Nuclear Chemistry: Part 1 Unit Test Review and Test| 37 Question and Answers (A+ guide solution)

An article about half-lives describes a daughter isotope. What is a daughter isotope? - the isotope that forms from the radioactive decay of a less stable isotope Examine the nuclear reaction: 1/1H + 1/0n -> 2/1H. Why is this classified as a nuclear reaction rather than a chemical reaction? - A change has occurred in a nucleus. Consider the nuclear equation below. 239/94Pu -> X + 4/2He What is X? - 235/92U A sample contains 16.75 g of the radioisotope U-236 and 50.25 g of its daughter isotope, Th-232. How long did it take for decay to take place if one half-life of U-236 is 23 million years? - 46 million years Which represents a balanced nuclear equation? - B) 24/11Na -> 24/12Mg + 0/-1e An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have? - no charge A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide? - 131/53 I What part of an atom is involved in a chemical reaction? - electron A target is shielded from a radioactive sample by a sheet of metal. What kind of radiation can pass through the sheet of metal and hit the target? - gamma rays only