What Am I Riddles

Question: Whoever makes me can hear me, but nobody else can.

What am I?

Question: You put me on a table and cut me, but you don't eat me.

What am I?

Question: My first is often at the front door.
My second is found in the cereal family.
My third is what most people want.
My whole is one of the united states.

What am I?

Question: Not chest or box is now discussed. Money can be held in it, but just as we test its metal, within it there is rust.

[What is it?]

Question: I have two rings. I move by request. If the mixture isn't right I just sit and rest.

What am I?