che106_lecture2

che106_lecture2 - 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 Ø If you missed the last lecture, pick up a syllabus after class. Ø Register for MasteringChemistry Ø Reminder : First Homework and Tutorial sets are due on the MasteringChemistry website by midnight on Friday, September 9th.
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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 Model of a molecule that forms a liquid crystal Liquid-crystal display (LCD) in a watch Liquid crystals are partially ordered.
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Modern Chemistry: Biology & Medicine Deoxyribonucleic acid (DNA) Cisplatin: platinum-containing anti-cancer drug adenine (A) thymine (T) cytosine (C) guanine (G) Biochemistry 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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Ø On August 16, 2009 , NASA announced they discovered the molecule glycine in a comet! Ø Glycine is an amino acid and a fundamental building block of proteins (building block of life). Ø The spacecraft collected only 40 nanograms (40 x 10 -9 grams). Ø Grain of sand weighs >1000 times more. Ø It took 2 years to analyze the data! comet “Wild 2” “Stardust” spacecraft Modern Chemistry: Space 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 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 . Tracks of embedded comet particles, NASA.
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Experiment and Explanation Experimentation 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 10/04/2011 for the course CHE 106 taught by Professor Freedman during the Fall '08 term at Syracuse.

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che106_lecture2 - Chemistry 106 Lecture 2 Topics:...

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