Which statement BEST explains why lipid molecules are generally insoluble in water? A.
Carbon-hydrogen bonds are non-polar.

B.
Carbon-hydrogen bonds are polar.

C.
Carbon-oxygen bonds are non-polar.

D.
Carbon-oxygen bonds are pola

The answer is nitrogen-containing bases

Its the second one nonmetals are moldable and easily shaped 

It is a ok  i know i have a brain functioning well.                                                                                                                                                           

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m