An oxygen molecule contains a double bond because the two atoms of oxygen share a total of
(1) 1 electron (3) 3 electrons
(2) 2 electrons (4) 4 electrons

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li