Which option as an example of a chemical property? a. boiling point b. rusting ability c. melting point d. density

A chemical property would be Rusting ability.  Since rusting in itself is a chemical change, the property of the ability to rust would be it.  A chemical change is one in which a new compound is formed, and all other properties are simply physical properties.

i would say b probably

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google