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Stella [2.4K]
3 years ago
7

Which of these best explains why a paper clip can float on water ? A.Water has a very high specific heat. B.water molecules at t

he surface experience fewer hydrogen bonds than water molecules within the liquid. C.the metal in the paper clip has a lower mass than the water. D.water molecules near the surface produce more buoyant force than water molecules within liquid.
Chemistry
2 answers:
Valentin [98]3 years ago
6 0

Answer:

water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid

Explanation:

i just took the quiz

Virty [35]3 years ago
3 0

d) water molecules near the surface produce more buoyant force than water molecules within liquid.

hope this helps!

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Antimony has two naturally occuring isotopes, 121 Sb and 123 Sb . 121 Sb has an atomic mass of 120.9038 u , and 123 Sb has an at
valina [46]

Answer:

Percentage abundance of 121 Sb is = 57.2 %

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Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope, 121 Sb :

% = x %

Mass = 120.9038 u

For second isotope, 123 Sb:

% = 100  - x  

Mass = 122.9042 u

Given, Average Mass = 121.7601 u

Thus,  

121.7601=\frac{x}{100}\times 120.9038+\frac{100-x}{100}\times 122.9042

120.9038x+122.9042\left(100-x\right)=12176.01

Solving for x, we get that:

x = 57.2 %

<u>Thus, percentage abundance of 121 Sb is = 57.2 % </u>

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3 years ago
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Answer:

pH = 4.17

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