Quiz 2 - Intermolecular Forces Flashcards
(50 cards)
Intermolecular Forces are attractive forces _________ molecules.
Between
Intramolecular Forces are forces _________ ________ _________ in a molecule.
Holding atoms together
How many kcal does it take to vaporize 1 mole of water using INTERmolecular Forces?
10 kcal
How many kcal does it take to vaporize 1 mole of O-H bonds in water using INTRAmolecular Forces?
110 kcal
Generally Intermolecular Forces are much __________ than Intramolecular forces.
WEAKER
Intramolecular Forces are mainly ______.
Bonds
What are different ways of measuring Intermolecular Forces?
- Boiling Point
- Melting Point
- ΔHvap
- ΔHfus
- ΔHsub
What are the 2 things that generate Intermolecular Forces?
I) Partial Charge
II) Charge Interactions
Formal Charges = …
Stronger Interactions
Partial Charges = …
Weaker Interactions
What is an example of a Ion-Dipole Interaction?
The hydration of Sodium and Chloride ions in water
Ex. Ion-Dipole Interaction (Sodium & Chloride ions in H2O)
Waters behave as _________ surrounding a central _________ or _________ _____.
Ligands; metal; halogen ion
What are the weak Intermolecular Forces?
- Dipole-Dipole
- Dipole-Induced Dipole
- Instantaneous Dipole-Induced Dipole (London Forces)
Weak Intermolecular Forces are also called…
Van der Waals Forces
Boiling points for non-polar molecules that are considered London Forces have boiling points that increase when…
The more electronegative molecule has a lower boiling point, whereas a less electronegative molecule has a higher boiling point
__________ species give rise to London Dispersion Forces.
Polarizable
London Dispersion Interactions operate in all molecules but are the only ___________ ____________ that occur between ___________ molecules.
Intermolecular Interactions; non-polar
London Forces are also called…
Instantaneous Dipole-Induced Dipole Interactions
London Forces are interactions resulting when a molecule establishes an __________ _________ as a result of ________ __________ produced in a molecule based of _________ _________ _________.
Instantaneous dipole; charge separation; random electron motion
What happens when a London Force molecule gets near another molecule?
When this molecule is near another molecule it can induce a dipole in the 2nd molecule
The arrangement of the dipoles in London Forces will produce an…
Attractive Interaction (+/-)
The larger the molecules, the _________ the number of electrons that can be involved in dispersion interactions.
GREATER
Generally, as the molecular weight increases the strength of London Dispersion Forces _________.
INCREASES
_________ _________ is important in determining the magnitude of London Dispersion Forces.
Molecular Shape
