HumanFerret hates being with humans

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Astudent completes a titration by adding 12.0 milliliters of naoh(aq) of unknown concentration to 16.0 milliliters of 0.15 m hcl(aq). what is the molar concentration of the naoh(aq)? 1)5.0 m 2)0.20 m 3)0.11 m 4)1.1 m