3 years ago

The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

1 answer:

6 0

After 1 half life its half the element
after 2 hl its quarter remaining
after 3 hl its half the quarter which is 1 eighth
after 3 half lifes

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If you dilute 19.0 mL of the stock solution to a final volume of 0.310 L , what will be the concentration of the diluted solutio

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$M_2=0.613M_1$

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$M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{M_119}{310}\\\Rightarrow M_2=M_1\times\dfrac{19}{310}\\\Rightarrow M_2=0.613M_1$

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3 years ago

2) which statement describes ionic bonding?

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odpowiedzi d

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