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u1ohnotes18f2005

u1ohnotes18f2005 - Unit 1 Introduction to Chemistry...

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Unit 1: Introduction to Chemistry Internet web site: www.unit5.org/christjs/ Safety #1 Rule: Use common sense. Others: No horseplay. No unauthorized experiments. Handle chemicals/glassware with respect. Safety Features of the Lab shower fire blanket fire extinguisher eye wash fume hood circuit breaker switch Material Safety Data Sheet (MSDS) -- gives info about a chemical. -- lists Dos and Don’ts; emergency procedures
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2 Chemical Exposure acute exposure vs. chronic exposure damage occurs after damage occurs after a one-time event long-term, repeated exposure e.g., reaction to drugs e.g., smoking; or medication asbestos LD 50 : lethal dosage for 50% of creatures that the chemical is tested on Example: Chemical A: LD 50 = 3.2 mg/kg Chemical B: LD 50 = 48 mg/kg Chemical A is more toxic; it takes less to inflict damage.
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Science The Functions of Science pure science vs. applied science the search for knowledge; using knowledge in a facts practical way e.g., aluminum strong lightweight good conductor Science attempts to establish cause-effect relationships . risk-benefit analysis : weigh pros and cons before deciding How does scientific knowledge advance? 1. curiosity 2. good observations 3. determination 4. persistence
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4 The Scientific Method ** Key: Be a good observer. ** 1. Identify an unknown. 2. Make a hypothesis : a reasonable explanation -- must be testable 3. Repeatedly experiment to test hypothesis.
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