You place a balloon in a closed chamber at stp. when the balloon doubles in size, what happens to the chamber pressure? a.) the pressure stays the same b.) the pressure doubles c.) the pressure reduced by one half

If you increase the volume the pressure will decrease.  so the best answer is C

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.