Half-Life

Question 1

Identify the parent isotope and daughter isotope in this nuclear reaction:Which is the parent isotope?

Revolt · Accepted Answer

Superscript 222 subscript 88 upper R a.

Question 2

Identify the daughter isotope in this nuclear reaction:Which is the daughter isotope?

Revolt · Accepted Answer

Superscript 218 subscript 86 R n.

Question 3

Which time frame correctly describes the range of half-lives?

Revolt · Accepted Answer

fractions of a second to billions of years

Question 4

Argon-39 has a half-life of 269 years. How long will it take for 52.5 g of a 60.0 g sample to decay to its daughter isotope? years

Revolt · Accepted Answer

807

Question 5

An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its half-life? days

Revolt · Accepted Answer

8

Question 6

Rachel has an unknown sample of a radioisotope listed in the table. Using a special technique, she is able to measure the mass of just the unknown isotope as 104.8 kg at 12:02:00 P.M. At 4:11:00 P.M. on the same day, the mass of the unknown radioisotope is 13.1 kg. Which radioisotope is in the sample?

Revolt · Accepted Answer

Barium-139

Half-Life Answers

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