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.
Help!
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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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