It's like asking "Do all humans sit down cross-legged?" - It depends on the circumstances and the mood of the snake in question. It's not specific to species.
Basically, yes - when they feel like it.
Snakes can coil around their prey, and they do have a back bone. But poisonous snakes don't need to do it much. The venom kills the prey which can then be eaten in peace and quiet. The constrictors, non-venomous snakes, have to coil aroud their prey to prevent it from getting away.
Not necessarily coil. My Royal Pythons, at feeding time, just form their head and neck into a tight 'S' shape - lunging at the food item when it's dangled in front of them.
all snakes have a tendency to coil when threatened and can strike about half to a third of their size. however, they prefer to get away rather then have a confrontation. so, if a snake is coiled simply step back slowly and it will leave without a problem. (do not try to approach a snake that is coiled unless you are trained in herpetology.
Florida you can also find them in South Carolina
Because they are storing energy. Imagine a spring. It cannot "spring" very far unless compressed, because when it is compressed the amount of potential energy the spring contains is greatly increased. When you let the spring go, the potential energy converts to kinetic energy and you can't find where the spring went. Same principle for snakes that coil before they strike. The more they coil, the faster and farther they can strike at prey or predator. This asked WHAT snakes coil ... not WHY do snakes coil ... this does not answer the question.
Everything goes in ONE DIRECTION. So yes
no. all snakes are carnivores
Snakes might get mad if they are cornered or are afraid that you will hurt them. Snakes that are angry will often coil into a small ball, rear their head up to strike out, or rattle their tails to warn you of the danger.
rattle snakes coil and emit the hiss sound of its rattle. When they coil that is the position were they can do the jump to attack and bite injecting the venom.
Well commonly snakes use venom which comes out from their teeth, while others coil around their intended victim and suffocate them, and also camouflage
All snakes have backbones.
Not all snakes do, no.