Molecular Shapes and Polarity in Chemistry

The video tutorial covers the molecular geometry and polarity of methanol, ammonia, and methylamine. It explains the tetrahedral shape of carbon in methanol and the bent shape of oxygen. The structure of ammonia is described as pyramidal, with nitrogen being partially negative due to its higher electronegativity. Methylamine is analyzed with carbon and nitrogen as central atoms, highlighting the polar nature of the carbon-nitrogen bond and the nonpolar carbon-hydrogen bond.

What is the molecular shape of carbon in methanol?

• Linear

• Tetrahedral

• Bent

• Trigonal Planar

Why is the oxygen in methanol considered to have a bent shape?

• It has two bonds and two lone pairs.

• It has four bonds.

• It has no lone pairs.

• It is bonded to four different atoms.

How many total electrons are involved in NH3?

• 8

• 10

• 6

• 12

What is the shape of NH3 based on its electron density?

• Tetrahedral

• Pyramidal

• Linear

• Bent

Which atom in NH3 is partially negative due to its electronegativity?

• Hydrogen

• Nitrogen

• Carbon

• Oxygen

In CH3NH2, which atom is the central atom for the carbon section?

• Hydrogen

• Nitrogen

• Carbon

• Oxygen

How many total electrons are present in CH3NH2?

• 16

• 14

• 12

• 10

What is the shape of the nitrogen atom in CH3NH2?

• Linear

• Bent

• Tetrahedral

• Pyramidal

Which bond in CH3NH2 is considered nonpolar?

• Carbon-Nitrogen

• Nitrogen-Hydrogen

• Carbon-Hydrogen

• Oxygen-Hydrogen

What is the overall polarity of the nitrogen atom in CH3NH2?

• Completely negative

• Partially negative

• Neutral

• Partially positive