The Covalent Model · Paper 2 — Free Chemistry HL Practice Questions

Both $\text{CH}_4$ and $\text{CHCl}_3$ have tetrahedral molecular geometry. Explain why $\text{CH}_4$ is non-polar overall while $\text{CHCl}_3$ is polar overall. [2 marks]

The experimental dipole moment of $\text{CHCl}_3$ is $1.04\,\text{D}$. The theoretical dipole moment for a fully ionic $\text{C}^+\text{Cl}^-$ bond of the same bond length is $11.2\,\text{D}$. Calculate the percentage ionic character of the C–Cl bond in $\text{CHCl}_3$. [2 marks]