When you burned copper, the product copper oxide appeared on the wire. Besides copper, the other reactant is
air
⇒ oxygen, O2.
Explain how you know it must be oxygen. Where did the oxygen come from?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.