Answer:
What are we helping you on?
Explanation:
..
Ok so, it all comes down to basically how nice the teachers are? Go to them and ask them personally if they'd take any late work or makeup work. Also ask (but in a very kiss butt way) if there was any chance theyd be willing to give you extra credit. The key to doing this is like basically just begging them and being super apologetic. Be fake and see if it gets you anywhere?
Answer:
when we have a chemical reaction the total of all substances don't change
Answer:
Explanation:
Radioactive decay follows the equation:
Ln [A] = -kt + ln [A]₀
<em>Where [A] is amount of isotope after time t: Our incognite,</em>
<em>k is rate constant: ln 2 / Half-life = 0.0231 years⁻¹</em>
<em>t are 60 years</em>
<em>[A]₀ is initial amount of isotope: 1.0g</em>
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Replacing:
Ln [A] = -kt + ln [A]₀
Ln [A] = -0.0231 years⁻¹*60 years + ln 1.0g
ln [A] = -1.386
[A] = 0.25g
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