greatest inventors and mathematicians of all time. The principle we used in this experiment was discovered when Archimedes stepped into a full bath tub. Using Archimedes principle‚ we were able to determine the density of a lead rod‚ water‚ and an unknown liquid. Physical Data: Name | MW (g/mol) | ρ (g/cm3) | bp (˚C) | mp (˚C) | water | 18.01 g/mol | 1 g/cm3 | 100 ˚C | 0 ˚C | lead | 207.2 g/mol | 11.34 g/cm3 | 1749˚C | 327.5˚C | Equations: Spring ConstantF=-kxThe equation was used to
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point) Positive c. Unknown 1 (1 point)Negative d. Unknown 2 (1 point)Negative e. Unknown 3 (1 point)Negative f. Unknown 4 (1 point)Positive 3. List whether each of the following substances was positive or negative for starch‚ as indicated by using iodine. (7 points) a. Onion juice (1 point) Negative b. Water (1 point) Negative c. Cornstarch (1 point) Positive d. Unknown 1 (1 point) Negative e. Unknown 2 (1 point)Positive f. Unknown 3 (1 point)Negative g. Unknown 4 (1 point)Negative
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The purpose of this lab is to identify the physical and chemical properties of four liquids: acetone‚ vinegar‚ hydrogen peroxide‚ and oil. By using our knowledge about the four liquids we needed to identify the components of an unknown mixture. Theoretical Background The liquids commonly found around the house such as acetone‚ vinegar‚ hydrogen peroxide‚ and oil was tested to identify the physical and chemical properties of these liquids. Acetone usually used as nail polish remover dissolves plastic
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our experiment‚ we test several unknowns. To identify our unknowns we have to compare our spectrums to a known sample. From the 2 unknown samples‚ we cleaned the surface of the sample area and used powder into the IR. Our sample was added to the center of the platform and let the data collect for about a minute. We knew the sample was ready when the spectra appeared on the screen. We used the computer to perform the instrument operations yielding us with 2 unknowns. To analyze our spectra‚ we printed
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bacteria can use citrate as a source of carbon. To test if the unknown bacteria uses citrate as a source of carbon‚ Simmon’s citrate agar was used as the medium on which the bacteria was grown. The Simmon’s citrate agar consists of sodium citrate as the source of carbon‚ ammonium dihydrogen phosphate as the source of nitrogen along with pH indicator such as bromothymol blue. Procedure: The Citratase activity was detected by inoculating the unknown bacteria on the slant surface of Simmon’s citrate agar
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in the compound are excluded from the crystal lattice. After obtaining the pure compound‚ a melting point determination procedure can be done using a mel-temp device to correctly identify the compound if its identity is unknown. In this experiment‚ the identity of a given unknown organic solid will be discovered using the methods of recrystallization and melting point determination. Safety Information • Be sure to add a boiling chip to any liquid before heating it. • Always wear department approved
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to separate and purify two unknown compounds‚ one solid and one liquid‚ from an ethereal solution using the techniques of chemically active extraction‚ vacuum filtration‚ simple distillation‚ and recrystallization. Then identifying information was compiled about these unknowns by obtaining experimental melting/boiling point ranges‚ and analyzing IR and proton/carbon NMR spectrums It was determined that the unknown solid’s identity was m-nitrobenzoic acid and the unknown liquid’s identity was 4‚4-dimethyl-2-pentanone
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investigated the boiling point of an unknown liquid to determine its identity. Chemical Responsibility: 1. Make sure to use glycerine (lubricant) and a towel to safely insert the thermometer into the rubber stopper. 2. Carefully operate the Bunsen burner and make sure to use rubber gloves when handling the boiling water of beaker 3. Always wear goggles at all times and avoid contact with the unknown liquids 4. After the lab is done‚ pour the unknown liquid into a container labeled “Waster
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identify unknown bacteria cultures using various differential tests‚ and my unknown bacteria is #17. The identification of these unknown cultures was accomplished by separating and differentiating possible bacteria based on specific biochemical characteristics. Whether the tests performed identified specific enzymatic reactions or metabolic pathways‚ each was used in a way to help recognize those specifics and identify the unknown cultures. The differential tests used to identify the unknown cultures
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Introduction The purpose of this experiment was to find the identity of the unknown compound #12. This was done both qualitatively and quantitatively. The qualitative observations were used to determine the functional group that was in the unknown‚ the quantitative results were used to determine the molar mass through Duma’s method. The types of compounds that were used in testing were all functional groups‚ Aldehyde‚ Ketone‚ Alcohol and‚ Ester. Functional groups are a portion of a molecule that
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