6. Smoke detectors contain small amounts of americium-241. Am-241 decays by emitting alpha particles and has a decay constant of 1.51x103/y. If a smoke detector gives off ten disintegrations per second how many grams of Am-241 are present in the detector? 7. Calculate the mass defect (Am) and the binding energy of Berylium-9. ANSWER 1/6..07 53 E 8. Considerthe fission reaction in which U-235 is bombarded by neutrons. The products of the bombardment are Rb-89. Ce-144, beta particles and more neutrons. The atomic mass of Rb-89 is 88.912278 and Ce- 144 is 143.91365. a. Write the balanced nuclear equation for the bombardment. 85u+n ce+ 3 ANSWER utogn Rb +144Cet3e + &4 5. Oalculate AE when one gram of U-235 undergoes fission. ANSWER c. The detonation of TNT, an explosive, evolves 2.76 kJ/g/ How many kilograms of TNT are required to produce the same amount of energy as one milligram of U-235? ANSWER

Topic: Nuclear Chemistry

Q3 Radium-224 decays through the pathway a, a, a, ß, a, ß. What intermediates are formed in this decay series? What is the final stable nucleus formed?

/ilmn/takeAssignment/takeCovalentActivity.do?locator=assignment-take [References] CHEMWORK Rubidium-87 decays by B production to strontium-87 with a half life of 4.7 x 10¹0 years. What is the age of a rock sample that contains 102.1 µg 87Rb and 7.3 µg 87Sr? years old Assume that no 87 Sr was present when the rock was formed. The atomic masses are given in the table below: Nuclide Atomic Mass 87Rb 86.90919 86.90888 Try Another Version 3 item attempts remaining h Previous earch 87 Sr Submit Submit Answer BI Cengage Learning Cengage Technical Support 31°C Haze Save and I 9:18 4/29/ F»))

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A sample of cesium-137 has an activity of 8.00 mCi.  How many micrograms of Cs-137 are present in the sample? T1/2=30.08 years

The following isotopes are all stable : 20Ne, Ne, 22Ne 10+ 10- While the following is not, so what be its decay likely? 23 Ne 10- Alpha Positron Electron capture Beta

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text f5 A % 5 T Calibri 1 16 ¹ 4 1.8 6 - Y 13. The following equation models the beta decay of krypton-89 into rubidium-89. 89 Kr 36 f7 (1) 18 2 & Explain why this reaction is not an example of alpha decay. 7 89 14. Gamma radiation is used to treat certain types of tumors deep in the brain that cannot be accessed with surgery. Suggest a possible reason to explain why gamma radiation is preferred over beta decay or alpha decay for this treatment. fg B U Rb + e - 3 V IUA O fg 8 f10 insert 9 O f11 ☆ O 5 P F12 ▼ $ ✓= prt scr + H 7 G 63°F Cloudy ^ E ] CZ1 delete backspace

a. Write the nuclear equation for the alpha decay of ^221-81Rn. b. Write the nuclear equation for the radioactive decay of ^21-15P by positron emission. c.  Imagine that you started with a 0.1 g sample of iodine-131, and now you have only 0.025 g remaining. If the half-life of iodine-131 is 8 days, how old is the sample? Write 2 - 3 sentences explaining your reasoning. d. Draw a diagram that illustrates how nuclei change during nuclear fusion. Write 2 - 3 sentences describing the process of nuclear fusion, including where it occurs and how the energy released can be harnessed for use in homes.