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Fig. 16-6 Schematic representation of the cubic crystal structure of sodium chloride.

Fig. 16-5 The force between two molecules ( blue curve ) is zero at a separation r = r o , where the potential energy ( red curve ) is a minimum. The force is attractive when the separation is greater than r and repulsive when the separation is less than r o.

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Fig. 16-6 Schematic representation of the cubic crystal structure of sodium chloride.

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  1. Fig. 16-5 The force between two molecules (blue curve) is zero at a separation r = ro, where the potential energy (red curve) is a minimum. The force is attractive when the separation is greater than r and repulsive when the separation is less than ro.

  2. Fig. 16-6 Schematic representation of the cubic crystal structure of sodium chloride.

  3. Fig. 16-8 Elastic collision of a molecule with an idealized container wall. The velocity component parallel to the wall does not change; the component perpendicular to the wall reverses direction. The speed v does not change.

  4. Fig. 16-9 A molecule moving toward the wall with speed vxcollides with the area A during the time interval dt only if it is within a distance vx dt of the wall at the beginning of the interval. All such molecules are contained within a volume Avx dt.

  5. Fig. 16-10 In a time dt a molecule with a radius r will collide with any other molecule within a cylindrical volume of radius 2r and length v dt.

  6. Fig. 16-11 When an amount of heat dQ is added to (a) a constant volume of monatomic ideal gas molecules, (b) the total translational kinetic energy increases by dKtr = dQ, and the temperature increases by dT = dQ / nCv.

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