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The potential energy of a particle in a large ring is:

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2 Will HF give lower energy than CISD for the same molecule and basis set?

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Will DFT give lower energy than CISD for the same molecule and basis set?

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In which method the e- density has all the information of the system?

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The Heitler London structure of H2 in VB has a weight of 80%. Therefore:

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In the * of FI, the orbital coefficient will be בסיגמא סטאר

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Knowing that the interaction energy between two alkanes is always smaller in HF compared to CISD, we can say that:

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Which of these is not correct for hydrogen bonds? Electrostatic forces are significant.

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According to Hammond’s postulate:

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Which one of these is not an observable?

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