Objectives: 1. To identify the relative densities of some common liquids and solids. 2. To determine the densities of water‚ an unknown liquid‚ a rubber stopper‚ and an unknown rectangular solid. 3. To determine the thickness of a piece of aluminum foil using the density concept. 4. To practice proficiency in performing the following experimental procedures: pippeting a liquid‚ weighing by difference‚ and determining a volume by displacement. Apparatus: Tall glass cylinder‚ glass marble‚ rubber
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substance observed. Many people use the density of objects to find what it is and how to classify the object. The object of the lab conducted was to find the density of the substances given and to find what the unknown liquid and solid were. The process to finding what the unknown solid and liquid were‚ was to find the density and to conduct multiple trials so when the density is discovered‚ it is possible to compare the density found to another one in order to find the liquid or solid
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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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Objectives 1. To understand how spectrophotometry can be used to determine the concentration of a light-absorbing substance. 2. Learn the procedure for constructing a standard curve and practice using the standard curve to determine concentration of unknown samples. 3. Review graphing and how to determine the equation of a line. Introduction There are many ways to measure the amount of a substance – if we have a relatively large amount‚ such as a spoonful of sugar‚ we can find its mass with a balance
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Procedure: Melting point of RCO2H Before observing the melting point of the unknown sample‚ the melting apparatus had to be standardized with a standard substance having the melting point of 151°C-153°C. After placing a small sample of the standard in a capillary tube and inserting the tube into the sample tube holder‚ the plateau on the device was set to 15°C below the expected melting point. After its temperature reached the plateau‚ the temperature increment was set at 1°C per minute‚ and the
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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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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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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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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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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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