AP Chemistry Chapter 3 Questions 1. Balance the following nuclear reactions. Write the mass number and atomic number for “?”, as well as the element symbol where possible. a. 54 Fe + 4 He → 2 1 H + ? b. 27 Al + 4 He → 30 P + ? c. 32 S + n → 1 H + ? d. 96 Mo + 2 H → n + ? e. 98 Mo + n → 99 Tc + ? f. 13 C + ? → 14 C g. 40 Ar + ? → 43 K + 1 H 2. The radioactive series that begins with 235U and ends with 207Pb undergoes the sequence of emissions: α , β , α , β , α , α , α , α , β , β , α . Identify the radioisotope produced in each step. 3. Which isotope in each of the following pairs should be the more stable? a. C-12 or C-13 b. N-15 or N-14 c. Si-28 or Si-29 4. Cobalt-60 was involved in the worst radioactive accident in North America. The half-life of the isotope is 5.3 years. Starting with 10.0mg of Co-60, how much will remain after 21.2 years? Approximately how much will remain after a century? 5.
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