What scares the snake?
fire, smoke, bright lights, bigger snakes
look on the net for high frequency signals and play them they usually scare any animal that can hear them but if you're asking because it's like in your backyard just don't kill it please and what that guysaid
Stomping. Anything big enough to stomp the ground to make it vibrate is big enough to stomp the snake.
Eve and God
Depends what type really. For example rattle snakes are very territorial snakes and will hold their ground from predators, but snakes like garter snakes will try and find the quickest escape.