2311quiz1 2009 - Chemistry 2311, Spring 2009 Student Name _...

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Chemistry 2311, Spring 2009 Student Name ______________________________ Last Name of TA _______________ Quiz #1A (50 pts) 1. Safety, Waste handling, and Standard Lab Techniques In succinct words explain … 12 pts (2 pts each) a. why pipetting directly from a reagent bottle is poor lab technique The pipet and/or rubber bulb used could contain other chemicals which would contaminate the reagent bottle for all others using it. b. why experimental observations should be written directly into a laboratory notebook not on scraps of paper scraps of paper and be lost along with the crucial data. Always write observations directly in the lab notebook c. why a reflux apparatus with heating mantle should not rest directly on the bench top If overheating or a problem occurs, it would be difficult to quickly remove the heating mantle since the whole apparatus would need to be raised. d. how an excess aqueous sodium bicarbonate solution should be handled as waste aq NaHCO 3 can be flushed down the drain with water. (fairly neutral and nontoxic) e. how a hazardous organic solid should be handled as waste (give two ways) Add as a solid to the HAZARDOUS ORGANIC SOLID WASTE or dissolve in acetone and add
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2311quiz1 2009 - Chemistry 2311, Spring 2009 Student Name _...

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