What is the formal charge on the hydrogen atom in hf?

Matches the chemical name of each oxide of phosphorus to its chemical formula

Air can be considered a mixture. which statement does not explain why?

Acandle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. the wick is usually surrounded by wax. which is the most important property of covalent compounds that makes them useful for making candle wax? a low boiling point a low melting point a high boiling point a high melting point