Chem Homework

1. A cation exchange resin in the acid form can be represented RSO3H. Water containing a lot of sodium chloride is passed through the resin (contained in a ion exchanger). a) Show the reaction that would occur. b) Would you expect the conductivity of the water to change? If so, how? c) Would you expect the pH of the water to change? If so, how? 2. A anion exchange resin in the basic form can be represented RNOH. If combined with a cation exchange resin in the acid form, the ion exchanger is called a mixed bed resin. Water containing a lot of sodium chloride is passed through the resin (contained in a ion exchanger). a) Show the reaction(s) that would occur. b) Would you expect the conductivity of the water to change? If so, how? c) Would you expect the pH of the water to change? If so, how? 6. Uranium has a fuel cycle that includes the front end (mining, milling, conversion, enrichment) and a back end (reprocessing and disposition). Describe 2 minerals that contain uranium showing the formula of the minerals. For one of the minerals you discovered use chemical equations for describing conversions. Describe what enrichment is, why it is necessary, and at least 2 methods that can accomplish it. 7. Fission is statistical, and many possible outcomes (products) can occur. For U 235 describe at least 3 induced reactions (fission) that can occur. Discuss what is meant by the cross section for fission of U235. 8. For any 1 reaction in #7, use E = mc2 to calculate how much energy could be produced by the fission reaction. Calculate the energy in J/atom; J/g; and J/mol. 9. Oklo is an area in Africa that is the site of an ancient natural fission reactor. The ratio of abundance of U 235/ U238 has changed over time. What was the ratio at the time Oklo was active and what is in now. Explain how it is thought that enough fissionable material came to be concentrated enough to become critical. The residuals (products) have been studied extensively and many have used it to conclude what we could do with radioactive waste. Explain.