Answer (score:0.5): 17. Select two substances that contain both covalent and ionic bonds. 1) SO_(2) 2) K_(3)PO_(4) 3) NaCl 4) H_(2)SO_(4) 5) NH_(4)NO_(3) Answer (score:1):

The correct answer is 2) $K_{3}PO_{4}$ and 5) $NH_{4}NO_{3}$.<br /><br />$K_{3}PO_{4}$ (potassium phosphate) contains both ionic bonds between the potassium ions (K+) and the phosphate ions (PO4^3-), and covalent bonds within the phosphate ion itself.<br /><br />$NH_{4}NO_{3}$ (ammonium nitrate) contains both ionic bonds between the ammonium ions (NH4+) and the nitrate ions (NO3-), and covalent bonds within the ammonium ion and the nitrate ion.