Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. Subtract the electronegativities for the following pairs of elements and predict whether they form a
covalent bond
1A
Electronegativity difference of N and H

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.