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why is natural vanillin ethanolic extract considered to be of higher quality and therefore more expensive than the synthetic vanillin solution in ethanol
If you have a white powder that could be either Epsom salt or table salt, how could you decide which one it is
A gravimetric method for Al was found to give results that are constantly low by 0.70 mg Al. Calculate the parts per thousand error when 750 mg sample containing approximately 12% Al is analyzed by
How could you be certain a peak in the soda was caffeine and not another substance with similar retention time
Describe what data you need to collect and how you will use it to identify the metal cations present in the sparklers.
Consider the following. You identify a line with a wavelength of 503 nm. Describe how you would go about determining which of the lines in table 1 of the experiment guide that it corresponds to.
at 400K and a total pressure of 1.0atm, the mole fraction of H2 is 0.25 and that of I2 is 0.30, in equilibrium with HI. Calculate Kp and Kc for the equilibrium.
chromium crystalizes forming body center cubic unit cell length 280 pm. What is the radius of chromium atom in pm
a 20.0 mL sample of NaIO3 was treated with an acess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. If 19.35 mL, of Na2S2O3 solution were required to reach a strach-iodine end
Calculate the de Broglie wavelength, in nm, of a baseball of 5.25 ounces with a speed of 97.0 mph
What speed would an O2 molecule have if it had the same momentum as a photon of 700 nm wavelength
Work function. A photon with 250 nm wavelength hits an Au surface (work function 5.28 eV). What's the kinetic energy (in eV) of the ejected electron? What's its speed (in km/s and mph)
Sirius, the brightest object on the night sky besides the moon and the larger planets and, is a two-star system. The surface temperature of the larger one (Sirius A) is 9940 K. What's the wavelength
The maximum of the solar emission spectrum is at a wavelength of about 503.0 nm. What is the surface temperature of the sun
An Nd:YAG laser emits photons at 1064 nm in a pulse of 5.0 ns duration with a total energy of 300 mJ. What is the power (energy per time) associated with such a pulse. How many photons are emitted i
One of the vibrational modes (the asymmetry stretch) of the CO2 molecule is at 2349 cm-1. Convert this to eV, nm and K.
What volume of 2.48 M sulfuric acid (in mL) produces 0.334 moles of H+ in the solution? Do not enter units with your answer.
I2+6H2O yields 2IO3-+12H+ where and how many electrons are needed to balance this equation
Write an equilibrium expression for each chemical equation. 1. 2CO(g)+O2(g)===2CO2(g) 2. N2(g)+O2(g)===2NO(g) 3. SbCl5(g)===SbCl3(g)+Cl2(g) 4. CO(g)+Cl2(g)===COCl2(g)
The reaction was allowed to proceed for 15 minutes, and the rate was measured again. What would you predict about the second measured rate relative to the first? The reaction rate would be faster. T
The rate of the reaction will increase if the pressure of the gases increases. The rate of the reaction will remain constant with increasing temperature. The rate of the reaction will increase as ti
The rate of phosphorus pentachloride decomposition is measured at a PCI5 pressure of 0.015 atm and then again at a PCl5 pressure of 0.30 atm. The temperature is identical in both measurements. Which
Consider the reaction: 2H2S(g)==2H2(G)+S2(g) An equilibrium mixture of this reaction at a certain temperature was found to have = [H2S]=0.602 , [H2]= 3.24×10^?2M , and [S2] = 7.84×10^?3
Calculate the amount of isopentyl acetate that should be present in the reaction mixture at equibrium, based on the quantities of starting materials you used and a value of 4.2 for the equilibrium c