Final answer:
The nonpolar molecules from the list are N₂, CCl₄, and BBr₃ because they have either identical atoms or symmetric shapes that result in an even distribution of charge.
Step-by-step explanation:
The question asks about the polarity of certain molecules and provides information about molecular polarity. Polarity is determined by the difference in electronegativity between bonded atoms and the symmetry of the molecule. For a molecule to be polar, it must have polar bonds, and the molecule must not be symmetric.
As the details provided suggest, certain shapes like tetrahedral (CH4) or trigonal planar (BF3) are typically nonpolar if all the peripheral atoms are the same and there are no lone pairs of electrons on the central atom.
To answer which molecules are nonpolar:
- N2 is nonpolar because it consists of two nitrogen atoms with the same electronegativity, sharing electrons equally, and the molecule is linear and symmetric.
- CCl4 is nonpolar because it is a tetrahedral molecule where all peripheral atoms are identical (chlorine atoms) and there are no lone pairs on the central atom (carbon), leading to a symmetric distribution of charge.
- BBr3 is nonpolar because it is a trigonal planar molecule with the same atoms (bromine) around the central atom (boron), making it symmetric.
The other molecules listed (HBr, CH3Cl, H2S) are polar because they either have atoms with different electronegativities or the shape of the molecule leads to an asymmetric distribution of charge.