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 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 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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Modern Chemistry: Biology & Medicine 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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head2right On August 16, 2009 , NASA announced they discovered the molecule glycine in a comet! head2right Glycine is an amino acid and a fundamental building block of proteins (building block of life). comet “Wild 2” Modern Chemistry: Space head2right The spacecraft collected only 40 nanograms (40 x 10 -9 grams). head2right Grain of sand weighs >1000 times more. head2right 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 How do scientists know that it is Tracks of embedded comet particles, NASA. 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 mathematical equation about a fundamental relationship or regularity of nature.
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