Except when they move the launch bar from here to there or hide scrollbars or make any of a million other changes that cause your screen to no longer resemble the screenshot you're trying to learn from.
I updated a couple weeks ago and every tab was discarded when I tabbed away, reloaded when I tabbed back. It's better now. I can only imagine the problems that would cause for a school with a couple hundred of these checked out.
install session buddy from the chrome web store. it saves your tabs automatically, & even restores sessions containing a mix of tabs & web "apps" accordingly.