Question

determine which intermolecular forces are the dominant (strongest) forces for a pure sample of each of the following molecules. nh₃ possible answers h - bond ldf hbr no answers chosen no answers chosen chcl₃ ch₃cooh ddi cl₂ no answers chosen ne

Explanation:

Step1: Recall intermolecular - force rules

Inter - molecular forces include London dispersion forces (LDF), dipole - dipole interactions (DDI), and hydrogen bonding (H - bond). LDF exist in all molecules, DDI in polar molecules, and H - bond when H is bonded to N, O, or F.

Step2: Analyze NH₃

NH₃ has N - H bonds. Hydrogen bonding occurs when H is bonded to N, O, or F. So, the dominant force in NH₃ is H - bond.

Step3: Analyze HBr

HBr is a polar molecule. The electronegativity difference between H and Br creates a dipole. So, the dominant force is DDI.

Step4: Analyze CHCl₃

CHCl₃ is a polar molecule due to the asymmetric distribution of Cl atoms around the C atom. The dominant force is DDI.

Step5: Analyze CH₃COOH

CH₃COOH has O - H bonds. Hydrogen bonding occurs because of the presence of the O - H group. So, the dominant force is H - bond.

Step6: Analyze Cl₂

Cl₂ is a non - polar molecule. The only intermolecular force present is LDF.

Step7: Analyze Ne

Ne is a noble gas and a non - polar monoatomic species. The only intermolecular force is LDF.

Answer:

NH₃: H - bond
HBr: DDI
CHCl₃: DDI
CH₃COOH: H - bond
Cl₂: LDF
Ne: LDF