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olga nikolaevna [1]
4 years ago
15

Explain why surface area-to-volume ratios are important in affecting a biological system’s ability to obtain necessary resources

or eliminate waste products.
Advanced Placement (AP)
1 answer:
Tasya [4]4 years ago
8 0

These ratios are super important for communication between cells, getting things into cells, getting rid of waste and pretty much all functions of a cell. Think about some dough. If it is in a ball, it will be pretty hard to get something to all of its parts. Now if this dough is rolled out into a sheet, whatever we are trying to get to the rest of the dough can be easily added to all of it.

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Suppose you have 61.8 grams of elemental chromium. How many grams would be the isotope chromium - 50?
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Answer:

The mass of the isotope Chromium-50 would be 2.685 grams in 61.8 grams of elemental Chromium.

Explanation:

Natural chromium (Cr) is composed of four stable isotopes: ^{50} Cr (4.345 % abundance), ^{52}Cr (83.789 % abundance), ^{53}Cr (9.501 % abundance) and ^{54}Cr (2.365 % abundance). We can obtained the total mass of the isotope Chromium-50 (m_{^{50}Cr}), measured in grams, by multiplying the mass of elemental chromium (m_{Cr}), measured in grams by percentage ratio (r), dimensionless. That is:

m_{^{50}Cr} = \frac{r}{100}\cdot m_{Cr}

If we know that r = 4.345 and m_{Cr} = 61.8\,g, then the mass of isotope Chromium-50 would be:

m_{^{50}Cr} = \frac{4.345}{100}\cdot (61.8\,g)

m_{^{50}Cr} = 2.685\,g

The mass of the isotope Chromium-50 would be 2.685 grams in 61.8 grams of elemental Chromium.

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