Nuclear chemistry Questions and Answers

Carbon 14 is generated in the atmosphere by the nuclear reaction 14 14 4N n C The missing species is an a particle ay ray a proton a positron an B particle 6

If an operator 12 m from a small source is exposed to 1 7 units of radiation what will be the intensity of the radiation if he moves to 1 3 m from the source The intensity of the radiation will be i units

What is the mass defect for americium 241 if the mass of the nucleus is 241 05682 u Am Hint 1 8995221 Incorrect u Calculate the binding energy for Am 241

5 3 points The nuclear reaction depicted below is an example of 200 81 O O O O 200 80 Hg emission of a positron emission of B particle emission of a particle capture of an electron emission of a y ray

4 People in Michigan can unknowingly be exposed to harmful radon gas in their basements It is colorless and odorless and can cause lung cancer Which of the following types of nuclear radiation would you expect to cause the most damage from breathing in radon A Alpha particle B Beta particle C Gamma ray D They all affect the human body equally

If the intensity of radiation from a radioactive sources is 6 6 units at a distance of 6 2 m how many meters from the source would you have to move to reduce the intensity to 0 10 unit Report your answer in whole number Do not put unit in your answer Type your answer

Carbon 14 dating is based on the fact that C 14 is continuously being made in the upper atmosphere True False

14 Unstable isotopes like oxygen 18 will throw off particles in order to return to a more stable arrangement Which of these types of radioactive decay would be most likely for this isotope O A Alpha decay because the nucleus is too large B Beta minus decay because there are too many neutrons C Beta plus decay because there are too many protons D Gamma decay because the mass of the nucleus is too small

Which reaction is a fission reaction A 235U n B H H He n CO HeF H D 92 A 238U23 Th He 92 OB L Xe 38Sr 2 n 54 90

17 3 points Match the terms with their definitions Incorrect choices will be penalized A process by which very light nuclei join to form a heavier nuclei A process which the splitting of a heavy nucleus into two lighter ones A nucleus which is formed when a bombarding particle is captured by a target nucleus The change of one isotope into another Compound nucleus Transmutation Nuclear fission Nuclear fusion

What is nuclear fusion A Nuclear fusion is a process in which heavy element disintegrates into lighter elements with the absorption of a large amount of energy Nuclear fusion is the process of two lighter elements coming together to form a heavier element along with the absorption of a large amount of energy B Nuclear fusion is the process of two lighter elements coming together to form a heavier element along with the release of a large amount of energy C Nuclear fusion is a process in which heavy element disintegrates into lighter elements with the release of a large amount of energy D OC A

What happens to an atom when it emits an alpha particle The atomic number decreases by two and the atomic mass decreases by four The atomic number decreases by four and the atomic mass decreases by two The atomic number decreases by one and the atomic mass remains constant The atomic number and the atomic mass remain constant The atomic number increases by one while the atomic mass remains constant

If the half life of a radioactive element is 27 7 years how many years will it take for a sample to decay to the point where its activity is 71 1 of the original value Report your answer with 1 place after the decimal point Do not report unit in your answer Tyne your answer

The nuclear process 87 86 37 Kr 36 Kr 36 could be caused by O alpha emission from the reactant nucleus proton emission from the reactant nucleus electron capture by the reactant nucleus beta emission from the reactant nucleus neutron emission from the reactant nucleus

What happens to an atom when it emits a beta particle The atomic number increases by one while the atomic mass remains constant The atomic number and the atomic mass remain constant The atomic number decreases by four and the atomic mass decreases by two The atomic number decreases by two and the atomic mass decreases by four The atomic number decreases by one and the atomic mass remains constant

What is beta radiation Beta radiation occurs when the nucleus emits an electron Beta radiation is a type of electromagnetic radiation that is essentially a high energy photon Beta radiation occurs when the nucleus emits a particle that contains 2 protons and 2 neutrons Beta radiation occurs during the conversion of a proton in the nucleus to a neutron

Beta radiation occurs when the nucleus emits an electron Beta radiation is a type of electromagnetic radiation that is essentially a high energy photon O Beta radiation occurs when the nucleus emits a particle that contains 2 protons and 2 neutrons O Beta radiation occurs during the conversion of a proton in the nucleus to a neutron

Which daughter nuclide results from the alpha decay of radon 218 A 218 D Ra Po B 214Rn C Ac B OC

Iron 59 is a beta emitter with a half life of 44 5 days If a sample initially contains 96 of iron 59 how much iron 59 is left in the sample after 178 days 6 0 mol 24 mol O 0 01 mol 12 mol

What is a critical mass A critical mass is the minimum amount of uranium needed to create a chain reaction A critical mass is the maximum amount of uranium needed to create a chain reaction A critical mass is the minimum amount of explosives needed to create a nuclear bomb A critical mass is the minimum amount of hydrogen needed to create a chain synthesis reaction

1 Complete the following nuclear equations Write the mass number and atomic number for the remaining particle as well as its symbol 4 points a Fe He 2n b 20Ca 10K H 194 c Kr 36 37 d Ar e

