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1 Dipole Forces Water is a polar molecule. It has an electric dipole strength of p 6-10-30 C-n This is roughly equivalent to a proton and an electron separated by a distance of d 4.101 m (about the radius of a hydrogen atom) In this problem, we will use Coulombs law to compare the force between two protons, a proton and a water molecule, and two water molecules. Use the arrangement of the charges shown in the figure for your calculations. (a) What is the force between two protons separated by a distance of r 0.1 nm? (b) What is the force between a proton and a water molecule separated by a distance of r 0.1 nm? (c) What is te force between two water molecules separated by a distance of r-0.1 nm? (d) Repeat the analysis of parts (a)-(c) for a separation of r 1 nm. (e) Critical Thinking: You should now have six differ- ent numbers. What do they el you? Compare ratios of various pairs of numbers and comment on the relative strength of the interactions (charge-charge, charge-dipole dipole-dipole) and how these depend on distance.
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