Intermolecular Forces

What is the weakest kind of intermolecular force?
Van Der Waal
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What is the strongest kind of intermolecular force?
Hydrogen Bonds
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Between which molecules do Van Der Waal's occur?
All molecules
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How is a van der waal force occur?
Instantenous dipole causing induced dipole in neighbouring molecules, causing temporary attraction
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If the molecule is bigger, the Van der Waal force is ...
Greater
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Between which molecules do Dipole-Dipole forces occur?
Only between polar molecules
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How do dipole-dipole forces occur?
Slightly positive hydrogen attracted to slightly negative atom of another molecule
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Between which molecules can hydrogen form a hydrogen bond with?
F, O and N
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How do hydrogen bonds occur?
Very electronegative atoms has lone pair of electrons - hydrogen becomes bonded - gives molecule a strong overall dipole
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Why is a strong overall dipole achieved during hydrogen bonding?
Large difference in the electronegativity of the atoms
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What are three things to include when drawing a hydrogen bond diagram?
Straight dotted line for bond, show all lone pairs and include all partial charges
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What is the general trend in group 4, for the boiling points of hydrides?
Molecules get larger, have more electrons, greater VDW forces
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Why do H2O, HF and NH3 have large boiling points?
All have hydrogen bonding - strongest kind of intermolecular forces
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Why does H2O have higher boiling point than HF and NH3?
Oxygen is more electronegative than fluorine and nitrogen
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Why do G4 have lowest boiling points?
Only contain VDW forces as non of the molecules are polar
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What bonds exist between the water molecules in ice?
Hydrogen bonds
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What happens to the water molecules as the water cools?
Number of hydrogen bonds increases
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Why does ice have a lower density than water?
Molecules held further apart - held in a 3D lattice
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Other cards in this set

Card 2

Front

Hydrogen Bonds

Back

What is the strongest kind of intermolecular force?

Card 3

Front

All molecules

Back

Preview of the back of card 3

Card 4

Front

Instantenous dipole causing induced dipole in neighbouring molecules, causing temporary attraction

Back

Preview of the back of card 4

Card 5

Front

Greater

Back

Preview of the back of card 5
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