Marjorie is trying to determine the identity of an unknown substance. after running tests, she determines that the substance is insoluble in ccl4 with a density of about 2.2 g/ml. substance density boiling point solubility (in water) solubility (in ccl4) nacl 2.165 g/ml 1413°c soluble insoluble c10h8 1.14 g/ml 255°c insoluble soluble fecl3 2.898 g/ml 315°c soluble insoluble sio2 2.634 g/ml 2590°c insoluble insoluble using the data above, which of the following substances is most likely marjorie's unknown? a. fecl3 b. nacl c. sio2 d. c10h8

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

All of the following are part of the biosphere except

0.88 moles of n2o5 (g) was placed in a sealed 1.00 l vessel. calculate the equilibrium concentration of n2o5. no2, and o2 and the equilibrium constant after equilibrium has been reached by 65.0% of the n2o5 decomposing.