Polarity and Electronegativity of PH3

The video explores the polarity of phosphorus trihydride (PH3). It begins by examining the phosphorus-hydrogen bond, noting the negligible difference in electronegativity, which makes the bond non-polar. However, the molecular geometry, influenced by a lone pair of electrons, results in a trigonal pyramidal shape, making PH3 a polar molecule. The video compares PH3 with ammonia, highlighting that ammonia is more polar due to nitrogen's higher electronegativity. Despite the non-polar bonds, PH3 is a polar molecule due to its geometry.

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

• 0.01

• 0.10

• 1.00

• 2.00

Why is the phosphorus-hydrogen bond in PH3 considered non-polar?

• Because there is no significant electronegativity difference

• Because phosphorus is more electronegative than hydrogen

• Because they form ionic bonds

• Because hydrogen is more electronegative than phosphorus

What is the molecular geometry of PH3?

• Trigonal pyramidal

• Trigonal planar

• Tetrahedral

• Linear

How does the lone pair on phosphorus affect the geometry of PH3?

• It pushes the hydrogen atoms closer together

• It has no effect on the geometry

• It makes the molecule linear

• It creates a trigonal pyramidal shape

Which molecule is more polar, PH3 or ammonia, and why?

• PH3, because it has more hydrogen atoms

• Ammonia, because nitrogen is more electronegative than phosphorus

• Ammonia, because it has a linear shape

• PH3, because it has a higher electronegativity difference

What is the main reason for the polarity of PH3?

• The linear shape of the molecule

• The ionic bonds between phosphorus and hydrogen

• The high electronegativity of hydrogen

• The presence of a lone pair on phosphorus

How does the electronegativity of nitrogen in ammonia compare to phosphorus in PH3?

• Nitrogen is less electronegative

• They have the same electronegativity

• Phosphorus is more electronegative

• Nitrogen is more electronegative

What is the effect of the lone pair on the dipole moment of PH3?

• It decreases the dipole moment

• It increases the dipole moment

• It has no effect on the dipole moment

• It reverses the dipole moment

Despite having non-polar bonds, why is PH3 considered a polar molecule?

• Because hydrogen is more electronegative

• Due to ionic bonding

• Because of the lone pair on phosphorus

• Due to its linear shape

What is the overall conclusion about the polarity of PH3?

• PH3 is non-polar due to its symmetrical shape

• PH3 is polar because of ionic bonds

• PH3 is polar due to the lone pair on phosphorus

• PH3 is non-polar because of non-polar bonds