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Unformatted text preview: Chem Lab Final Study Guide Experiment #2: Objectives: o Scientific Glassware Glassware marked as TC (to contain) or TD (to deliver) Volumetric flask is used for measurements, NEVER Erlenmeyer flask or beaker Buret is the most precise and accurate instrument, it has a nob that can be turned to start and stop the flow of water Volumetric pipet has a set amount of fluid it can hold Rubber policemen also known as stirring rods Filter flask is like Erlenmeyer but thing sticking out of its side o Precession and Accuracy Error associated with every experiment Accuracy: a result that agrees closely with the true value of a measured quantity Systematic errors generally influence the accuracyof the data Precision: refers to the agreement among a group of experimental results; it implies nothing about their relation to the truevalue Variation in repeated measurements is due torandom error o Systematic (Determinate) Error A consistent error that can be detected and corrected Generally unidirectional with respect to the true value o Random (Indeterminate) Error Error that cannot be attributed to any known cause, but arise from the limitations on our ability to make physical measurements...
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This note was uploaded on 11/04/2009 for the course CHEM 101L taught by Professor Austell during the Spring '08 term at UNC.
- Spring '08