a. Does it contain polar bonds?
Yes, C2H2 (acetylene) contains polar bonds. The carbon-hydrogen (C-H) bonds are polar because carbon and hydrogen have different electronegativities. Carbon is more electronegative than hydrogen, which creates a dipole moment in the C-H bonds.
b. Do the polar bonds cancel each other out?
Yes, the polar bonds in C2H2 cancel each other out. The molecule is linear, with the two carbon atoms in the center and the hydrogen atoms on either end. The dipole moments of the two C-H bonds are equal in magnitude but opposite in direction, so they cancel each other out.
c. Is this a polar or nonpolar molecule?
C2H2 is a nonpolar molecule. Although it contains polar bonds, the symmetrical linear shape of the molecule causes the dipole moments to cancel out, resulting in no net dipole moment. Therefore, C2H2 is nonpolar.