In order to produce 972 kJ of heat, how many grams of H2 must react? 2 H2 (g) + O2 (g) → 2 H20 (g) + 243 kJ

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Light waves can move through , but they travel fastest when they move through a(n) .