2 riddles with cobra

Is there any specific kinds of riddles?

I got it from this site since i couldnt think of one ... (sorry)

1. This is sometimes called a serpent

And its skin has a lot of scales

It can have a venomous bite

And some have rattles in their tails

2. I have no legs but I’m not a broken chair

I have scales but I don’t weigh things

I sometimes have a rattle but I’m not a baby

I’m sometimes an adder but I don’t have a calculator

I scare many people but I’m not a spider

I was in the Garden of Eden but I’m not Adam or Eve