Write balanced nuclear equations for the following processes 4 points a Beta emission of europium 157 b Electron capture of barium 126 c Alpha emission of samarium 146 d Position emission of tantalium 165

The half life of cesium 137 is 30 years Suppose we have a 190 mg sample a Find the mass in mg that remains after t years y t mg b How much of the sample in mg remains after 130 years Round your answer to two decimal places mg c After how many years will only 1 mg remain Round your answer to one decimal place yr

4 Complete the table below Figure 21 4 will be helpful in determining stability and most likely decay process Tellurium 137 Number of neutrons n Number of protons p Stable or unstable Most likely decay process if any Gold 176

Americium 241 is widely used in smoke detectors Calculate the amount of americium 241 consumed in a smoke detector initially containing 2 30 ug of Am in micrograms that has been used for one year if the half life is 433 years

Consider a linear complex in which the ligands are oriented at an angle of 180 degrees from each other In the figure below the negative charges blue spheres represent the ligands and the positive charge the red sphere represents the central metal ion Using the orientation of the d orbitals with respect to the x y and z axes rank the d orbitals in order of decreasing energy in this crystal field Rank from highest to lowest energy To rank items as equivalent overlap them View Available Hint s d 2 dzz dyz dzy d Reset Help

A patient receives 5 3 ng of a radioisotope with a half life of 12 hours How much will remain in th body after 3 63 days assuming that radioactive decay is the only path for removal of the isotope fr the body Enter your answer in the box provided

2 attempts left Check my work A patient receives 5 3 ng of a radioisotope with a half life of 12 hours How much will remain in the body after 3 63 days assuming that radioactive decay is the only path for removal of the isotope from the body Enter your answer in the box provided

If a tree dies and the trunk remains undisturbed for 1 590 x 10 years what percentage of the original C is still present The half life of 4C is 5730 years

Select the major characteristic s of nuclei for which we predict a high degree of stal Select all that apply Large nuclei 84 Isotopes with even numbers of protons or neutrons Isotopes with more protons than neutrons For ZS 10 near a 1 1 ratio of protons to neutrons in the nucleus Isotopes containing 2 8 20 50 82 or 126 protons or neutrons

Click in the answer box to activate palette Element 106 was recently named seaborgium Sg in honor of Glenn T Seaborg a pioneer in the discovery of lanthanide and actinide elements Seaborgium 263 decays by alpha emission Use nuch symbols to write a balanced nuclear equation for this process

Click in the answer box to activate the palette Use nuclear symbols to write a balanced nuclear equation for positron emission by nitrogen 12

3 attempts lef Click in the answer box to activate the palette Enter the nuclear symbol for nitrogen 14

Click in the answer box to activate palette Iodine 131 useful in the treatment of certain kinds of thyroid disease decays by beta emission Writ the nuclear symbol for the unknown product 131 I 53

Click in the answer box to activate the palette Complete the following nuclear equation Write the nuclear symbol for the unknown product 190 78 Pt a

he potassium 38 nuclide radioactively decays by positron emission Write a balanced nuclear chemical equation that describes this process 0 0 X Y C

The carbon 14 nuclide radioactively decays by beta emission Write a balanced nuclear chemical equation that describes this process 0 X Y C

The uranium 238 nuclide radioactively decays by alpha emission Write a balanced nuclear chemical equation that describes this process 0 0 6 Y C

The tungsten 180 nuclide radioactively decays by alpha emission Write a balanced nuclear chemical equation that describes this process 0 Y

1 1 point What type of radiation is released when an unstable nucleus rearranges itself in order to become more stable Neutron Positron Gamma Ray Alpha Particle

1 point What is produced when a Be 9 is bombarded with an alpha particle 9 24Be 4 He Al 6 Al 13 C 13 C 12

1 point What isotope is formed when B 8 undergoes positron emission Boron is atomic number 5 Be 8 C 6 C 12 s Be 4

1 point Determine the in the following nuclear equation 14 N 0 e O 8 C 6 O 14 C 14

Select or type in the best answer for each question over Ch 16 Nuclear Chemistry You will be allowed to use your periodic table and calculator on this quiz 1 point What isotope is produced in the following 115 547Ag 18 Cd 115 Ag 115 Pd 115 None of these D

1 point An electron that is emitted during radioactive decay is called a Beta Particle Gamma Ray Alpha Particle Neutron Positron x

1 point 228 What isotope is produced when 88 Ra undergoes alpha decay Rn 86 Th 90 Rn 224 Th 232

1 point In a nuclear fission reaction the nucleus of an atom is D spontaneously releasing large amounts of energy fused with another nucleus losing a proton with great amounts of energy released

1 point If the atomic number decreases by two 2 what type of radiation was released Neutron Positron Beta Particle Alpha Particle

1 point Chain Reactions are an example of what process Nuclear Fission Nuclear Fusion Radioactive Decay Radioactivity Oxidation DO

The sodium 22 nuclide radioactively decays by positron emission Write a balanced nuclear chemical equation that describes this process 0 Y C