Nuclear Chemistry Multiple Choice Test
Click in the appropriate box for each question, then click "Done" at the bottom. 10 marks for each correct answer. Hints cost 5 marks each.
1. In a nuclear reaction: The number of nucleons changes The total charge changes Atoms retain their identities None of the above All of the above
2. Mass is not conserved in a nuclear reaction because:: It is converted to energy It is lost to the surroundings The nucleons have no mass The nucleons react with the electrons Because Einstein said so
3. In a fission reaction, the products are: More massive than the reactants All neutrons Usually two large fragments and a few neutrons Always non-radioactive Always the same
4. A very short half life implies: The isotope decays very slowly The energy of decay is very small The products have small masses A quantity of the isotope will have a large activity It must be an alpha decay
5. All radioactive decay processes are: First order Second order Dependent on temperature Dangerous None of the above
6. In an alpha decay process: Electrons are emitted A proton is converted into a neutron One of the products is a 42He nucleus Alpha particles are destroyed None of the above
7. The reaction 6326Fe ® 6325Mn involves which type of decay? b- alpha fission fusion electron capture
8. The difficulty with initiating a fusion reaction for power generation is:
The fuel required (hydrogen) is difficult to come by The temperatures required to overcome the electrostatic repulsion of the protons is large Hydrogen is explosive None of the above
9. The missing nuclide in the reaction 23892U + 126C ® ? + 6 10n is:
25098Cf 24998Cf 24498Cf 24492U 244104Rf
10. Radiocarbon dating is performed on an old object. The disintegration rate of the carbon-14 in the object is 1/32 that in living material. Approximately how old is the object? (The half life of carbon-14 is 5730 y.)
5730 / 32 years 5730 / 5 years 5730 x 5 years 5730 x 32 years 5730 x 14 years