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Svetradugi [14.3K]
3 years ago
11

The radius of a uranium atom is 149 pm. How many uranium atoms would have to be laid side by side to span a distance of 4.96 mm?

Chemistry
2 answers:
nikitadnepr [17]3 years ago
4 0

Answer:

4960000000 pm

Explanation:

4.96*1000000000= 4960000000

djverab [1.8K]3 years ago
3 0

Answer:

Uranium atoms required to be laid side by side to span a distance of 4.96 mm is 1.6644\times 10^7 atoms.

Explanation:

The radius of a uranium atom ,r = 149 pm =1.49\times 10^{-7} mm

1 pm=10^{-9} mm

The diameter of a uranium atom ,d =

d = 2r =2\times 1.49\times 10^{-7} mm=2.98\times 10^{-7} mm

The let the uranium atom to be laid side by side to span a distance of 4.96 mm be x.

x\times d=4.96 mm

x=\frac{4.96 mm}{d}=\frac{4.96 mm}{2.98\times 10^{-7} mm}=1.6644\times 10^7 atoms.

Uranium atoms required to be laid side by side to span a distance of 4.96 mm is 1.6644\times 10^7 atoms.

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3 years ago
What is the ratio of lactic acid (Ka = 1.37x^10-4) to lactate in a solution with pH =4.29
hram777 [196]

Henderson–Hasselbalch equation is given as,

                                         pH  =  pKa  +  log [A⁻] / [HA]   -------- (1)

Solution:

Convert Ka into pKa,

                                         pKa  =  -log Ka

                                         pKa  =  -log 1.37 × 10⁻⁴

                                         pKa  =  3.863

Putting value of pKa and pH in eq.1,

                                         4.29  =  3.863 + log [lactate] / [lactic acid]

Or,

                   log [lactate] / [lactic acid]  =  4.29 - 3.863

                   log [lactate] / [lactic acid]  =  0.427

Taking Anti log,

                             [lactate] / [lactic acid]  =  2.673

Result:

           2.673 M  lactate salt when mixed with 1 M Lactic acid produces a buffer of pH = 4.29.

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3 years ago
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Answer:

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The marshmallow turning brown and bubbling implies that a chemical change has taken place.

For chemical changes to occur, we observe any of the following:

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  • the process is not easily reversible
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  • requires considerable amount of energy.

ii. Two signs that shows a chemical change has taken place is that:

  • bubbles are being formed as it is roasted and it implies that new substances have been formed.
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5 0
2 years ago
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