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Chapter 6: 4-5

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The Wave Nature of Light

Chapter 6: 4-5 Homework

Reading Preparation

Textbook assignment: Read Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 6 Sections 4 to 5.

Study Notes

6.4 DeBroglie's equation, wavelength = h/p = h/mv, links the wave and particle properties of an object with mass m traveling at velocity v.

6.5 Heisenberg's uncertainty principle shows that we cannot know both the location and velocity of a an electron. Shrödinger's wave equation can tell us the probability that an electron with specific characteristics lies within a given volume of space, but it can't tell us where in the space the electron is. The characteristics are defined by the four quantum numbers, n (energy level), l (angular momentum), m (magnetic orientation), and s (spin).

Important Equations and Conversion Factors

de Broglie Wave Equation λ   =   h mv λ: wavelength
m: mass
v: velocity
Quantum numbers n = 1, 2, 3, ....
l = 0, 1, 2 ... n - 1
ml = -l, ... -2, -1, 0, 1, 2, ... +l
ms = ± ½
n: energy level
l: orbital angular momentum (orbital shape)
ml: magnetic quantum number (orientation of orbital)
ms: electron spin

Web Lecture

Read the following weblecture before chat: Atomic Spectra

Study Activity

Videos for Chapter 6: The Structure of Atoms

Review the Videos at Thinkwell Video Lessons.

  • Under "MODERN ATOMIC THEORY: Electromagnetic Radiation and the Idea of Quantum"
    • The Heisenberg Uncertainty Principle
Simulation Activity

Use the simulation activity below to fire lightbeams of different energy levels at different molecules. Observe

  • how light affects the orientation or motion of the entire molecule
  • how light affects the bonds between atoms in the molecule

Chat Preparation Activities

Chapter Quiz

Lab Work

LAB #4 GUIDED INQUIRY: Measuring reaction rates for photosensitive reactions -- Phase II

Carry out the iodine-oxalate reaction and use your standard set of concentrations to estimate reaction concentration levels at regular intervals. Record concentrations and note when your reaction reaches equilibrium.