Propane, the gas used in barbeque grills, is made of carbon and hydrogen. will the atoms that make up propane form covalent bonds? why or why not

There are multiple tuning forks present in the room, and annie strikes one with a natural frequency of 400 hz. which of these other tuning forks will begin to vibrate through resonance and make the sound louder? a 200 hz tuning fork a 400 hz tuning fork a 800 hz tuning fork a 1600 hz tuning fork