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Determine the minimum wavelength of light necessary to overcome the work function of the following metals
Silicon Carbide (SiC) is a ceramic material with the so-called zinc blende crystal structure. It can be constructed from the FCC unit cell using a two-atom basis consisting of a Si atom at (0,0,0) a
A 20 mg sample of a compound is dissolved in 5.0 ml of water and extracted with 2.5 mL of heptane.After separation of the layers, the heptane layer is found to contain 15 mg of the compound. What is
If the partition coefficients for the DCM/water and DCM/bicarbonate systems were different, what was the reason
Assume an organic compound has a partition coefficient between water and diethyl ether equal to 9.00. If there are initially 5.00 grams of the compound dissolved in 100.0 mL of water,
If all of the below solutions are 0.5M in each of the compounds, what is the concentration (M) of each ion in solution
an ethanol-water mixture is to be flash distilled at 1 atm. if the feed is 25 mole % ethanol, what are the liquid and vapor compositions if
What is the half-life of bismuth-210 if 11.7 days are required for the activity of a sample of bismuth-210 to fall to 19.8 percent of its original value
Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). The half-life of nitrogen-13 is 10.0 minutes. How much time is required for the activity of a sam
Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The half-life of iodine-131 is 8.04 days. If you begin with 49.8 mg of this isotope, what mass remains aft
List all the ionic species present (before any reaction occurs) when the following solutions are mixed together
Give the empirical formula of the following compound if a sample contains 11.6g of iron and 5.01g of Oxygen
what ion is the base in this reaction. What is the acid? What is the spectator ion in this rxn? Please be detailed and and show the states
When naming subsittuents on a branched alkane. If dimethyl and and isopropyl branch end up both being off the same number carbon which of these is listed first
Your job is to use the stock solution to prepare 4 solutions with concentrations of 10 ppm, 5 ppm 2.5 ppm and 1.0 ppm. Describe how you would make these four solutions and show all calculations.
A sample of aspirin to be purified has a mass of 1.0g. Aspirin has a solubility of 1.0g in 30ml of water at 37Celcius and a solubilty if 0.10g per 30 ml at 25 Celsius. The sample is dissolved in 30
write equations showing how acetaminophen might be extracted from an organic solvent such as an ether, if it were soluble.
Assuming complete dissociation, what is the molality of an aqueous solution of KBr whose freezing point is -2.95 degrees celsius . water freezing point 1.86
write equations showing how caffeine could be extracted from an organic solvent and subsequently isolated.
What is the mass (in kg) of helium if it filled a square room if the room has walls that are 9.5 feet high and 9.5 long and the density of helium is 0.18 g/L
What is the mass (in g) of a cube of aluminum (density = 2.702 g/mL) with an edge length of 0.27 feet
What is the length (in cm) of an edge of a cube of lead (density = 11.3 g/mL) which has a mass of 20.87 lb
When 20.0 g of a metal is placed in 9.0 mL of water, the volume increases to 14.5 mL. What is the density of the metal
The density of octane is 0.703 g/mL. What mass (in g) will a 0.996 gallon sample of octane have
The density of gold is 19.3 g/mL. What volume (in mL) will a 0.728 lb sample of gold occupy