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Problem- Archaeologists removed some charcoal from a Native American campfire, burned it in O2, and bubbled the CO2 formed into a Ca(OH)2 solution (limewater). The CaCO3 that precipitated was filtered and dried. If 4.58 g of the CaCO3 had a radioactivity of 3.2 disintegrations/min, how long ago was the campfire?
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Using the Dry Cell or Leclanche cell Diagram. Please write the half reactions (reactions at Anode and Cathode) and net redox reaction and explain the diagram
Calculate the gas NH3 in ppm over NH4OH solution.The density of the solution is 0.9g/ml and the Commercial concentrated aqueous ammonia is 29%.
Explain which has the highest vapor pressure. 20g (c6H12O6) glucose, 20g (C12H22O11) sucrose 10 g (KC2H3O2 potassium
Calculate the pH of a buffer solution made by mixing 49 ml of a 0.07 M ammonia solution with 52 ml of a 0.10 M ammonium nitrate solution. Give the pH to two decimal places.
Explain what is the molar solubility of AgCl in 1.0 M K2S2O3 if the complex ion Ag(S2O3)23- forms. The Ksp for AgCl is 1.8 *10(-10) and the Kf for Ag(S2O3)23- is 2.9*1013.
Explain a gaseous fuel mixture stored at 747 mmHg as well as 298 K contains only methane and propane. While 11.3 L of this fuel mixture is burned, it produces 766 kJ of heat.
What are the rules of giving the IUPAC name and the common name of Aromatic Hydrocarbons with 1, 2 and 3 substituent
Some copper compounds emit green light when they are heated in a flame. how would you determine whether the light is of one wavelength or a mixture two or more wavelengths
The U.S. Food and Drug Administration lists dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) among the many chlorinated organic compounds that are carcinogenic (cancer-causing).
What mass of limestone (in kg) would be required to completely neutralize a 15.3 billion-liter lake that is 1.9×10^-5 M in H2SO4 and 8.9×10^-6 M in HNO3
Using a sample of 350. mL air is collected at 35 Celsius has a pressure of 550. torr. if it is allowed to expand to 425 mL at 57 Celsius then What pressure will the air exert?
reaction does k decrease over time what about in a 0 and 1 st order reaction. In a second order reaction does the half life increase over time what about in a 0 and 1 st order reaction?
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