suddenly
The branch suddenly snapped.

easily
off
One of the table's legs had been snapped off.

snap (sth) in half, snap (sth) in two
She picked up the pencil and snapped it in two.

snap (sth) open, snap (sth) shut
She snapped the lid shut.

snap (sth) together
The plastic pieces snap together to make a replica of a dinosaur.

angrily, harshly, impatiently, irritably, sarcastically, sharply
back
‘How should I know?’ Jen snapped back.

at
He lost his temper and snapped irritably at the children.

finally
My patience finally snapped.

suddenly
TV reports of a man who suddenly snapped and killed himself and his family

just, simply
I guess he just snapped.

Snap is used with these nouns as the subject:
dog, elastic, patience, photographer, self-control, twig

Snap is used with these nouns as the object:
finger, jaw, photo, picture, salute, shot, streak, twig