Please help! I have 2 remaining attempts and only 2 of my answers are incorrect. Please let me know which reactions are wrong and where they should be put!

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

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

Which substance has non polar covalent bonds