General Chemistry for Engineers CHEN 1201 - Study Notes class 21

Recitations

  • Responses:

    • A) Yes

    • B) No/ambivalent

General Information

  • Course Title: General Chemistry for Engineers (CHEN 1201)

  • Instructor: Carolyn Kohlmeier

  • Department: Chemical and Biological Engineering

Week 9 Lecture Details

  • Lecture Number: 21

  • Chapters Covered: 8.3, 8.4

  • Contents of Previous Lecture:

    • Light and the electromagnetic spectrum

  • Contents of Current Lecture:

    1. Bohr Model

    2. De Broglie Wavelength

    3. Uncertainty Principle

    4. Probability Distribution

The Bohr Model

  • Definition: A model in atomic theory that describes electron orbits within an atom.

  • Atomic Spectroscopy:

    • Study of electromagnetic radiation absorbed and emitted by atoms.

    • Different atoms emit light at different colors.

    • Emission Spectra: A series of bright lines corresponding to the light emitted by specific elements (e.g., Hg, He, H2).

  • Key Features of the Bohr Model:

    • Electrons (e-) have fixed orbits.

    • Light is emitted when electrons jump between these orbits.

    • Orbits:

    • Defined as stationary states.

    • Energy is quantized, meaning it can only take certain discrete values.

Atomic Energy Spectra Examples

  • Examples of atomic energy spectrum lines from various elements:

    • Hg (Mercury)

    • Li (Lithium)

    • Cd (Cadmium)

    • Sr (Strontium)

    • Ca (Calcium)

    • Na (Sodium)

  • Significance: These emission lines act as