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lora16 [44]
3 years ago
12

If two metals both have the same color, have similar densities, and are about the same size, but one is shiny and the other is d

ull, they can be separated based on the physical property known as what?
Chemistry
1 answer:
Papessa [141]3 years ago
7 0
<span>If two metals both have the same color, have similar densities, and are about the same size, but one is shiny and the other is dull, they can be separated based on the lustrous physical property of a metal. Lustrous is the property of the metal to shine/gleam gently because of its particle arrangement of atoms. </span>
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If the half-life of a radioactive element is 4 days, how long will it take for three- fourths of a sample of the element to deca
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Answer:

\boxed{\text{8 da}}

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We can construct a table as follows:

\begin{array}{cccl}\textbf{No. of} & & \textbf{Fraction} & \\\textbf{half-lives} & \textbf{t/da} & \textbf{remaining} & \\1 & 4 & \dfrac{1}{2} & \\\\2 & 8 & \dfrac{1}{4}& \\\\3 & 12 & \dfrac{1}{8}& \\\end{array}

\text{We see that 8 da is two half-lives, and the fraction of the element remaining is $\frac{1}{4}$.}\\\text{It takes $\boxed{\textbf{8 da}}$ for three-fourths of the element to decay}

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