What is electronegativity?

• The ability of an atom to repel electrons.

• The ability of an atom to attract electrons in a covalent bond.

• The ability of an atom to lose electrons.

• The ability of an atom to form ionic bonds.

Which element is the most electronegative?

• Oxygen

• Nitrogen

• Chlorine

• Fluorine

What happens to electronegativity as you move across a period?

• It remains constant.

• It increases.

• It fluctuates randomly.

• It decreases.

In a polar covalent bond, how are electrons shared?

• Not shared at all.

• Transferred completely to one atom.

• Unequally, with electrons closer to the more electronegative atom.

• Equally between atoms.

What is a dipole moment?

• A measure of the separation of charge in a bond.

• A measure of the bond strength.

• A measure of the number of bonds.

• A measure of the bond length.

Which of the following molecules is non-polar despite having polar bonds?

• Water (H2O)

• Ammonia (NH3)

• Carbon dioxide (CO2)

• Hydrogen chloride (HCl)

Why is water considered a polar molecule?

• Because it has no dipoles.

• Because it has a linear shape.

• Because it has a symmetrical shape.

• Because it has a non-linear shape with dipoles that do not cancel.

Which molecule has a trigonal planar shape and is non-polar?

• Ammonia (NH3)

• Boron trifluoride (BF3)

• Nitrogen trifluoride (NF3)

• Water (H2O)

What is the shape of ammonia (NH3) that makes it polar?

• Trigonal pyramidal

• Trigonal planar

• Tetrahedral

• Linear

In the context of molecular polarity, what does symmetry imply?

• The molecule is always non-polar.

• The molecule is always polar.

• The dipoles reinforce each other, making the molecule polar.

• The dipoles cancel out, making the molecule non-polar.