AnswersCA-Chemistry AThe Nucleus

The Nucleus Answers

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Which of these statements about half-life is true? Check all that apply.

A
Half-lives vary dramatically from isotope to isotope.
B
A relationship exists between isotopes and half-lives.
C
Half-lives are constant for a particular isotope.
D
Half-life is an exact measure of when individual atoms will decay.
E
Temperature, pressure, and density affect the half-life of an isotope.
2
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A sample contains 2.2 g of the radioisotope niobium-91 and 15.4 g of its daughter isotope, zirconium-91. If the half-life of niobium-91 is 680 years, how long will it take for the decay described in the previous question?

A
680 years
B
1,360 years
C
2,040 years
D
2,720 years

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The Nucleus Answers — CA-Chemistry A