Question

Which compound would you expect to have greater surface tension, acetone [(CH3)2CO] or water (H20)? Explain.
es)
A)
Acetone. This molecule has more instances of hydrogen bonding then
water
B)
Water. Surface tension increases with increasing intermolecular forces, and
water can hydrogen bond while acetone cannot.
Acetone. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but acetone molecules are larger creating
stronger London dispersion forces.
Water. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but water molecules due to their shape, can
pack more tightly and stick together easier.
D

Answer 1

Surface tension increases by increasing the intermolecular forces. In the given compounds water
has the hydrogen bonding interactions along with dispersion forces and dipole-dipole forces,
these hydrogen bonding interactions are not observed in the acetone which has only dispersion
and dipole-dipole forces.
Hence water has the greater surface tension than acetone.

Answer 2

Surface tension increases by increasing the intermolecular forces.

The following information should be considered:

• In the compounds water contains the hydrogen bonding interactions along with dispersion forces.
• These hydrogen bonding interactions are not seen in the acetone which has only dispersion
• So, water has the greater surface tension as compared to acetone.

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