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- Why do you suppose Km values are so frequently standardized and published, drawing attention to the value Vmax/2, rather than Vmax itself?Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 0.5 μg Hg/mL, what is the total mass in kilograms of mercury in the lake? (The lake has a surface area of 100.6 mi2 and and average depth of 15 ft.)A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, ethanolamine, pentane, tetrahydrofuran, and dimethyl sulfoxide. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:
- A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of acetone, methyl acetate, carbon tetrachloride, chloroform, and dimethyl sulfoxide. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:A 795-centigram sample of borax was placed in a certain volume of water at 25 degrees celsius. After adding the sample, the graduated cylinder was read at 35 mL, where a rise of 2.7 mL was observed. What is the weight (grams) of sample? What was the initial volume (millimeters) of water? What will be the weight of displaced water in grams? What is the specific gravity of the solid? What will be its specific volume?The density of air is 1.29 grams/L. What is the weight, in kilograms, of a cubic meter (1.00m^3) of air?
- A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, methyl acetate, tetrahydrofuran, and acetone. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:The specific gravity of a patient’s urine sample was measured to be 1.008. Given that the density of water is 1.000g/mL at 48C, what is the density of the urine sample?You are checking the accuracy of a volumetric flask marked 10.00 mL . To calculate the volume of water contained in the flask, you first measure the mass of the empty flask and the mass of the flask filled with water and take the difference. Then, you correct for the buoyancy factor and divide by the density of the water. The result of 8 such measurements is given in the table. Calculate the 95% confidence interval for these measurements with a mean of 10.03.
- Gypsum is the hydrate of calcium sulfate, CaSO4 · 2 H2O. It is the primary material in sheet rock, used to make walls in houses. If you heat 21.05 g of the hydrate and drive off the water, what is the weight of the anhydrous salt remaining? Report your response to the proper degree of certainty and include the correct unit symbol (i.e., g, mL, km, etc.).Calculate the specific volume, α (cm3/gm), using the following equation and the values of constants and conversion factors provided. α = (RT)/p Where R = 2.8704 x 106 erg/gm(˚K), T = 10˚C, and p = 1000 millimars (mb). All of the conversion factors you will need are: 1 mb = 103 dynes/cm2 ˚K = 273˚ + ˚C erg = dyne(cm) a. α = 8.123 x 109 cm3/gm b. α = 8.123 x 102 cm3/gm c. α = 2.8704 x 104 cm3/gm d. α = 2.8704 x 106 cm3/gmA chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of acetone, ethanolamine, carbon tetrachloride, methyl acetate, and pentane. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: Next, the chemist measures the volume of the unknown liquid as 0.940 L and the mass of the unknown liquid as 663. g.