Iodine has many isotopes, but only iodine-127 is stable and is found in nature. one
radioactive iodine isotope, i-108, decays by alpha particle emission. iodine-131 is also radioactive and has many important medical uses.
82 determine the number of neutrons in an atom of i-127. [1]
83 explain, in terms of protons and neutrons, why i-127 and i-131 are different isotopes of iodine. [1]
85 determine the total time required for an 80.0-gram sampleof i-131 to decay until only 1.25 grams of the sample remains unchanged. [1]

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

Name the intersection of plane bpq and plane cpq.