12. When the coordinate covalent bond of the hydronium ion (H3O+) is formed, the oxygen atom (O):
(A loses electrons
(B) shares with one of its electrons
(C) shares with two of its electrons
(D) shares with four of its electrons

What is the temperature of one mole of helium gas at stp?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of

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?