Disable Hangouts Notifications
How to disable Google Hangout chat notifications in Gmail and on your Chromebook
Disabling notifications doesn't mean you won't receive the messages, it just means they'll stop distracting your focus and you can reply to messages when you're ready. It is critical every student manage your Hangout notifications, otherwise, if the distractions grow to great, we will have to disable the feature.
To turn off notification, click on the settings of the hangout:
Then uncheck the Notification box
If you notice students using Hangouts inappropriately please report them to your student management team.