Polarity and Intermolecular Forces

Define electronegativity

• ability to donate electron
• tendency to lose electron
• tendency to lose electron to its neighbor
• tendency of atom to attract shared electron to itself

Tags

NGSS.HS-PS1-2

Polarity of a molecule is determined by

• shape and charge
• shape and difference in EN value
• difference in EN value and size
• difference in EN value and charges

Tags

NGSS.HS-PS2-6

The following are requirement for hydrogen bonding EXCEPT

• H atom bonded to electronegative N, O and F
• Electronegative element like N, O and F must be present
• H atom bonded with lone pair electrons from Gp 7
• ESF attraction between H atom with lone pair electron from N,O,F

Tags

NGSS.HS-PS1-1

Why BCI₃ is non polar while NCI₃ is polar?

• BCI₃ is symmetrical and bond polarity exist
• BCI₃ does not have polar bonds, while NCI₃ does
• BCI₃ is asymmetrical and bond polarity exist
• BCI₃ is symmetrical and bond polarity cancel

Tags

NGSS.HS-PS1-2

Arrange the boiling point of molecules (RMM given), from lowest to highest.

• lowest H₂ - N₂ - H₂O - CI₂ highest
• lowest H₂ - H₂O - N₂ - CI₂ highest
• lowest H₂ - N₂ - CI₂ - H₂O highest
• lowest H₂O - N₂ - H₂ - CI₂ highest

Intermolecular forces for: CO₂

• London dispersion Forces

• Dipole dipole

• Hydrogen bonding

Tags

NGSS.HS-PS1-3

The weaker the intermolecular forces of a substance the _____________ the boiling point

• higher

• lower

Tags

NGSS.HS-PS1-3

Does NH₃ or PH₃ have a higher boiling point?

(Hint: identify the types of IMF's present for each)

• NH₃ because it has the strongest IMF's

• PH₃ because it has the strongest IMF's

• NH₃ because it has the weakest IMF's

• PH₃ because it has the weakest IMF's

Tags

NGSS.HS-PS1-3

A molecule is polar when

• it is asymmetrical with at least one polar bond

• it is symmetrical

• it is asymmetrical

• it is symmetrical with at least one polar bond

Use your knowledge and electronegativity sheet to predict what the following compound is classified as.

• nonpolar covalent

• polar covalent

• ionic

• metallic

Tags

NGSS.HS-PS1-1