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To analyze the Cu(NO3)2 in an experiment we constructed a plot of absorbance vs. concentratio, commonly called a calibratioin curve. The absorbance at the top of the peak (i.e., at the wavelenght of maximum absorbance) was chosen for these measurements. What is the potential advantage of using the wavelength of maxiumum abosrbance, rather than some other wavelength? Can you think of a situation in which you might want to choose a different wavelenght?
A 45-g piece of ice at 0 degree C is added to a sample of water at 8 degrees C. All of the ice melts and the temperature of the water decreases to 0 degree C. How many grams of water were there in the sample
a seed crystal of diameter d mm is placed in a solution ofdissolved salt and new crystals are observed to form at a
Write the net ionic equation for the following reactions: a. The precipitation of manganese (II) hydroxide b. The reaction that occurs when sodium fluoride is added to a solution containing iron
What is the equilibrium constant expression for the following reaction- C5H5NH(aq) + H2O(l) ? C5H5NH2+(aq) + OH-(aq)
The maximum kinetic energy observed for these electrons is 1.488 x 10?19 J/electron. What is the wavelength of a laser which will turn the photocell on and cause electrons to be ejected which have absolutely no excess energy
Under a given set of conditions, benzene C6H6 (b.p. 80°C) has a retention time of 60 seconds using a GC column. Under these same conditions, would you expect the retention time of toluene C7H8
Equal molar quantities of two gases, O2 and H2O, are confined in a closed vessel at constant temperature. Which gas, if any, has the greater partial presure
2 l of 7 m concentrated hf solution is placed into a 10 lcontainer. the container is sealed and the air is evacuated.
Calculate ?Srxn for the following reaction. The S for each species is shown below the reaction. 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) 192.8 205.2 210.8 188.8 S(j\J/mol*K)
A 500-liter tank contains air at pressure 300 kPa and temperature 500K. Calculate the mass of the air in the tank
When a 5.00 L flask containing 1.35 atm of gas A is joined with a 2.00 L flask containing 1.00 atm of gas B, and the stopcock between the flasks is opened, and the gases are allowed to mix thoroughly at constant temperature
Name those that have a trisubstituted ring where the methyl gorups are oriented Ortho for 3 different isomers.
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