4.5 Intermolecular forces and polarity

Covalent bond is equal sharing of electron. Polar covelent bond is

• unequal sharing of electrons
• different distribution of electrons
• presence of hydrogen bonding
• presence of polar atoms

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

H₂O is polar. Which statement is FALSE?

• Dipole moment is formed
• Partial separation of charges
• Net dipole moment
• Dipole moment cancel out each other

CCl₄ has polar bonds but is a non polar molecule. Why?

• bond polarity exist between atoms
• bond polarity between atoms cancel
• dipole moment exist between atoms in molecule
• difference in EN between C and Cl

Tags

NGSS.HS-PS1-1

HCCl₃ is a polar molecule with polar bonds. Why?

• it has an asymmetrical shape
• bond polarity between atoms cancel
• net dipole moment exist between atoms in molecule
• difference in EN between C and Cl

Tags

NGSS.HS-PS1-1

CO₂ has polar bonds but is a NON POLAR molecule. Why?

• it has an asymmetrical shape
• bond polarity between C and O atoms cancel
• net dipole moment exist between atoms in molecule
• bond polarity exist between C⁺ and O^-

Which of the following is FALSE about intermolecular forces between molecules?

• It is also called London or Van Der Waals forces
• Dipole dipole attraction between molecule
• Also due to instantaneous dipole attraction between molecule
• Must have permanent dipole moment before it can exist

Factors affecting the strength of VDF and boiling point are

• size and charge of molecules
• shape and molar mass of molecule
• shape and surface area of molecule
• shape and polarity of molecule

The following statement is true for hydrogen bonding EXCEPT

• It is a dipole dipole forces of attraction
• Electronegative element like N, O and F must be present
• Hydogen bonding is stronger than covalent bonding
• ESF attraction bet H atom with lone pair electron from N,O,F