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A new element, setonium, has been isolated and, consistent with some predictions, is nonradioactive. While only nanogram amounts are available, spectroscopic analysis (X-ray photoelectron spectroscopy, etc.) suggests that setonium is in the same family as chromium and will share many of its chemical properties, including most common oxidation state. Preliminary analysis suggests that the air stable form of setonium has a radius of 130 pm. Predict the formula of the form (cation, anion or oxide) in which it would likely be found in a beaker of pH 5.5 to 7 water.
One of the students in lab decided to use two fractionating columns (one on top of the other) instead of just one. How would this a) affect the separation between hexane and heptane?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 57.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 255.0 mL of solution.
Methyl red is an indicator that changes between yellow and red. In solution methyl red (HMR) dissociates as follows:
Calculate the amount of heat required to completely sublime 73.0 g of solid dry ice (CO2 ) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, how many half-lives have passed?
What is the molar solubility of Hg2C2O4 (Ksp = 1.75x10^-13) in 0.34M Hg2(NO3)2
Consider 4 L of a buffer composed of 2 M HCN and 3 M NaCN? How many moles of strong acid could this buffer withstand?
Energy of visible photos and breaking of the bond in AgI, The silver iodine bond energy is approx 255kJ/mol. (AgI is one of the active components in photograpgy sunglasses.)
Cobalt-60 exhibits first order decay and has a half-life of 5.26 years. If it must be replaced in a radiotherapy unit when its radioactivity decreases to 75% of its original value, how long can a 1.00 g sample be employed?
a sample of a gas has a mass og 0.311g. its volume is 0.225 L at a temperature of 55 degrees C and a pressure of 886 mmHg. find its molar mass
One of the alkali metals reacts with oxygen to form a solid white substance. When this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, H2O2.
What is the Vmax of this enzyme when enzyme concentration is equal to 0.2mg/mL? I understand the equation to find kcat is: kcat = Vmax/[E]t however,
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