Answer:
90.2 da
Explanation:
The <em>half-life</em> of iron-59 (45.1 da) is the time it takes for half the Fe to decay.
After one half-life, half (50 %) of the original amount will remain.
After a second half-life, half of that amount (25 %) will remain, and so on.
We can construct a table as follows:
No. of Time Percent Fraction
<u>half-lives</u> <u>days</u> <u>remaining</u> <u>remaining
</u>
1 45.1 50 ½
2 90.2 25 ¼
3 135 12.5 ⅛
4 180 6.25 ¹/₁₆
We see that 25 % remains after two half-lives or 90.2 da.
Answer:
Definition of Inert. An inert chemical is one that is stable and unreactive under specified conditions. ... However, most of the noble gases have now been observed to form compounds, although generally under unusual conditions. Helium and neon are highly inert; they form no compounds.
Answer:
Explanation:
Bird courtship and mating dances include many unique ways to attract mates. Learn about their courtship behaviors and why they matter. ... When birders recognize courting birds, they can be sure to avoid disturbing ... the charming songs used to woo partners can help distinguish species so birds are sure ...
Answer:K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket StartBracket upper C a upper O EndBracket over StartBracket upper C a upper C upper O subscript 3 EndBracket EndFraction
Explanation: the answer has it's root in Law of mass action which states that; the rate of a chemical reaction is directly proportional to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.
