When an atom of phosphorus becomes a phosphide ion (p3–), the radius
(1) decreases
(2) increases
(3) remains the same?

Is a pencil falling to the floor anon contact force, a force, or a contact force

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .