Author Archive
The Final Exam
The CH141 exam will be on Monday, 12/17 at 1:30 -4:30 PM. We will use the same Keyes first floor classrooms for the exam. You may work for the entire 3 hours, but the exam is expected to take most students 120 min. The exam will cover all class and laboratory materials and we will use the same format as the hour exams. Allowed exam items are pens/pencils and a course-approved calculator. You will be provided with a periodic table and equation sheet. You may bring snacks and a water bottle.
There will be an optional review session on Sunday, 12/16 in Keyes 105 at 4 PM.
There will also be office hours from 1-2pm Monday, 12/10 through Friday, 12/14. On Monday and Tuesday Prof. Madison will be in the Chem Help Center (Keyes 104). On Wednesday through Friday, come to her office (Keyes 314).
Practice exams are posted on our web page. The Final Exam Equation Sheet is available as well.
Making White Light – materials research for a better world
“Incandescent bulbs are one of the most energy-inefficient products in daily use,” Joanna McKittrick says. Touch a regular old 100-W light bulb after it’s been lit for a few minutes, and you’ll see what she means.
Less than 5% of the electrical energy that goes into the tungsten filament inside is converted to visible light, explains McKittrick, a luminescent materials specialist at the University of California, San Diego. The rest is wasted as heat that, should you follow our instructions, will burn your fingers.
Incandescents “basically haven’t changed since Thomas Edison invented them” about 140 years ago, she says.
Discovered via computational screening for new phosphors, this compound (above) is the first member of the previously unknown Sr-Li-Al-O crystal family. Black outline = unit cell. Gold = Sr. Red = Li. Green = Al. Blue = O.
Bulbs that contain light-emitting diodes (LEDs), on the other hand, can produce the same amount of white light but barely feel warm to the touch. That’s because LEDs are more energy efficient. A 15-to-20-W LED can produce the same brightness as a 100-W incandescent, roughly 1,500 lumens. LEDs are also less fragile and can last tens of thousands of hours longer. Nevertheless, these modern alternatives currently account for less than 10% of lighting worldwide, according to data from the U.S. Department of Energy.
more … https://cen.acs.org/materials/inorganic-chemistry/chemical-search-better-white-light/96/i46
Solids and Liquids – Making the Oceanographer Happy
Reading chapters 11 and 13
Intermolecular Forces:
London, dipole-dipole, hydrogen bonding, ion-dipole
Comparison of forces
Properties of Solids, Liquids, and Gases
Phase changes
Heating curves
Resources: hydrogen boding in biological structures, Chapter 11 Images 2018, Chapter 11 Notes, Chapter 13 Slides 2018, Chapter 13 notes
Week XI – Advanced Bonding – King
Reading: Chapter 9
Homework: Please see Mastering Chemistry
Polarity
Molecular Shapes and VSEPR
Bond Strength and Energies
Valence Bond Theory
Molecular Orbitals – Wave Example I, Simple Wave II
Resources: Chapter 9 Slides, Chapter 9 Notes 2018, Chemical Education Molecule Viewer
Why we care about the shapes of Molecules –
Week X – Bonding – King
Reading: Chapter 8
Homework: Please see Mastering Chemistry
Ionic Bonding
Lattice Energies
Covalent Bonding
Lewis Structures
Bond Polarity and Electronegativity
Resources: Chapter 8 notes 2018, Chapter 8 slides
Viewing Molecules: Simple – ethanol, Complex – carbonic anhydrase
Week IX Periodic Trends – King
Reading: Chapter 7
Homework: Please see Mastering Chemistry
Periodic Table
Effective Nuclear Charge
Atom and Ion Size
Ionization Energy
Electron Affinity
Resources: Web Elements , Chapter 7 Notes 2018, Chapter 7 Slides
Week VIII – Atoms (King)
Reading: Chapter 6
Homework: Please see Mastering Chemistry
Light
Energy is Quantized
Line Spectra and the Bohr Model
Wave nature of matter
Atomic Orbitals
Orbital Shapes
Electronic Configurations
Resources: Chapter 6 Images, Bohr, Schrodinger,
King Chapter 6 Notes- A, Bohr Calcs, Uncertianty, King Chapter 6 Notes- B
Second Exam and Review Session
Review session for the second exam is on Tuesday at 8 PM in Keyes 105.
Reminder: Exam 2 is Thursday, Oct. 25! Exam Locations: Keyes 105, 102, 103, and 114.
A practice exam can be found on the “Sample Exams” section of the course website.
Exam information: Exam 2 will be held on Thursday, Oct. 25 from 5:00-7:00 pm. You may work for the entire 2 hours, but the exam is expected to take most students 60 min. The exam will cover the class material from chapters 1-5, 10, 20.1, and 20.2 and laboratory material from experiments 1-6. Read experiment 6 even if you have Friday lab. It is a excellent review of thermochemistry. Allowed exam items are pens/pencils and a course-approved calculator. You will be provided with a periodic table. There will be an optional review session on Tuesday, 10/23 in Keyes 105 at 8 PM.
Equation Sheet for Exam #2: Exam 2 Equations and Constants
Week VI – Gases
Reading: Chapter 10
Lecture Outline:
Pressure
PV=nRT
Using Gas Laws
Partial Pressures
Kinetic Molecular Theory
Effusion and Diffusion
Real Gases
Resources: CO2 in the atmosphere, chapter 10 images, Gas Demo 1 (V vs P) 2016, Gas Simulation, King Chapter 10 Notes 2018,
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