Back
Problem 1
What is the balanced nuclear equation for the alpha decay of plutonium-238? (a)(b) (c) (d) Problem 4
Fluorine-18 undergoes positron emission with a half-life of 1.10 x 10^2 minutes. If a patient is given a 250 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 75 mg? (a) 56 minutes (b) 96 minutes (c) 132 minutes (d) 191 minutesProblem 6
In a cave in Oregon, archaeologists found bones, plant remains, and fossilized feces. DNA remaining in the feces indi-cates their human origin but not their age. To date the remains, the decay rate was measured and found to be 2.71 disinte-grations/min per gram of carbon. Currently living organisms have a decay rate of 15.3 disintegrations/min per gram of carbon, and the half-life of 14C is 5715 years. How old are the remains? (a) 1460 years (b) 9900 years (c) 14300 years (d) 18600 yearsProblem 7
Calculate the binding energy a uranium-235 nucleus in units of MeV/nucleon. The mass of an 235U atom is 235.043 929, the mass of a proton is 1.007 28, the mass of a neutron is 1.008 67, and the mass of an electron is 5.486 x 10^-4. (1 MeV = 1.60 x 10^-13 J) (a) 2.84 MeV/nucleon (b) 1.70 x 10^3 MeV/nucleon (c) 11.3 MeV/nucleon (d) 7.62 MeV/nucleonProblem 8
Identify the true statement about nuclear power plants and nuclear weapons. (a) Nuclear power plants and nuclear weapons both use uranium enriched to about 90% U-235. (b) Nuclear power plants emit large amounts of CO2 just like coal burning power plants. (c) The United States produces less than 1% of its electrical power from nuclear energy. (d) A nuclear weapon explodes when two pieces of fission-able uranium-235 are pushed together to reach a critical mass.Problem 9
How much energy in kJ/mol is released by the fission of uranium-235 to form barium-140 and krypton-93? The atomic masses are(a) 6.59 x 10^9 kJ/mol (b) 1.66 x 10^10 kJ/mol (c) 1.98 x 10^11 kJ/mol (d) 1.66 x 10^16 kJ/mol Problem 20.31d
Complete and balance the following nuclear equations.
(d) <ISOTOPE CHEM REACTION>
Problem 20.36d
Write balanced nuclear equations for the following processes.
(d) Positron emission of 165Ta
Problem 25
Isotope A decays to isotope E through the following series of steps, in which the products of the individual decay events are themselves radioactive and undergo further decay until a stable nucleus is ultimately reached. Two kinds of processes are represented, one by the shorter arrows pointing right and the other by the longer arrows pointing left. (b) Identify and write the symbolfor each isotope in the series: 
Problem 26
Positron emission and electron capture both give a product nucleus whose atomic number is 1 less than the starting nucleus. Explain.Problem 27
What is the difference between an a particle and a helium atom?Problem 28
Why does beta emission raise the atomic number of the product while positron emission lowers. the atomic number?Problem 29
Why does gamma emission not change the atomic number of the product?Problem 30a
Complete and balance the following nuclear equations. (a)
Problem 30b
Complete and balance the following nuclear equations. (b)
Problem 30d
Complete and balance the following nuclear equations. (d)
Problem 31a
Complete and balance the following nuclear equations. (a)
Problem 31b
Complete and balance the following nuclear equations. (b)
Problem 32
What particle is produced by the decay of thorium-214 to radium-210?Problem 33
What particle is produced by the decay of uranium-239 to neptunium-239?Problem 34a
What particle is produced in each of the following decay reactions? (a)
Problem 34b
What particle is produced in each of the following decay reactions? (b)
Problem 34c
What particle is produced in each of the following decay reactions? (c)
Problem 35a
What particle is produced in each of the following decay reactions? (a)
Problem 35b
What particle is produced in each of the following decay reactions? (b)
Problem 35c
What particle is produced in each of the following decay reactions? (c)
Problem 36a
Write balanced nuclear equations for the following processes. (a) Alpha emission of 162Re
Problem 36b
Write balanced nuclear equations for the following processes. (b) Electron capture of 138Sm
Problem 36c
Write balanced nuclear equations for the following processes. (c) Beta emission of 188W
Problem 37a
Write balanced nuclear equations for the following processes. (a) Beta emission of 157Eu
