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Molecular Interactions and Bonding

Molecular Interactions and Bonding. The figure shows the potential energy of two interacting atoms. The point with the minimum value is r 0 and the point where the curve crosses 0 is r 1 . Where is the force between the two atoms the largest? . At r 0 . At r 1 .

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Molecular Interactions and Bonding

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  1. Molecular Interactions and Bonding

  2. The figure shows the potential energyof two interacting atoms. The point with the minimum value is r0 and the point where the curve crosses 0 is r1. Where is the force between the two atoms the largest? • At r0. • At r1. • At fairly large values of r. NEXUS/Physics Clicker Questions

  3. The figure shows the potential energyof two interacting atoms. The point with the minimum value is r0 and the point where the curve crosses 0 is r1. Where is the force between the two atoms repulsive? • Between r1 and r0. • Between r1 and ∞. • Nowhere. NEXUS/Physics Clicker Questions

  4. The figure shows the potential energyof two interacting atoms. The point with the minimum value is r0 and the point where the curve crosses 0 is r1. Where is the force between the two atoms attractive? • Between r1 and r0. • Between r1 and ∞. • Nowhere. NEXUS/Physics Clicker Questions

  5. Two atoms interact with a potential energy between them that varies as a function of their separation as shown in the graph at the right. We take the zero of energy to be when they are very far apart and at rest. They have a total energy E1 as shown on the figure. Which of the following statements are true about them? • They are in a bound state. • The total energy of the molecule is positive. • The total energy of the molecule is negative. • The total energy of the molecule is zero. Only A A and B A and C A and D Only B Only C Only D NEXUS/Physics Clicker Questions

  6. Two atoms interact with a potential energy between them that varies as a function of their separation as shown in the graph at the right. We take the zero of energy to be when they are very far apart and at rest. They have a total energy E1 as shown on the figure. Which of the following statements are true about them? • To pull them apart, you would have to put in an energy E1. • To pull them apart, you would have to put in an energy -E1. • By pulling them apart, you would gain an energy E1 that you could use elsewhere. • By pulling them apart, you would gain an energy -E1 that you could use elsewhere. NEXUS/Physics Clicker Questions

  7. What can you say about the average separation between the two atoms when they are in the states shown on the diagram? • When the atoms in the molecule have an energy E1 the atoms are on the average closer together than when they have an energy E2. • When the atoms in the molecule have an energy E2 the atoms are on the average closer together than when they have an energy E1. • In both cases, the atoms are, on the average, the same distance apart.

  8. What can you say about the average motion of the two atoms when they are in the states shown on the diagram? • In both states, the separationbetween the atoms remains fixed. • The atoms change their position more when they are in the state E1thanwhen they are in the state E2. • The atoms change their position more when they are in the state E2 than when they are in the state E1.

  9. The Gauss gun Spheres numbered 1, 2, and 3 all “stick” when added one at a time. Which is more tightly bound? • Sphere 1 (when 2 and 3 are NOT there) • Sphere 3 (when 1 and 2 ARE there) • They will be the same. NEXUS/Physics Clicker Questions

  10. The Gauss gun When sphere 0 is released it is attracted to the magnet and begins to speed up. What do you think will happen when it hits the magnet? • Sphere 0 will stick. Nothing else will happen. • Sphere 3 will be kicked off at the same speed that sphere 0 hit with and will slow down to a stop – reversing what 0 did as it approached. • Something else will happen. (What?) NEXUS/Physics Clicker Questions

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