Water Molecule Quiz

What is the approximate angle between two hydrogen-oxygen bonds in water?

• 90°

• 102°

• 105°

• 120°

The bond between oxygen and hydrogen in a water molecule is

• ionic

• hydrogen

• polar-covalent

• dipole-dipole

The molecular geometry of a water molecule is

• linear

• bent

• trigonal planar

• triangular

Liquid water forms molecular groups. How many molecules of water are there in each group?

• one to two

• two to four

• three to six

• four to eight

If water molecules were not linked by hydrogen bonds to form groups in liquid water, what would be the physical state of water at room temperature?

• solid

• liquid

• gas

• a mixture of liquid and gas

What is the reason for the relatively low density of ice?

• empty spaces between molecules

• the high number of hydrogen bonds

• the small size of hydrogen and oxygen atoms

• the low molar mass of water

Compared with nonpolar substances of comparable molecular mass, water’s molar enthalpy of vaporization is

• higher.

• lower.

• similar.

• equal.

Water’s relatively high boiling point is the result of

• covalent bonding.

• hydrogen bonding.

• ionic bonding.

• London forces.

The molar enthalpy of fusion of ice is

• approximately the same as the enthalpy of many other solids.

• larger than the enthalpy of many other solids.

• smaller than the enthalpy of many other solids.

Compared with the boiling point of nonpolar substances of comparable molar mass at 1 atm, the boiling point of water at 1 atm is

• higher.

• lower.

• equal.

• approximately the same.