Identify the excess or deficiency of electrons in each atom relative to an atom of the closest noble gas. Then predict the formula of the compound formed when these elements interact: 1a.) sodium and chlorine ( to form sodium chloride)

1b.) calcium and oxygen (to form calcium oxide)

1c.) magnesium and chlorine (to form magnesium chloride)

1d.) aluminum and oxygen (to form aluminum oxide)

Identify the electromagnets with poles that are reversed from the electromagnet shown above

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 .

The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?