Nuclear chemistry Questions and Answers

An isotope with a half life of 18 0 seconds was produced in a physics lab as a by product of a reaction Exactly how many half lives pass after 126 seconds have elapsed Enter only a number

On your own paper write the equation for the nuclear reaction described in each of the following processes 1 The transmutation that occurs when a scandium 48 nucleus undergoes beta decay 2 Americium 241 undergoes alpha decay inside a smoke detector 3 Technetium 99 99mTc undergoes gamma decay to form 99Tc Upload your equations Posted Today at 9 13 am Comments

Enter the expression 4N a where a is the lowercase Greek letter alpha Express your answer as a chemical expression A O B Y V

Identify the resultant isotope when Bismuth 216 undergoes 2 alpha decays 3 beta decays and 1 electron capture Report the element name chemical symbol is acceptable and the isotope mass in the blanks below Isotope element name Isotope element mass Blank 1 Blank 2

26 The isotope cobalt 57 has a half life of 272 d How long will it take a sample of 57Co to decay to 38 of its original activity A 103 d B 337 d C 188 d D 380 d

24 Which of the following represents a fission reaction A Hydrogen 2 and helium 3 combining to form a helium 5 atom and a neutron B Carbon 14 and helium 3 combining to form a sodium 13 atom and a proton C Polonium 215 absorbing a proton to form polonium 218 D Uranium 235 absorbing a neutron and breaking into barium 141 krypton 92 and three neutrons

3 lodine 131 is used to detect and treat thyroid disorders a If someone was injected with lodine 131 how long would it take for the sample to decay to 1 16 of the original dose b Write the decay equation showing what type of radiation is emitted and what the decay product would be c Would we expect the decay product from part b to be very reactive or not Why

4 Strontium 90 is an especially harmful byproduct of nuclear fission because the body treats it as though it were calcium How long is Sr 90 s half life if 1 16 of a sample remains

Find the half ife of a radioactive substance that decays by 2 in 5 years Round your answer to one decimal place

28 Identify the missing particle in the following reaction 212 83 A 23Bi 79 Au 212 204 299 Au 79 204 Zr B C D 29 Identify the missing particle in the following reaction 97 Zr A 96 B Zr c He 38 Sr D He 28 Ti A Be B He c H D B in 235U 2n 32Te 30 Identify the missing particle in the following reaction Li ne He

27 The nuclear process that takes place in an atomic bomb or in a nuclear reactor in a more controlled fashion is illustrated in the highly simplified diagram shown below In reality the splitting of U235 into the same parts each time is not realistic A B C 11 D U 235 Ba 141 Kr 92 In the diagram above energy is released when each uranium nucleus is split Which statement is true n The mass of the uranium is equal to the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is less than the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is more than the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is equal to the mass of Ba141 Kr92 and 3 neutrons

1 An aircraft company is receiving complaints that passengers in their planes are receiving high levels of radiation from the Sun and other background radiation sources They respond by posting the following response online Airline company All of our aircraft are designed with state of the art aluminum sheeting that blocks all radiation types from all sources Thus our passengers are not exposed to any dangerous levels of radiation inside of our aircraft The Sun and other background sources produce alpha beta and gamma radiation all of which enter Earth s atmosphere Based on all of the information what statement best evaluates the airline company s claims A B C D The airline company has made a correct claim about their aircraft and radiation The aluminum sheeting will not be able to block any type of radiation The aluminum sheeting will not block the high energy gamma radiation Aluminum could block the weak background radiation but not the Sun s radiation

22 Ernest Rutherford used alpha particles in his research which resulted in the discovery of th nucleus Which of the following reactions releases alpha particles that could be potentiall used for this kind of particle research A B C 226 Ra 88 14 4C 4 N 222 Rn 86 6 18 8F 9 1 18 80

one ene 29 Identify the element in the reaction that is missing and then identify the type of reaction as alpha be or gamma 1942K 10e 00Y Gramme Jeany

500ms 25 From the time constant for C 14 determine the half life for beta decay of C 14 in clicks 26 Convert the half life of C 14 to years Hint use your measured value of the total time C 14 Click 0 1 2 3 4 5 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Table 2 Beta Decay C 14 88 79 75 64 59 SI 48 43 39 36 32 27 21 19 M 100 as 15 n 13 9 8 years N 14 0 4 11 20 24 40 48 61 56 60 63 67 72 78 80 35 82 84 86 88 90 91

Write the first four steps in the radioactive decay series of Bismuth 215 AN 83 Alpha and Beta go in the Yellow box for it to be graded correctly 1 Alpha 2 Beta