Comparative Properties of NH3 and PH3

The video tutorial explores the differences in boiling points between NH3 and PH3, focusing on the role of electronegativity. Nitrogen is more electronegative than phosphorus, leading to NH3 being a polar molecule with stronger intermolecular attractions. This results in NH3 having a higher boiling point compared to PH3, which has minimal polarity due to similar electronegativities of hydrogen and phosphorus. The tutorial highlights how these differences in molecular structure and electronegativity affect the physical properties of these compounds.

What is the main similarity between NH3 and PH3?

• They have different Lewis structures.

• They have different molecular geometries.

• They belong to different groups on the periodic table.

• They have the same molecular geometry.

Which element is more electronegative, nitrogen or phosphorus?

• Phosphorus

• Nitrogen

• Both have the same electronegativity

• Neither is electronegative

How does the electronegativity of nitrogen affect NH3?

• It makes NH3 a non-polar molecule.

• It causes NH3 to have a higher boiling point.

• It results in NH3 being a polar molecule.

• It has no effect on NH3.

What is the visual representation of NH3's molecular structure?

• Red on top, blue on bottom

• Yellow on top, green on bottom

• Blue on top, red on bottom

• Green on top, yellow on bottom

Why are polar molecules attracted to each other?

• Because they have the same charge

• Due to the presence of hydrogen bonds

• Because they have negative and positive sides

• Due to their non-polar nature

What is the electronegativity difference between hydrogen and phosphorus in PH3?

• 2.20 for hydrogen and 2.19 for phosphorus

• 2.20 for hydrogen and 3.04 for phosphorus

• 2.19 for hydrogen and 2.20 for phosphorus

• 3.04 for hydrogen and 2.19 for phosphorus

What is the boiling point of NH3?

• -33.3°C

• 100°C

• -87.7°C

• 0°C

What is the boiling point of PH3?

• 100°C

• -87.7°C

• -33.3°C

• 0°C

Why does NH3 have a higher boiling point than PH3?

• Because NH3 is non-polar

• Due to the higher electronegativity of nitrogen

• Because PH3 is more electronegative

• Due to the lower electronegativity of hydrogen

Which molecule has a lower boiling point, NH3 or PH3?

• NH3

• Neither has a boiling point

• PH3

• Both have the same boiling point