Your UANet ID: Chemical Thinking U3 MI: Discussion 11 1 A World of Compounds The

Question

Your UANet ID: Chemical Thinking U3 MI: Discussion 11 1 A World of Compounds The line structures of a variety of common organic compounds made of C, H, and O atoms are shown to the right. O HO Determine the types of IMFs between a pair of molecules of each of the species represented above. 1. HO 2. Rank the compounds made of these molecules in order of lowest to highest boiling point. Justify your Intermolecular forces between the molecules of a liquid substance are responsible for a phenomenon known as surface tension, Interactions between molecules at the liquid surface allow it to resist the action of external forces.. The surface tension is typically measured in dynes/cm (force/length). Liquid water has a large surface tension compared to other liquids (72.8 dynes/cm at 20 °C). The surface tensions of different liquid alcohols measured at 20 °C are shown in the table 3. How would you explain the large difference in the surface tension Surface Tension (dynes/cm 22.4 22.1 23.6 24.3 of these liquids compared to that of liquid water? Substance CH,OHI CH,CH OH(U) CH,CH CHOH CH CH,CH CH OH(l) 4. How would you explain the trend in the variation of the surface tension as the molecular length increases

Explanation / Answer

1a-dipole-dipole interaction, b-dipole-dipole interaction,c- hydrogen bonding , d-hydrogen bonding,E&F-Van Der Waals Dipole-dipole interactions.

2-D<C<F<E<B<A

4-surface tention increases with increase in lenth,because increase in lenth of chain increase fluid displacement efficency & air mobility.

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