Multiple Choice
Which of the following molecular geometries would result in a polar molecule if all the peripheral atoms are the same?
1
views
13. Liquids, Solids & Intermolecular Forces
Molecular Polarity
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the polarity of an NH_3 (ammonia) molecule?
A
NH_3 is a nonpolar molecule because it has no lone pairs on the central atom.
B
NH_3 is a polar molecule because it is linear in shape.
C
NH_3 is a polar molecule because it has a lone pair on nitrogen and a trigonal pyramidal shape.
D
NH_3 is a nonpolar molecule because its bonds are evenly distributed.
Verified step by step guidance1
Identify the central atom in the NH_3 molecule, which is nitrogen (N).
Determine the number of bonding pairs and lone pairs on the nitrogen atom. Nitrogen has three hydrogen atoms bonded and one lone pair of electrons.
Use VSEPR theory to predict the molecular geometry. With three bonding pairs and one lone pair, the shape is trigonal pyramidal, not linear or symmetrical.
Consider the electronegativity difference between nitrogen and hydrogen. Nitrogen is more electronegative, so the N-H bonds are polar.
Analyze the overall molecular polarity. Because of the lone pair and the trigonal pyramidal shape, the dipole moments do not cancel out, making NH_3 a polar molecule.
Related Videos
Related Practice
Molecular Polarity practice set
Problem sets built by lead tutorsExpert video explanations