London Dispersion Forces (LDFs) are the weakest intermolecular forces but are present in all molecules. They arise from temporary, instantaneous fluctuations in electron distribution, creating temporary dipoles. These temporary dipoles induce dipoles in neighboring molecules, leading to a weak attraction. The strength of LDFs increases with the size and shape of the molecule (more electrons and larger surface area = stronger LDFs!).
Understanding LDFs is essential for predicting physical properties like boiling point and viscosity. Larger LDFs mean stronger attractions, which lead to higher boiling points.
Match the term with its correct definition:
| Term | Definition |
|---|---|
| 1. Instantaneous Dipole | A. The force of attraction between temporary dipoles in nonpolar molecules. |
| 2. Polarizability | B. A momentary uneven distribution of electrons in a molecule. |
| 3. London Dispersion Forces | C. The ease with which the electron cloud of an atom or molecule can be distorted. |
| 4. Intermolecular Forces | D. Forces of attraction between molecules. |
| 5. Boiling Point | E. The temperature at which a liquid changes to a gas. |
London Dispersion Forces are present in _______ molecules. They arise from _______ fluctuations in electron distribution. The strength of LDFs _______ with increasing molecular size and surface area. Stronger LDFs generally lead to _______ boiling points. These forces are important for understanding the physical _______ of substances.
Explain how the shape of a molecule affects the strength of London Dispersion Forces and provide an example to illustrate your point.
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