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Chapter 2 Blog:  The Chemical Basis of Life I (Kathryn)

Page history last edited by Kathryn Addabbo 13 years, 9 months ago

A.  Daily Blog


9/3/10: Our first day of lecture was fun. We started off class by participating in polls using our cell phones. I liked using the cell phones because it was more interactive. After, we went over the structure of an atom, isotopes, and the different bonds that can be made between atoms. An atom consists of two parts, a nucleus (protons and neutrons), and electrons orbiting around the nucleus. These electrons make the atom stable or unstable. If the valence shell is full, that means the atom is stable.

      With these electrons, three types of bonds can be made; hydrogen, covalent, and ionic. Covalent bonds are the strongest, while hydrogen bonds are the weakest. Isotopes are atoms that include equal amounts of protons and electrons, but a different amount of neutrons. Some isotopes are radioactive, meaning the nucleus decays and gives off particles and energy. 


9/8/10: We finished discussing the different types of bonds an atom can make, including hydrogen. We discussed briefly about hydrophobic interaction. Also discussed were the properties of water, and how it is unique from other liquid-like substances. Some unique properties of water include adhesion, cohesion, absorption and surface tension. After, the class talked about the difference between hydrophilic and hydrophobic molecules. Hydrophobic, like the name, are afraid of water, and will repel it on their surface. An well known example is a phospholipid bilayer. Hydrophilic are water loving molecules, they interact freely. Along with that, we discussed the interactions between salt and water. We also dissected the subject of molarity further. 


B.  Useful Materials


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This video shows examples of ionic and covalent bonding. When sodium and chlorine combine, sodium is stripped of its one valence electron, and becomes positively charged. Therefore, chlorine gains that electron, and becomes negatively charged. Covalent bonding occurs when neither atom has enough strength to pull electrons from the other's valence shell. So the two atoms share the electron. We learned about the different types of bonds during class.


Radioactive Isotopes in Medicine

This article talks about how the medical field uses radioactive isotopes for different purposes. Isotopes can be used for diagnostic testing, to get pictures of the body in forms we would otherwise not know about. They can also be used for therapy to cure diseases. Examples are cancer, where doctors use chemotherapy and radiation to kill the mutated cells. This applies to the lecture because we observed a picture of a body showing masses of cancer because in the diagnostic scan, the isotopes were more heavily absorbed in those areas than others.


New Microscope Reveals the Shape of Atoms

This article talks about how scientists modified how to view atoms. After observing some examples, they found that the way textbooks refer to  the structure of an electron is true. The electrons form either a dumbbell or spherically shaped, just as theory predicted. 

Comments (3)

Derek Weber said

at 2:27 am on Sep 9, 2010

9/3: Updated. One comment about linking to an article. Include the title of the article and then hyperlink the title to the URL. To do this highlight the title > select insert link > paste the URL.

Derek Weber said

at 11:44 pm on Sep 10, 2010

9/8: Updated. All you need is the journal article to complete the chapter. Please have it added by Monday.

Derek Weber said

at 3:47 am on Sep 16, 2010

9/15: We are missing the journal article. This chapter is incomplete.

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