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In our kinetics lab we used sodium thiosulfate as a mild reducing agent. Explain why this reagent would be a reducing agent? Also, what about potassium dichromate K2Cr2O7? Why is it such a good oxidizing agent?
0.2 M HCl is used to neutralize 20 mL of 0.35 M NaOH. a. How many moles of OH- are present?
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places.
What NaCl concentration results when 289 mL of a 0.680 M NaCl solution is mixed with 457 mL of a 0.330 M NaCl
the red lice in the hydrogen spectrum is caused by the electron moving between which two energe levels? (the ionization energy of a hydroge atom is 2.18X10^-18J)
Ammonia gas at 223°C and 90. atm flows into a reactor at a rate of 550. L/min. Carbon dioxide at 223°C and 47 atm flows into the reactor at a rate of 600. L/min. What mass of urea is produced per minute by this reaction assuming 100% yield?
A sample of material contains contains 20 mg of Iodine ^131. Calculate: A) The number of I ^131 atoms initially present. B) The activity in becquerels and curies.
For a chemical reaction that has a positive delta Ho value and a negative delta So value, under what conditions will the reaction proceed spontaneously toward products
If the actual pressure of the vapour was less than the surrounding , will molecular weight you determine (heptane) be too low or too high
Calculate the heat required to raise the temperature of 125 g of water are heated from 20.0oC to 100oC based on a specific heat of water of 4.184 J/g oC.
"Given the following standard reduction potentials, E°redAl3+/Al = -1.66 V. E°redCr3+/Cr = -0.74 V.
what is the number of grams of C02 produced if you combust 0.50 ole of Ch4 according to the following balanced equation.
a solution contains 10.0g of koh and 900.0ml of water. the volume of the solution is 904.7ml. what is the mass percent
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