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CLEP Chemistry - Blogs Sample Questions

Why doesn't CCl₄have a dipole moment?

Correct Answer:

resultant four bonds dipole is zero

carbon tetrachloride (ccl4) does not exhibit a dipole moment despite the polar nature of the c-cl bonds. each carbon-chlorine bond in ccl4 is polar, due to the difference in electronegativity between carbon (2.55) and chlorine (3.16), which causes a partial negative charge (δ-) on the chlorine atoms and a partial positive charge (δ+) on the carbon atom. however, the overall molecular polarity is determined not just by the existence of these individual dipoles, but also by their arrangement within the molecule.

the geometry of ccl4 is tetrahedral, with the carbon atom centrally located and four chlorine atoms symmetrically placed at the corners of a tetrahedron. this symmetric arrangement leads to the cancellation of the dipole moments. in a tetrahedral structure, each c-cl bond vector points from the central carbon to a vertex where chlorine is located. due to the symmetry, for every c-cl bond vector pointing in one direction, there is an equivalent c-cl bond vector of equal magnitude but pointing in the opposite direction. as a result, the vector sum of all the bond dipoles equals zero.

additionally, the misconception that ccl4 might be planar should be addressed. ccl4 is not a planar molecule; it is distinctly tetrahedral. if the molecule were planar, the symmetry would be different, and it might not necessarily lead to the cancellation of dipole moments as perfectly as in the tetrahedral arrangement.

in summary, the absence of a net dipole moment in carbon tetrachloride is due to the symmetrical tetrahedral geometry of the molecule which ensures that the dipole moments of the individual polar c-cl bonds exactly cancel each other out. this precise cancellation results in a non-polar molecule despite the presence of polar bonds.

Additional Blogs for CLEP - College Level Examination Program dfgdfgdfg

In your journey to get CLEP Chemistry certified it is important for you to have all information related to your exam. So we have pulled together a list of additional blogs that may be of interest to you because that are all related to the College Level Examination Program.