When a CFC is broken down, the chlorine generated is a free radical, which has an unpaired electron and is highly reactive. It is sometimes shown as Cl. This chlorine can react with ozone by the following reaction CI + 03 > CIO + 02 The CIO is also highly reactive and can itself react with an oxygen free radical in the atmosphere: 0 + CIO → CI + 02 After these two reactions occur, a chlorine-free radical is regenerated. What can it then do in the atmosphere? Why are chlorofluorocarbons so damaging because of this?

Radioactive gold 198 is used in the diagnosis of liver problems. The half-life of the isotope is 2.70 days. If you begin with a 5.6 mg sample of the isotope, how much of the sample remains after 3.00 days?

Consider the radioisotope ²³⁵U (half life = 7.04 × 10⁸ years). What is the first order rate constant for ²³⁵U?

Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a sample of 8.0 mg of the isotope, how much of this sample remains after 2.8 days? mg

(#27) Reaction rates and decay. Tungsten undergoes first order decay to yield its isotope, with all reaction components in gaseous form. The initial concentration is 1.00 M and the rate constant at 45 degrees Celcius is 6.94 x 10 6/minute. (27a) What is the final concentration of the reactant remaining after 120 days? Type-in your answer inblank#1. The unit is Molarity but enter only the value of your answer in normal numerals (without symbols of unit and no digit or space fillers) with four significant figures. (276) Calculate the percentage amount of the original reactant that has decomposed from the above decay. Type-in your answer in Blank #2. The unit is % but enter only the value of your answer in normal numerals (without symbols of unit) with four significant figures.

The isotope 9038Sr3890Sr is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 y. Calculate the half-life.

[References] Use the References to access important values if needed for this question. The half-life of the radioactive isotope phosphorus-32 is 14.3 days. How long will it take for the mass of a sample of phosphorus-32 to decay from 61.3 micrograms to 15.3 micrograms? days

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Discuss the mechanism by which CFCs and related compounds destroy the ozone layer. What chemical bond in the CFC is critical in this mechanism?

You wish to carry out an investigation that involves the use of a CONDUCTIVITY METER to monitor the rate of a chemical reaction. Which of the reactions below would be the LEAST suitable for this? Select one: a. Ba2+(aq) + SO42-(aq)  → BaSO4(s) b. S2O32-(aq) + 2H+(aq) → SO2(g) + S(s) + H2O(l) c. POCl3(l) + 3H2O(l) → 4H+(aq) + 3Cl-(aq) + H2PO4-(aq) d. 2H2O2(aq) → 2H2O(l) + O2(g)