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Unformatted text preview: Intermolecular Forces and Liquids and Solids 8 c:::=:: =v CHM12 Ion-induced dipole interaction EXERCISES:
What type of IMF can be observed on the following molecules? c:::=::=vc:::=:: =v Dipole-induced dipole
interaction 4.. Hydrogen Bond: a special type of dipole-dipole interaction between
hydrogen atom in a polar bond and an electronegative atom (0, N, F)
• For this to occur H should be attached to a small, highly
electronegative molecule such as N, 0, F. ••
H-OI'" H-OI'" H-OI
I I H 5. 1. H IONS -7 ionic bonding Ion-dipole EEORDONO ~
WITH H bonded to O,F,N
H bonding Strong IMF results to high surface tension.
Water has a greater surface tension than most other liquids.
Molecules must break IMF in order to move to the surface and
increase surface area. •
• NON POLAR COMPOUNDS -7 London forces WITH IONS Explains why droplets are spherical.
It is caused by IMF which is larger in the bulk of fluid than at the
surface • FORCE OF ATTRACTION POLtR MOLECULES SURFACE TENSION: amount of energy required to stretch or increase the
surface of a liquid by a unit area. •
• < H-bonding < ion - dipole < ionic bonding SUMMARY OF INTERMOLECULAR C02 •
• STRENGTHS OF IMF
London < dipole-dipole 6. NH3
10. HCI HF PROPERTIES OF LIQUIDS I H 1. 2. HBr
4. F2 • WITHOUT HYDROGEN
dipole - dipole 2. What happens to surface tension if soap is added?
Types of Capillary action: Cohesion and Adhesion. What is the
difference betWeen the two?
VISCOSITY: measure of a fluid's resistance to flow.
• the greater the viscosity, the slower the liquid flows •
• Viscosity decreases when temperature increases.
Strong IMF results to higher viscosity. Page 2 ...
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