CHEM151_Lab_07 - GenChem Week 7 Today's Agenda: Review...

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GenChem Week 7 Absorption Spectroscopy Today’s Agenda: ± Review understanding of chemical toxicity. ± Develop understanding of absorption spectroscopy. ± Develop the day’s problem. ± Perform the first challenge: identify the dye in the sample. ± Perform the second challenge: determine molar absorptivity for the dye. ± Perform the third challenge: prepare samples for analysis ± Perform the fourth challenge: determine dye content of sample.
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GenChem Chemicals and the environment.
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GenChem Let s think! In your groups: ± Based on what you have heard from the media, make a list of the dangers posed by chemicals. ± Make a list of chemicals you think are toxic.
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GenChem Consider a chemical with the following properties: ± It is a major component of acid rain. ± It is a green house gas which significantly contributes to “global warming". ± As a gas it can cause severe burns. ± It is a major cause of farmland erosion. ± It accelerates the corrosion and rusting of many metals. ± It can cause electrical failures and decrease the effectiveness of automobile brakes. ± In 2000, more than 409,000 people died due to lethal exposure to this chemical. What is it? Dihydrogen Monoxide
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GenChem What about chemicals makes them dangerous? 1. Their chemical properties. 2. The amounts.
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GenChem The hazardous properties of chemicals are best summarized by the NFPA chemical safety placard required on all shipments of hazardous chemicals.
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GenChem The importance of amounts is reflected in the use of the term “lethal dose”. The most commonly used measure of lethality is the LD 50
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GenChem Material LD50 (mg/kg) subject, route sucrose (cane sugar) 29700 rat, oral sodium bicarbonate (baking soda) 4220 rat, oral sodium chloride (table salt) 3000 rat, oral ethanol (grain alcohol) 2080 rat, oral caffeine 192 rat, oral sodium cyanide 6.4 rat, oral sarin (nerve agent) 24 human, skin contact VX (nerve agent) 0.14 human, skin contact
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GenChem For most chemicals, the most critical question is “how much”?
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This note was uploaded on 06/11/2008 for the course CHEM 151 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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CHEM151_Lab_07 - GenChem Week 7 Today's Agenda: Review...

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