Molecular Shapes, Polarity and IMF

A covalent bond is the sharing of electrons. A polar covelent bond is the ___.

• 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 an electron to a neighboring atom

• tendency of atom to attract shared electrons

Tags

NGSS.HS-PS1-1

A molecule is polar if it ___.

• has a positive charge

• is unsymmetrical and has polar bonds

• is a very large molecule

• is symmetrical and has polar bonds

H₂O is polar. Which statement is FALSE?

• H2O has polar bonds

• The oxygen has a higher electronegativity than the hydrogens

• H2O is unsymmetrical and has polar bonds

• The hydrogens have a higher electronegativity than the oxygen

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

• It has polar bonds

• The polar bonds cancel each other out due to its shape

• It has non polar bonds

• It has an unsymmetrical shape

HCCl₃ is a polar molecule. Why?

• It has a symmetrical shape.

• The bond polarity between the atoms cancel.

• It has polar bonds and is unsymmetrical in shape.

• There is a large difference between the EN of C and Cl.

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

• It has an asymmetrical shape

• C is more electronegative than O

• The bonds are polar, but they cancel due to its symmetrical shape.

• The bond between C and O is polar

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

• IMFs are stronger than covalent bonds.

• Dipole-dipole IMFs happen between polar molecules.

• All substances have dispersion IMFs.

• Polar compounds generally have stronger IMFs than non polar compounds.

Which factor DOES NOT affect the strength of dispersion IMFs?

• molar mass

• surface area (branching)

• the number of electrons

• polarity

The following statement is true for hydrogen bonding EXCEPT

• Hydrogen bonding is responsible for the high surface tension in water

• Electronegative element like N, O and F must be present

• Hydogen bonding is stronger than covalent bonding

• Hydrogen bonding is the reason why ice floats in liquid water