via action.
Important: Scenes are not necessarily complete. They don't require a beginning, middle, and end. But they usually offer developed ideas, developed characters and setting and action or information. Scenes often leave us hanging, which tells us there will be another scene later to finish the story. We'll read on to find out where the thread continues.
What's a Chapter?
In nonfiction, a chapter concludes more overtly. There's a hook to future material, certainly; otherwise, why would we read on? But nonfiction chapters deliver information and there's a sense at chapter's end that we've received enough to ponder and absorb. Nonfiction chapters often end with completion of thought, while fiction and memoir leave something deliberately unfinished.
Creating Transitions between Scenes and Chapters
Example: Oranges are peeled at the end of one scene and an orange glow is in the sky at sunrise in the beginning of the next. These scenes might be in different times, even take place in different eras if one is a flashback, but the reader will be able to transition because of the repeating image.
Transitions are not just visual: they can be smells, sounds, heat or cold, light or dark, a piece of furniture or a room or an object--whatever has meaning and can be repeated without too much fanfare.
The idea is to plant the image then return to it, creating a good transition as you do. They are fun to think of--and worth studying in books you admire! I bet you don't even notice them in these admired books at first. That's good writing.