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# Chemistry Ch 1

Question | Answer |
---|---|

What did Max Planck do? | Developed the first quantum theory, proposed that energy is emitted from matter as electromagnetic radiation in discrete bundles called quanta. |

What is the equation derived by Planck? | E=hf, where h is planck's constant 6.626 x 10^-34 Js, f is the frequency of radiation. |

What are Bohr's assumptions about a hydrogen atom? | That it is a central proton and an electron traveling in circular orbit, and that the centripetal force on the electron is the electrical force between the proton and electron. |

How does Bohr use Planck's quantum theory to correct older assumptions about electrons? | He placed restrictions on the value of the angular momentum of the electron revolving around the hydrogen nucleus. He predicted that the angular momentum of an electron is quantized according to L=nh/2π. |

What is the electron energy equation derived by Bohr? | E=-Rh/n^2 (rh is the Rydberg constant, 2.18x10^-18 J/electron). |

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