Question

Which of these statements about half-life is true? Check all that apply. Half-lives vary dramatically from isotope to isotope. A relationship exists between isotopes and half-lives. Half-lives are constant for a particular isotope. Half-life is an exact measure of when individual atoms will decay. Temperature, pressure, and density affect the half-life of an isotope.​

Answer 1

Answer:

Half-lives vary dramatically from isotope to isotope.  Half-lives are constant for a particular isotope.                                                

Explanation:

A,C

Answer 2

The correct statement about half life time is half lives vary dramatically from isotope to isotope and it is constant for a particular isotope.

What is half life time?

Half life time of any reaction is that time where the concentration of product will become half of the initial concentration of reactant.

Half life time is not same for every substance it will vary from substance to substance. And for any particular substance half life time is constant untill the whole degradation of that substance. Half ife time is not depends on temeprature and pressure because it is not the rate.

Hence, half life time is constant for particular isotope and vary from isotope to isotope.

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