CHM1045
Fall 2000
Dr. Michael Blaber
Exam #3 Study Guide
Monday November 13 2000
1. General Information:
The exam is worth 100 points and covers chapters 7-8 of your text. There will be 12 questions. The number of points per question is as follows:
|
Question |
Number of points |
|
1 |
6 |
|
2 |
9 |
|
3 |
10 |
|
4 |
6 |
|
5 |
15 |
|
6 |
6 |
|
7 |
6 |
|
8 |
8 |
|
9 |
9 |
|
10 |
8 |
|
11 |
9 |
|
12 |
8 |
2. What to study
You are responsible for all material covered in chapters 7-8, as well as information covered in the lectures. Please pay special attention to the following:
Note: you need to memorize the following equations:
l
* n = c (the relationship between wavelength, frequency and speed of light for electromagnetic radiation)
E = h *
n (the relationship between energy and frequency for electromagnetic radiation
En = -RH / n2 or En = -B / n2 (the relationship between the energy of an electron in Bohr's model of the hydrogen atom, and the orbit number of the electron)
D
Elevel = RH * (1/ni2 - 1/nf2) or En = B * (1/ni2 - 1/nf2) (Energy change associated with an electron transition from one orbit to another in the Bohr model of the hydrogen atom. Note sign on the constant)
l
= h/(mv) (DeBroglie's relationship between momentum (i.e. mass * velocity) and wavelength for a particle.
You will be provided the following:
c (speed of light) = 3 x 108m/s
h (Planck's constant) = 6.63 x 10-34 Js
RH (Rydberg constant) = 2.18 x 10-18J
(Note: this is also known as 'B' or Balmer's constant relating electron energies in the Hydrogen atom)
Mass of electron: 9.11 x 10-31 kg
1 Joule = 1kg m2 s-2
Concepts to focus upon:
- Understand how a charged particle is deflected by either an electrical or magnetic field
- If provided frequency, be able to calculate wavelength for electromagnetic radiation (and vice versa).
- Know where gamma rays, x-rays, u.v., visible, infrared, microwave, television and radio waves are in the e.m. spectrum. Hint: if you memorize wavelengths you can convert to frequencies (and vice versa), so just memorize wavelengths
- Know what wavelengths correspond to what colors in the visible spectrum - red (~700nm), yellow (~600nm), green (~550nm), blue (~475nm) and violet (~400nm)
- Know the relationship between energy, frequency and wavelength for e.m. radiation
- Understand the meaning of amplitude, wavelength and frequency for an e.m. wave
- Know how to calculate the energy of an electron in a Hydrogen (Bohr model) orbit. Know how to calculate the energy difference between orbits, and whether a photon is absorbed or emitted if an electron jumps to a different orbit
- Understand the relationship between wavelength and momentum for a particle (DeBroglie's relationship)
- Know what the different quantum numbers are, and how the names of orbital subshells, and the total number of available orbitals in a subshell, are derived from the values of the quantum numbers.
- Understand how to write electron configurations for an atom or ion. Be able to identify an atom if provided an electron configuration for that atom.
- Know how to fill out an orbital diagram for an atom. Likewise, be able to identify an atom if provided an orbital diagram
- Know how to calculate effective nuclear charge for electrons in a given subshell
- Understand periodic relationships of atomic size, ionization energy and electron affinity
- Understand how atomic radii can be determined from known bond distances between atoms