xercises in OpenStax Chemistry, Ch. 21
Ryan Kilby
CHM/150
June 4, 2017 Week Two Exercises in OpenStax Chemistry, Ch. 21 Chapter Twenty-one
2. Write the following isotopes in nuclide notation e . g . ,} rsub {6} rsup {14} C
)
¿
¿ (a) Oxygen-14
(b) Copper-70
(c) Tantalum-175
(d) Francium-217
10. Which of the following nuclei lie within the band of stability shown in Figure 21.2?
(a) argon-40
(b) oxygen-16
(c) 122Ba
(d) 58Ni
(e) 205Tl
(f) 210Tl
(g) 226Ra
(h) magnesium-24
14. Complete each of the following equations.
(a) 7 Li+? →2 4 He
3
2 (b) 14 C → 14 N +?
6
7 (c) 27 Al + 4 He→ ?+ 1 n
13
2
0 (d) 250 Cm→ ? + 98 Sr + 4 1 n
96
38
0
14 C ⟶ 14 N +? ,if 100.0 g
of carbon reacts, what volume of nitrogen
6
7
) is produced at 273K and 1 atm? 18. For the reaction
gas ( N 2 20. What changes occur to the atomic number and mass of a nucleus during each of the
following decay scenarios?
(a) an α particle is emitted
(b) a β particle is emitted
(c) γ radiation is emitted
(d) a positron is emitted
(e) an electron is captured 32. −6 A 1.00× 10 −g Sample of nobelium, is formed. What is the percentage of 254 No
, has a half-life of 55 seconds after it
102 254 No
remaining at the following times?
102 (a) 5.0 min after it forms
(b) 1.0 h after it forms
7 Be
7 Li
atom (mass = 7.0169 amu) decays into a
atom (mass = 7.0160 amu) by
4
3
electron capture. How much energy (in millions of electron volts, MeV) is produced by this
reaction?
42. A 46. Write a balanced equation for each of the following nuclear reactions: (a) mercury-180 decays into platinum-176
(b) zirconium-90 and an electron are produced by the decay of an unstable nucleus
(c) thorium-232 decays and produces an alpha particle and a radium-228 nucleus, which
decays into actinium-228 by beta decay
(d) neon-19 decays into fluorine-19 Reference
Rice University. (2015). OpenStax College. Retrieved from Rice University, Chemistry website.

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