Can an ionic bond exist in a molecular formula?

Which statement justifies that phosphine (ph3) is a polar molecule?

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh