Kemiztree
Sunday, May 15, 2011
Wednesday, March 30, 2011
Nuclear Chemistry in conjunction with Cancer Patients
When many people think of a treatment for cancer, their minds immediately jump to chemotherapy. Although rooted deeply in chemistry concepts, another treatment is very interconnected with nuclear chemistry. To learn more about this radiation therapy, view my prezi by clicking here.
Sunday, January 23, 2011
Molecular geometries that you see everyday!
Everyday items may indeed have shapes similar to the molecular geometries of certain covalent compounds. Below are some examples:
There are several "linear" objects that we can see in a single day. A pencil, for example - or even your body when standing straight up.
"Bent" geometries are a bit harder to find. I noticed that my lamp, which has adjustable joints, can form a stick-and-ball model of a "bent" molecular geometry.
One of the most difficult to find, in my opinion, would definitely have been the "trigonal pyramidal." I noticed that a foldable stool illustrates the idea of three bonds and one lone pair quite nicely.
If you go driving, you may notice a Mercedes on the streets. This is where I found an example of the "trigonal planar" geometry. The logo itself is drawn via connecting the vertices of a triangle inscribed in a circle.
Finally, a "tetrahedrally" shaped item can be easily located by any photographer. One of their main tools, the tripod, forms this shape almost perfectly. In fact, when the tripod is un-extended, it could fall under the trigonal pyramidal category.
Attributions:
Linear Geometry Picture:
http://toxicopoeia.com/main/pics/3d_structure_linear.jpg
Pencil:
http://www.wpclipart.com/education/supplies/pencils/pencils_2/wooden_pencil_horizontal.png
Bent Geometry Picture:
http://0.tqn.com/d/chemistry/1/0/8/u/bentgeometry.jpg
Lamp:
http://www.potterybarn.com/products/newbury-halo-task-floor-lamp/?pkey=e%7Clamp%7C86%7Cbest%7C0%7C1%7C24%7C%7C16&cm_src=PRODUCTSEARCH||NoFacet-_-NoFacet-_-NoMerchRules-_-
Trigonal Pyramidal Picture:
http://img.freebase.com/api/trans/image_thumb/m/02fj9jd?errorid=%2Ffreebase%2Fno_image_png&maxheight=200&mode=fit&maxwidth=150
Foldable stool:
http://image.made-in-china.com/2f0j00TutEzhQqjaJk/Aluminium-Foldable-Stool-with-3-Legs-DD2013-.jpg
Trigonal Planar Picture:
http://0.tqn.com/d/chemistry/1/0/6/u/trigonalplanargeometry.jpg
Mercedes Logo:
http://www.smartphotoshop.com/images/merc_14.jpg
Tetrahedral Picture:
http://0.tqn.com/d/chemistry/1/0/B/u/tetrahedralgeometry.jpg
Tripod:
http://www.tnsdistribution.com/aerlingus/ftpimages/large/12.jpg
There are several "linear" objects that we can see in a single day. A pencil, for example - or even your body when standing straight up.
"Bent" geometries are a bit harder to find. I noticed that my lamp, which has adjustable joints, can form a stick-and-ball model of a "bent" molecular geometry.
One of the most difficult to find, in my opinion, would definitely have been the "trigonal pyramidal." I noticed that a foldable stool illustrates the idea of three bonds and one lone pair quite nicely.
If you go driving, you may notice a Mercedes on the streets. This is where I found an example of the "trigonal planar" geometry. The logo itself is drawn via connecting the vertices of a triangle inscribed in a circle.
Finally, a "tetrahedrally" shaped item can be easily located by any photographer. One of their main tools, the tripod, forms this shape almost perfectly. In fact, when the tripod is un-extended, it could fall under the trigonal pyramidal category.
Attributions:
Linear Geometry Picture:
http://toxicopoeia.com/main/pics/3d_structure_linear.jpg
Pencil:
http://www.wpclipart.com/education/supplies/pencils/pencils_2/wooden_pencil_horizontal.png
Bent Geometry Picture:
http://0.tqn.com/d/chemistry/1/0/8/u/bentgeometry.jpg
Lamp:
http://www.potterybarn.com/products/newbury-halo-task-floor-lamp/?pkey=e%7Clamp%7C86%7Cbest%7C0%7C1%7C24%7C%7C16&cm_src=PRODUCTSEARCH||NoFacet-_-NoFacet-_-NoMerchRules-_-
Trigonal Pyramidal Picture:
http://img.freebase.com/api/trans/image_thumb/m/02fj9jd?errorid=%2Ffreebase%2Fno_image_png&maxheight=200&mode=fit&maxwidth=150
Foldable stool:
http://image.made-in-china.com/2f0j00TutEzhQqjaJk/Aluminium-Foldable-Stool-with-3-Legs-DD2013-.jpg
Trigonal Planar Picture:
http://0.tqn.com/d/chemistry/1/0/6/u/trigonalplanargeometry.jpg
Mercedes Logo:
http://www.smartphotoshop.com/images/merc_14.jpg
Tetrahedral Picture:
http://0.tqn.com/d/chemistry/1/0/B/u/tetrahedralgeometry.jpg
Tripod:
http://www.tnsdistribution.com/aerlingus/ftpimages/large/12.jpg
An Electron-ic Poem
How and why we're shared
To minimize repulsion
And form the octet
Why are covalent bonds formed, you may ask? Since atoms aim to have the electron configuration like those of the most stable noble gases, said atoms must attain eight valence electrons (except for hydrogen, which only needs two). By sharing electrons with other atoms (in other words, forming a covalent bond), the atoms can make their orbitals overlap so as to have the eight valence electrons. The minimization of repulsion is evident in the different molecular geometries that covalent compounds emulate. For example, in a tetrahedral form (4 bonded pairs, no lone pairs [on the central atom]), the bonded atoms each move 109.5ยบ away from another, ensuring the least amount of repulsion from the electrons possible. In essence, this haiku states two of the main principles of behavior that are followed by electrons when a covalent compound is formed.
Tuesday, December 7, 2010
Did I really just swallow that?
On the ingredients list of the now-decipherable Centrum Multivitamin/Multimineral Supplement, I ran into some ionic compounds that were understandable. All ten listed below were on said ingredients list; it really is a multi-ionic compound supplement!
1) calcium carbonate
2) magnesium oxide
3) potassium chloride
4) cupric [copper (II)] sulfate
5) manganese sulfate
a) manganese (II) sulfate
b) manganese (III) sulfate
6) nickelous [nickel (II)] sulfate
7) zinc oxide
8) stannous [tin (II)] chloride
9) potassium iodide
10) sodium selenate
1) calcium carbonate
2) magnesium oxide
3) potassium chloride
4) cupric [copper (II)] sulfate
5) manganese sulfate
a) manganese (II) sulfate
b) manganese (III) sulfate
6) nickelous [nickel (II)] sulfate
7) zinc oxide
8) stannous [tin (II)] chloride
9) potassium iodide
10) sodium selenate
You can find ten more examples on my partner's blog. Click here
Tuesday, November 9, 2010
Test Review: #3
3. Looking at the trend in first ionization energies across period 3, there is a sudden unusual dip with Al and S. Explain this.
Well, at first we look at this problem and say what, this doesn't make sense. Ionization energy is supposed to increase across periods, not drop! Well, there just so happens to be an anomaly in this all too perfect trend. To better understand this question, look at the visual display of first IEs below.
Also, to take a look at another representation, click here
Now, what the problem is asking for is this: why does IE drop from Mg to Al and P to S (you can ignore Si)?
Well, the answer in a nutshell is that it is a matter of stability. Look at the orbital filling diagrams below:
Well, at first we look at this problem and say what, this doesn't make sense. Ionization energy is supposed to increase across periods, not drop! Well, there just so happens to be an anomaly in this all too perfect trend. To better understand this question, look at the visual display of first IEs below.
Also, to take a look at another representation, click here
Now, what the problem is asking for is this: why does IE drop from Mg to Al and P to S (you can ignore Si)?
Well, the answer in a nutshell is that it is a matter of stability. Look at the orbital filling diagrams below:
Sunday, October 3, 2010
The Discovery of the Neutron
We have already talked about the discovery of the electron by J. J. Thompson. However, today, we will be talking about the discovery of the neutron, by James Chadwick. So I hope you're ready because this is quite the experiment. Click on the link if you dare to proceed into the world where physics meets chemistry, but first, read what is below: The Discovery of the Neutron
Click More and then Fullscreen to see the Prezi. To advance through the slides, press the Play button.
All numbers in parentheses seen near or around something (not in circles, but rather parentheses) are denotations of footnotes. The citations of these are at the end, in the slide entitled bibliography.
Click More and then Fullscreen to see the Prezi. To advance through the slides, press the Play button.
All numbers in parentheses seen near or around something (not in circles, but rather parentheses) are denotations of footnotes. The citations of these are at the end, in the slide entitled bibliography.
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