The ability to do work or cause change is
Energy
The volume of one mole of any gas at STP is 22.4 L. So, at STP, the volume of 2.00 moles of hydrogen gas would be (22.4 L/mol)(2 mol H2) = 44.8 L.
I disagree, because a physical change changes the form, and a chemical change is a process where one or more substances are altered into new substances.
Because fluorine has a higher electronegativity