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A chapter generally needs a miniature conflict and arc of its own, and as such must have some kind of tension. As you pointed out, having multiple characters makes it somewhat easy, but a character...
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Source: https://writers.stackexchange.com/a/38403 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
A chapter generally needs a miniature conflict and arc of its own, and as such must have some kind of tension. As you pointed out, having multiple characters makes it somewhat easy, but a character that's alone _seemingly_ can't bring a conflict or arc about. Here, one has to shift the focus to internal conflict. In the novel I'm writing, I've recently come across such a dilemma, as a couple of chapters of the novel is covering a young girl who's smuggled herself out of her city in a crate... well, sitting around in a crate and scavenging for food and drink when she knows she won't be seen leaving said crate. She doesn't say a word, however, what she _does_ do is wrestle between regretting her bid for freedom and standing by it, reflecting on the irony of pursuing freedom by trapping herself in a box, thinking about her sister (who was the only part of her home that she truly loved) and dreaming of what she thinks her destination is (setting her up for a payoff when she ends up anywhere but where she intended). So yes, either shift to internal conflicts, or as I alluded to in the last example, use the alone time to demonstrate the characters' expectations of the future in order to set up future conflict.