Is oxygen a pure substance or a mixture?

Answer by  HelpChat (494)

Oxygen is a pure substance, although humans rarely encounter it. We typically encounter O(2), oxygen gas, which is also pure, but not when it is mixed in the air.

Answer by  sonicfoundation (2597)

Oxygen itself is a pure substance. It is a substance that cannot be broken down from itself into another element.

Answer by  mckenzieclare (4)

is alcohol a pure substance or mixture?