CHEM 320 Lecture 1: lecture 1 notes
24 Aug 2016
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Pay attention to sampling: how many samples, sites , make sure to take representative samples. Sample preparation: make your sample suitable for analysis by ensuring the appropriate conditions such as: How to pick your technique of choice: qualitative (do i have something?) vs. quantitative (how much of something do i have?, when determining an unknown: How to interpret data: use statistics and critical analysis. Conclusion and communication: be able to logically communicate your data, sometimes to a non-expert. You cannot express a number with more precision than which we made the measurement. Sig fig rules: analytical balances measure to 0. 0001 g a 10. 00 ml volumetric pipet is accurate to 0. 02 ml: addition and subtraction: In your answer match the smallest number of places past the decimal. 5. 02 + 6. 7 = 11. 7: insignificant figure is sometimes carried to reduce rounding errors. 5. 02 + 6. 7 = 11. 72: multiplication and division. Report the smallest number of sig figs in your answer.
