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Is it necessary to use the same solvent to dissolve the sample as is used to develop the tlc plate(TLC)? Why?
Estimate the time it will take to flush 99% of the discharge from the lake. Immediately after the spill, the lake, completely mixed, has a pH of 8 and the total molar concentration of nitrogen species (NH3 and NH4+) is 7.1×10-4 mol/L. what is the ..
17the decomposition of dinitrogen pentaoxide has an activation energy of 102 kj/mol and delta H =+55 kj/mil. What is the activation energy for the reverse reaction
from your understanding of collniative properties how would you design an experiment to measure the freezing point of a
degrees Celsius) is placed in 20.6 g of water at 25.00 degrees Celsius. What is tins specific heat if the equilibrium temperature is 47.75 degrees Celsius?
What is the value of the rate constant. What is the reaction rate when the concentration of NO2(g) is 0.842 M and that of O3(g) is 1.82 M if the temperature is the same as that used to obtain the data shown above
what is the maximum mass of product (oil of wintergreen) that could be formed? The density of methanol is 0.791 g/mL.Give your answer in grams with 3 significant figures.
Why is it important that your distillation apparatus to have a vent to atmospheric pressure and why do you put a boiling chip
Calculate the plate height (H) for a 16 cm-long column with a stationary phase particle diameter
What are the values of the entropy changes (system, surroundings, and universe) for the cooling of 1 mol of O2 (g) from 298 K to O2 (l) at 90.19 K if the process is done a. Reversibly b. Irreversibly by placing the sample in liquid hydrogen at 13...
Solution boiled to remove CO2 and then the excess HClO4 back titrated with 13mL of dilute NaOH. In a seperate experiment 18.44 mL of HClO4 neutralized NaOH in a 16.0 mL portion. Calculate molarities of HClO4 and NaOH
water is a uniqu material in that the density of the solid is lower than the density of the liquid which is why ice
Write the Bronsted-Lowry chemical equation describing how C2H5NH2 behaves when add to water. Indicate whether C2H5NH2 behaves as an acid or a base
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