How many electrons can be contained in the second energy level? a. 2 b. 18 c. 10 d. 8

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How might this scientific phenomena be explained? a paper clip floats on water.

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases