intermolecular forces (gaya antarmolekul)

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Intermolecular forces

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Overview

attraction in molecules

intramolecular bonds

intermolecular forces

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Intermolecular forces is much weaker than intramolecular forces

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INTERMOLECULAR FORCES ---- attraction that exist between molecule

1. GAYA VAN DER WAALS

• GAYA DIPOLE-DIPOLE• GAYA LONDON (DISPERSI)

2. IKATAN HIDROGEN

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1. Gaya dipole-dipole....dipole-dipole force2. Gaya london (dispersi)....dispersion force4. Ikatan hidrogen......hydrogen bonding5. Ikatan ionik....ionic bonding6. Jaringan ikatan kovalen.....covalent network

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What should be discussed :1. What ?2. When?3. Example?4. Power?

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London dispersion force

•The attraction between atoms and molecules caused by the formation of instantaneous atoms in the atoms and molecules

•Two non polar molecule

•Caused by momentary dipole


polarizability

• the ease with which an atom or molecule can

be distorted to have an instantaneous dipole.


Polarizability increases with: greater number of electrons

Dispersion forces usually increase with molar mass.

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Effects on boiling points

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Dipole-dipole force

• The force that exist between negative and positive ends of a polar molecule.

• Between two polar molecule

+ +- -

Opposite attraction


Hydrogen bonding

• A form of dipole attraction in which hydrogen atom bonded to a strongly electronegative atom

• H + F, O, N .... HF, NH3, H2O• Works like dipole-dipole but 5 times stronger


Ionic bonding

• The forces holding ions together in ionic solids are electrostatic forces


•100 % covalent bond

•There are no intermolecular force

•Only compounds of C only (diamond, graphite)

and Si (usually with Oxygen)

• very strong attraction

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power

Jaringan ikatan kovalen > Ikatan ionik > Ikatan hidrogen > dipol-dipol > gaya london

Apr 10, 2023

intermolecular forces (gaya antarmolekul)

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