CHE_106_Lecture2_2009

CHE_106_Lecture2_2009 - Chemistry 106 Lecture 2 Topics:...

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Chemistry 106 Lecture 2 Topics: Introduction to Chemistry ath Skills Math Skills Chapter 1.1 – 1.3 Appendix A.1
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Announcements • One recitation has changed location. New location: Tuesday (M040) 5:00-5:55 Link 371 • The Final Examination is on a TUESDAY (Dec. 15, 12:30-2:30PM), not on a Monday. Bring your iClickers next week. • If you did not get a CHE 106 or CHE 107 syllabus, get one after class.
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What is Chemistry? • Chemistry is the study of the composition, structure, and properties of matter and energy and changes that matter undergoes. – Matter is anything that occupies space and has mass. – Energy is the “ability to do work.”
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What is Chemistry? This study of matter and the changes it undergoes can be s simple as as simple as understanding the phase transitions of water (H 2 O).
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Modern Chemistry: Materials Liquid crystals are partially ordered. Model of a molecule that forms a liquid crystal Liquid-crystal display (LCD) in a watch
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Cisplatin: platinum-containing anti-cancer drug adenine (A) thymine (T) Biochemistry Deoxyribonucleic acid (DNA) cytosine (C) guanine (G) Medicinal Chemistry
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Modern Chemistry: Space Crab Nebula (remains of a supernova) hydrogen gas or H 2 We know what atoms and molecules are present in distant objects because of the light emitted and absorbed by them. This is called spectroscopy .
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h On August 16, 2009 , NASA announced they discovered the molecule glycine in a comet! h Glycine is an amino acid and a fundamental building block of proteins (building block of life). comet “Wild 2” Modern Chemistry: Space h The spacecraft collected only 40 nanograms (40 x 10 -9 grams). h Grain of sand weighs >1000 times more. h It took 2 years to analyze the data! “Stardust” spacecraft http://www.nasa.gov/mission_pages/stardust/news/stardust_amino_acid.html
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Glycine = C 2 H 5 NO 2 Modern Chemistry: Space Tracks of embedded comet particles, NASA. How do scientists know that it is extraterrestrial glycine and not contamination from Earth? They measured the atomic isotopes contained in the sample. Space carbon has more carbon-13 while Earth carbon has more carbon-12 .
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Experiment and Explanation Experiment and explanation are the heart of chemical research. – An experiment is an observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained. – After a series of experiments, a researcher may see some relationship or pattern in the results.
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Experiment and Explanation • If the pattern or relationship is fundamental and we can state it simply, we call it a law . – A law is a concise statement or
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This note was uploaded on 02/09/2010 for the course CHE CHE 106 taught by Professor Korter during the Fall '09 term at Syracuse.

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CHE_106_Lecture2_2009 - Chemistry 106 Lecture 2 Topics:...

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