Homework

# The Wave Nature of Light

## Chapter 6: 4-5 Homework

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. ShrÃ¶dinger'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

PrincipleFormulaNotes
de Broglie Wave Equation 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

#### 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

• Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
• Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.

#### Chapter Quiz

• There is no chapter quiz YET.

#### 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.

References:

• IGHCE Lab 17.1 Photochemical Reaction of Iodine and Oxalate
• HSCMK IX-1: Photochemical Reaction of Iodine and Oxalate]
• APGIE Investigation 2: How Can Color Be Used to Determine the Mass Percent of Copper in Brass?
• No Alternative Lab exists for this exercise.