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Chem Lab Terms

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Chelate   show
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complexometric titration   show
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show a way to determine the contents of a substance quantitatively.  
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displacement titration   show
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Lewis acid   show
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show electron pair donors  
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show an atom or group of atoms bound to whatever atom you are interested in  
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monodentate ligand   show
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show binds to the metal ligand through more than one ligand atom  
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Aliquot   show
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aliquot factor   show
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analyte   show
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analytical concentration   show
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equilibrium concentration   show
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show m/v  
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show moles solute/ L solution  
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molecular weight   show
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show weight solute/ mL sample  
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show identifying what is in an unknown  
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quantitative analysis   show
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gravimetric analysis   show
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analytical balance   show
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buret   show
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show drying agent in dessicator  
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show closed chamber containing drying agent—to keep samples dried  
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direct weighing   show
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show absorbs/ attracts moisture from air  
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show weigh by difference—do not weigh onto balance  
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show curvature of liquid caused by surface tension  
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show used to transfer known amount of liquid- can go to 4 s.f.  
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show 0 a balance  
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top-loading balance   show
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show calibrated to contain certain vol of liquid at 20 degrees celcius when bottom of meniscus in in the right spot  
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parallax error   show
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show difference between delivered and desired volume  
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determinate error   show
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indeterminate error   show
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precision   show
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degrees of freedom   show
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confidence interval   show
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show characterized by a mean and standard deviation—mean is center of distribution and standard deviation is width→ (bell shaped curve)  
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show statistical tool used to express confidence intervals and to compare results from different experiments  
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show most useful quantitity for chemical analysis (A)—higher the absorbance  
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show graph showing how A (or epsilon) varies with wavelength Beer's law→  
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show absorbance at one wavelength is plotted against different concentrations in a series of standards  
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show cell which has flate  
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molar absorptivity→   show
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spectrophotometry→   show
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transmittance →   show
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wavelength→→   show
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Aliquot   show
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aliquot factor   show
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show substance that is undergoing analysis (substance being measured)  
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analytical concentration   show
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show the actual concentration  
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density   show
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molarity   show
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show molar mass ( mass of a molecule) calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula  
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weight percent   show
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show identifying what is in an unknown  
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quantitative analysis   show
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show mass of product is measured to determine how much unknown was present  
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show measure to 4 decimal places  
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show used to titrate  
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desiccant   show
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desiccator   show
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direct weighing   show
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show absorbs/ attracts moisture from air  
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indirect weighing   show
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meniscus   show
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show used to transfer known amount of liquid- can go to 4 s.f.  
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tare   show
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show measures to 2 decimal places  
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show calibrated to contain certain vol of liquid at 20 degrees celcius when bottom of meniscus in in the right spot  
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show error that occurs when your eye is not at the same height as the meniscus  
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accuracy   show
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show repeatable if measurement made same way (correctable)  
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indeterminate error   show
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show reproducibility of replicate deliveries  
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show (Absolute uncertainty/magnitude of measurement)  
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show measurement of how close measurements are to each other  
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systematic error   show
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show (n-1)  
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show range of values in which there is a specified probability of finding the true mean  
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Gaussian distribution   show
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standard devation   show
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relative standard deviation   show
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show pooled standard deviation to make use of multiple sets of data  
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Grubbs test   show
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show ratio of the departure of an estimated parameter from its notional value and its standard error  
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show tells you if you can reject or accept your null hypothesis  
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show to test if variances from two things are equal  
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show statistical tool used to express confidence intervals and to compare results from different experiments  
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show square of the standard deviation  
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back titration   show
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blank titration   show
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show sudden change in physical property of solution  
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equivalence point   show
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indicator   show
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primary standard   show
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show solution containing known quantity of analyte  
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standardization   show
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titrant   show
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titration   show
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titration error   show
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show volume of known reagent required for complete reaction with analyte by a known reaction is measured  
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indicator error   show
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show acid  
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KHP   show
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Na2CO3 and THAM   show
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Kjeldahl Nitrogen determination   show
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show the solid is digested in boiling sulfuric acid to convert nitrogen into ammonium  
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show compound containing a ligand (typically organic) bonded to a central metal atom at two or more points  
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show for of volumetric analysis in which the formation of a colored complex is used to indicate the endpoint of a titration  
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direct titration   show
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displacement titration   show
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indirect titration   show
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formation constant   show
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show electron pair acceptor  
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show electron pair donors  
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Ligand   show
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show prevents impurities from reacting with the precipitant  
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monodentate ligand   show
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show binds to the metal ligand through more than one ligand atom  
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adsorption indicator   show
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show titrations iinvolving Ag+  
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Fajans titration   show
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show determination of a chloride by precipitation titration with silver nitrate  
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Vollhard titration   show
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show when a reducing analyte is titrated wIth iodine  
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show titration Of iodine produced when oxidizing analyte is added to excess I-  
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show most useful quantitity for chemical analysis (A)—higher the absorbance  
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show graph showing how A (or epsilon) varies with wavelength  
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Beer's law   show
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calibration curve   show
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show cell which has flate  
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show symbolized by epsilon  
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show the use of electromagnetic radiation to measure chemical concentrations  
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show the fraction of incident light that passes through a sample TEquals(P/Po)  
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wavelength   show
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