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Write a chemical equation representing the second ionization energy for lithium. Use e- as the symbol for an electron.
Calculate the millimoles of copper (II) sulfate the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
If you purchased 1.11 muCi of sulfur-35, how many disintegrations per second does the sample undergo when it is brand new
A solution is made by dissolving 0.45 moles of LiCl to make 150 mL of aqueous solution. What is the molarity of the solution?
The pH increased from 5.8, the normal pH of a cigarette , to pH 6.4 by addition of ammonia. How many moles of ammonia are required to produce this pH change per cigarette (volume approx. 5ml)?(Assume that no unprotonated ammonia will exist at pH 6..
Recall "living" carbon samples show 15.3 d/min*g (carbon). note: CaCO3 is 12.00% carbon, and 14C has a half-life of 5730yr.
use oxidation number to show which element is oxidized and which element is reduced in this equation 2H2o2----2H2O+O2
The gas pressure in an aerosol can is 1.8 atm at 25 degrees celsius. if the gas is an ideal gas what pressure would develop in the can if it were heated to 475 degrees celsius?
What is the difference between a hypothesis and a theory? a hypothesis is a proposal that has been tested extensively, whereas a theory is an initialy stated proposal a hypothesis is a conclusion made after a theory was tested words hypothesis
NaOH + CO2 -> Na2CO3 + H2O. If the average human body discharges 745 g of CO2 per day, how much NaOH is needed each day for each person in the spacecraft.
Consider one kmol of methane at a pressure of 23.2 bar and a temperature of 200 K. Is this methane an ideal gas? Show or describe how you reached this conclusion
Write a chemical equation describing the condensation process for O2 and a chemical equation describing the freezing process for O2. For each process discuss the change in enthalpy and entropy that occurs.
If the barometric pressure is 741 mmHg, and if h = 53. 0 mm, what is the pressure of the gas, expressed in atm and in kilopascals, if the substance in the tube is mercury having a density of 13.6 g/mL.
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