This article is highly recommended for reading!
This article is highly recommended for reading!
I’ve made a list of ten reactions I would like all my students to know:-)
Monday April 29th from 2 to 4
Monday May 6th from 1 to 4
These two sessions are reserved for Chem 201 students to prepare for Exam III and the Final.
Areas of the Periodic Table: Alkali Metals, etc.
diamagnetic and paramagnetic
Study Figure 9-9, Figure 9-12, Figure 9-18
Electronegativity: Figure 10-6
Writing Lewis Dot Stuctures for covalent molecules and for polyatomic ions.
Skip 10-6 radicals but learn about expanded valence.
Table 10-1 is very, very important.
single bond is longer than a double bond and a double bond is longer than a triple bond
triple bond is stronger than a double bond which is stronger than a single bond
triple bond means bond order of 3, double bond means bond order of 2, and single bond means bond order of 1
Table 11.1 (memorize)
sigma vs. pi
hybridization for different geometries
12.1 to 12.4 only
I received this email from Mike Davis, VP at Wright College:
Good evening. Forgive the late notice, but I wanted to make sure that
word got out as widely as possible.
On Friday 4/26 Wright College will be hosting an
Undergraduate Research Symposium. The focus of the program is the
Research Experience for Undergraduates (REU). This is an initiative that
is funded by the National Science Foundation (NSF) that seeks to include
undergraduate students in authentic research. REUs are paid positions
that are hosted all over the United States. Community College students
are eligible to apply for these programs, and would benefit greatly from
participating (take it from a former REU!).
The event will feature two panel discussions:
Student Panel – Three students who have
completed undergraduate research will discuss some of their experiences,
including how they got there, what kind of work they did, how it helped them,
and advice for other interested students.
Researcher Panel – Representatives from Hope
College, Northwestern University, and IIT will discuss their REU programs, the
opportunities for community college students, and what it takes to be
successful in these programs.
This will take place at the Wright College Theatre on Friday
April 26th. The program goes from 9:00 – 11:00 with
refreshments being served at 8:30.
Please pass this information on to your students. They
will be able to talk with REU directors and professors, who can give them
advice on applying for future programs.
Interim Vice President
Wilbur Wright College
The quiz tomorrow will cover Lewis Dot structures, geometry and shape of molecules, polar vs. non-polar – very similar to the lab. If you want your graded lab back – stop by today.
I found an excellent power point presentation that explains expanded valence very well. Please take a look…
This has been a cold April and it is still too early to plant most types of seeds – but that doesn’t mean there isn’t a lot to do in the garden. This is a great time to work with your soil – acidify it around the roses, blueberries, rhododendrons and other acid-loving plants, turn it over and aerate it. Add compost to it – build it up in places where it has eroded.
This is also a great time to take some photographs – the before pictures you will use to compare with those taken at the end of the growing season.
This scene looks pretty baren. The hostas are just beginning to show some leaves. The gooseberry bus is budding. The pond water has recently melted. The wisteria looks hopelessly tangled. It will be amazing to see how this small space is transformed over the next three months.
Some of the earliest plants to greet us are the bulbs – tulips, daffodils and other types of bulbs that are planted in the Fall. Having some of these provides some early excitement.
This area is completely brown and lifeless in appearance. Who would guess that honeysuckle is going to take over the fence, forsythia is just about to burst out with yellow flowers and zoysia grass will come to life.
This is the time to haul bags of soil and fill in areas that need work. A few bags every year pays off after a few years. A garden is not developed in one season – it takes time to determine what grows best and in what locations. This will be for corn this year. Last year this same space was for beans. Beans are nitrogen producers and corn is a heavy feeder so I practice this simple crop rotation – corn and beans swap spaces each year. Of course Thor believes this is to be his space for rolling in the dirt. Part of the preparation is the fences that must go around the young plants to protect them.
Walls like this one are easy to build – no mortar needed. The bricks are notched and hold together well. This area lost a lot of soil last year so I decided a wall would help retain the soil better. All those canes will be rasberries. The rasberries began as only two plants – that was two years ago. Look how they have multiplied.
So the early garden is dominated with the colors of the earth – browns of all shades. Spend some time looking at your space while everything is dorment – this is a time to dream…
This is a check list so you can determine if you have the skill set required for the part of the Exam on Tuesday that covers quantum chemistry:
A prepared student should be able to:
1. convert between wavelength and frequency (speed of light is provided: 3.00 X 10E-8)
2. put common areas of the electromagnetic spectra in order (gamma, x-ray etc.)
3. find the energy of a photon or any number of photons (moles of photons for example)
4. Name the scientist and the main idea of the three experiments we talked so much about in class – ultraviolet catastrophe (blackbody radiation), photoelectric effect, atomic emission and absorbtion spectra
5. describe the rules for generating quantum numbers
6. state the Pauli Exclusion Principle and Hund’s Rule
7. determine which combinations of quantum numbers are allowed or forbidden and be able to say why
8. describe the main idea behind each quantum number (size/distance, shape, orientation of orbitals, spin of electron)
9. Discuss wave/particle duality.
This is the basic list and hopefully will cover the main ideas of chapter eight. If you have specific questions – just email me.
You can see the use of the metric system in this antique equipment that was once used to weigh gold.This photograph was taken in Paraty, Brazil.
Thanks to Kiley for sharing this very useful link:
I recommend you give it a try.
Please complete the following handout using the online PhET gas law simulator:
Turn this in by Tuesday, March 12.
Please be sure you can provide definitions for the following terms:
intensive, extensive property
empirical formula versus molecular formula ( what is the difference)
solute, solvent, solution
oxidizing agent, reducing agent
Plus the volcabulary of colloids (chart from wikipedia):
|Medium / Phases||Dispersed phase|
(All gases are mutually miscible)
Examples: fog, mist, hair sprays
Examples: smoke, cloud, air particulates
Example: whipped cream, Shaving cream
Examples: milk, mayonnaise, hand cream
Examples: pigmented ink, blood
Examples: aerogel, styrofoam, pumice
Examples: agar, gelatin, jelly
Example: cranberry glass
I found this amazing photograph in Wikipedia – under Calcium Oxalate:
Scanning Electron Micrograph of the surface of a kidney stone showing tetragonal crystals of Weddellite (calcium oxalate dihydrate) emerging from the amorphous central part of the stone. Horizontal length of the picture represents 0.5 mm of the figured original.
A summary of the oxidation number rules:
Activity series for metals:
Solubility Chart to Complete
Students explored the mechanical advantages and efficiencies of various pulley systems in Physical Science 112 this week.
Pulley systems are describes in mathematical equations such as work in = work out and force=work X distance. Students predict what will happen and then make measurements to determine outcomes.
To construct these systems requires many hands. The discussions were lively as the students shared their observations about what was happening in each system.
There is a certain satisfaction that is experienced when the pulley mechanism is demonstrated to decrease the force required to lift a weight.
Recently I keep hearing “There’s an app for that!” and I have to ask myself – can an “app” help a person develop a real sense of how forces work in the 3D world? In Physical Science 112 the students carry out labs that give them hands-on experience testing and observing the laws of physics.
Here students explore concepts of velocity and acceleration using an air table:
A spark generator will leave a track of dots that can be analyzed carefully to allow precise measurement of position, velocity and acceleration.
Students also examined effects of air resistance by building and testing parachutes:
The goal is to design a parachute that will bring a ball down more slowly than when it is simply dropped.
By carrying out experiments students develop their own intuition about Newton’s Laws of Motion.
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