CHEM 112 Lecture Notes - Lecture 14: London Dispersion Force, Electronegativity, Surface Tension

• School: UMASS-Amherst
• Department: Chemistry
• Course: CHEM 112
• Professor: Xueying Qin

Document Summary

Net downward force of attraction leads to surface tension. Energy required to break a surface the toughness of the liquids skin leads to spherical water droplets. Addition of soap to water reduces surface tension. Strong imf in water makes it more able to from sphere. Capillary action force between molecule and external devices. Water molecules are attracted to glass surface by hydrogen bond. Some water molecules adhere to glass while others attract other molecules. Strength of imf directly dependent on charge of interacting atoms this is what makes a meniscus qa qb = force r^2. Because imf depends on differing charge, imf is referred to as an electrostatic interaction. This law is used qualitatively, to form relationships between force, charge, and distance. Only partially charged due to differences in electronegativity. Higher electronegativity means bond oscillates are it more in most cases of imf atoms are not formally charged.