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you observed that a high dilution of a young culture was plated on a medium known to support its growth, but after 48 hours of incubation, the plate showed no growth. Give two possible explanations for these results.
diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2°. What is the distance between the layers of atoms responsible for the diffraction?
I need help describing an experiment where one could measure the value of the extinction coefficient of a solution with a concentration (c mol/L) of chlorophyll in water for a given wavelength.
What is the pH of a soft drink in which the major buffer ingredients are 6.5 g of NaH2PO4 and 8.5 g of Na2HPO4 per 355 mL of solution?
Imagine that a chemist has cyclohexanone, triphenylphosphine, butyllithium, and 2-bromobutane.
An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 1.20 1019 calcium ions, how many iodide ions does it contain?
If the concentration of Mg2+ ion in seawater is 1350 mg/L, what OH- concentration is required to precipitate Mg(OH)2
Draw the full and complete mechanism for the reduction of a carboxylic acid using H2 over platinum. The product is a primary alcohol. Just use ethanoic acid as your model compound.
At 20 degrees C, the vapor pressure of ethanol is 45 torr and the vapor pressure of methanol is 92 torr. What is the vapor pressure at 20 degrees C of a solution by mixing 27.0 g of methanol and 75.0 g of ethanol?
How does nuclear magnetic resonance imaging allow us to see inside human bodies? In what other ways do you think this technology could be used
A "little more" than 5 mL of a saturated solution of borax is transferred to the corresponding calibrated test tube and subsequently titrated with the standardized hydrochloric acid solution.
the pH of a solution is defined as a measure of its hydrogen ion concentration. which of the following correctly defines the relationship between the pH and the hydrogen ion concentration of a solution
Why do primary alkyl halides typically undergo SN2 substitution reactions more rapidly than do secondary or tertiary alkyl halides?
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