Use the reaction to answer the question. NH_ 4 + H_ 2 O →OH- + NH_ 4. Which statement about the reaction is correct? a.) h_2O is a base, and NH_4+ is its conjugate acid.
b.) NH_3 is a base, and NH_4+ is its conjugate acid.
c.) NH_3 is a base , and OH- is its conjugate acid.
d.) H_2O is a base, and Oh- is its conjugate acid.

Answer( precipitate );

Hcn is your answer my guy : )

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.

Melting increases as mass increases. since alkanes are not branched molecular structures, the one with the heavier mass will have higher melting point.  octane's mp > butane's mp