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LuckyWell [14K]
3 years ago
5

What is the difference between Mixtures and Compounds? I am trying to study for my Science quiz on Tuesday, and I need to know t

he difference between the two. Also, my teacher used cake as an example, but I am confused on which one it is because if you just mixed it in a bowl, it would be a Mixture right? But if it's baked, it would be a compound right?
Chemistry
1 answer:
Deffense [45]3 years ago
8 0
A mixture can be separated.  Everything in a mixture keeps it's own properties and are not chemically joined together.  I am not completely sure about the compound.  Although with the cake example, the ingredients have been mixed and kind of "fused" together upon baking. Hope this helps a little. (P.S. trail mix is a good example of a mixture.)
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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}}

Explanation:

The question will be easier to solve if we interpret it as, " How long will it take until one-fourth of a sample of the element remains,?"

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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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