Homework Answers
Half life decay is used in order to relate time and concentration change
it is a convinient 50% change, since it marks the time reuqired to get halved
The typical formual used:
Afinal = Ainitial * (1/2)^(time/Half life)
we can always get half life given:
Afinal/Ainitial = (1/2)^(time/Half life)
if Afinal /Ainitial = 0.5, then
time = half life
Question 8 What is the relationship between the rate constant and the half-life for nuclear decay?...
Question 8 What is the relationship between the rate constant and the half-life for nuclear decay? In (2) k = 1112 ok= ln (0.69311/2) rate = kt12 ok=0.693112 In (0.693) 11 12
Nuclear decay: Describe (and give 4 examples) of nuclear decay and isotopes that are associated with...
Nuclear decay: Describe (and give 4 examples) of nuclear decay and isotopes that are associated with each one (and why)
6) Pu-239 is produced in the nuclear fuel cycle in nuclear power plants. The half-life of...
6) Pu-239 is produced in the nuclear fuel cycle in nuclear power plants. The half-life of Pu- 239 is 24,000 years. If 500.0mg of Pu-239 are generated this year, how much will remain this month in the year 2683? (2 points) a. b. How much of the original 500.0 mg of Pu-239 will be left after 6 half-lives? (2 points) 7) Polonium-210 has a half-life of 140 days. How long will it take for a sample of 385g of Polonium-210...
1-2 lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life o...
1-2
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life of 8.0 days. 2) Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240-mol sample of radium to decay to 1.50x 10 mol?
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with...
Part A Explain the concept of half-life. Match the words in the left column to the...
Part A Explain the concept of half-life. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help third the time mass increasing rates The half-life of a radioactive ruclide is It takes for of the original parent nuclides in a radioactive sample The half-life can be used to determine radioactive part quarter the temperature Increase the mass deactivation rates to deactivate...
Problem 5 Concept: Half-life and rate constant 0 Not finished! Level: Basic How much time in...
Problem 5 Concept: Half-life and rate constant 0 Not finished! Level: Basic How much time in hours would it take for a 2.649 g sample of 18F to decay to a mass of 1.465 g if it has a half-life of 6.5880e+3 s. Enter answer here: Problem 6 Concept: Age of material 0 Not finished! Level: Intermediate A rock containing 238U and 206Pb was examined to determine its approximate age. The sample of a rock contained 1.611 g of 206Pb...
QUESTION ANSWER 12.2 minutes Nuclear decay occurs according to first-order kineties. What is the half-life for...
QUESTION ANSWER 12.2 minutes Nuclear decay occurs according to first-order kineties. What is the half-life for mercury-206, which has a rate constant of 8.50 10 minutes? 5.89 minutes 11.8 minutes 8.15 minutes I DON'T KNOW YET
0.323 minutes Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if...
0.323 minutes Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55,4 g ko 31.7 g in 2.50 minutes? 0.220 minutes ООООО 4.55 minutes 3.10 minutes I DON'T KNOW YFI
QUESTION ANSWER 13.5 years Nuclear decay occurs according to first-order kinetics. What is the half-life of...
QUESTION ANSWER 13.5 years Nuclear decay occurs according to first-order kinetics. What is the half-life of europium-152 if a sample decays from 10,0 g to 0.768 g in 50.0 years? 7.41 years 5.13 years 17.0 years I DON'T KNOW YET
A fossil was dated using rubidium-87, which undergoes beta decay and has a half-life of 4.75x1010...
A fossil was dated using rubidium-87, which undergoes beta decay and has a half-life of 4.75x1010 years. Calculate the age of the fossil if (5.7x10^1)% of rubidium-87 remains in the sample. Report your answer with 2 significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: X10 Answer units Question 2 (1 point) Thallium-201 is used to diagnose heart disease. The half-life of thallium-201 is 72.9 hours. If a patient takes 7.7 ug,...
Question 8 What is the relationship between the rate constant and the half-life for nuclear decay? In (2) k = 1112 ok= ln (0.69311/2) rate = kt12 ok=0.693112 In (0.693) 11 12
6) Pu-239 is produced in the nuclear fuel cycle in nuclear power plants. The half-life of Pu- 239 is 24,000 years. If 500.0mg of Pu-239 are generated this year, how much will remain this month in the year 2683? (2 points) a. b. How much of the original 500.0 mg of Pu-239 will be left after 6 half-lives? (2 points) 7) Polonium-210 has a half-life of 140 days. How long will it take for a sample of 385g of Polonium-210...
1-2
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life of 8.0 days. 2) Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240-mol sample of radium to decay to 1.50x 10 mol?
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with...
Part A Explain the concept of half-life. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help third the time mass increasing rates The half-life of a radioactive ruclide is It takes for of the original parent nuclides in a radioactive sample The half-life can be used to determine radioactive part quarter the temperature Increase the mass deactivation rates to deactivate...
QUESTION ANSWER 12.2 minutes Nuclear decay occurs according to first-order kineties. What is the half-life for mercury-206, which has a rate constant of 8.50 10 minutes? 5.89 minutes 11.8 minutes 8.15 minutes I DON'T KNOW YET
0.323 minutes Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55,4 g ko 31.7 g in 2.50 minutes? 0.220 minutes ООООО 4.55 minutes 3.10 minutes I DON'T KNOW YFI
QUESTION ANSWER 13.5 years Nuclear decay occurs according to first-order kinetics. What is the half-life of europium-152 if a sample decays from 10,0 g to 0.768 g in 50.0 years? 7.41 years 5.13 years 17.0 years I DON'T KNOW YET
A fossil was dated using rubidium-87, which undergoes beta decay and has a half-life of 4.75x1010 years. Calculate the age of the fossil if (5.7x10^1)% of rubidium-87 remains in the sample. Report your answer with 2 significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: X10 Answer units Question 2 (1 point) Thallium-201 is used to diagnose heart disease. The half-life of thallium-201 is 72.9 hours. If a patient takes 7.7 ug,...
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