Sometimes websites, like Facebook, will ask you to turn on notifications in Chrome. This is not an issue if you are on your home computer, but if you are on your teaching computer at school, this can be a problem. Thankfully turning off notifications in Facebook is really easy.
Go to your Facebook account.
Click the lock in the top right corner.
Select "See More Settings"
Select "Notifications" on the left side of your screen.
Under the Desktop and Mobile section go to Desktop. There will be a section for Chrome. If you have it enabled, you will be able to choose Turn Off.