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Slav-nsk [51]
3 years ago
8

The average air tempature in an area over a long period of time is called

Chemistry
2 answers:
Julli [10]3 years ago
5 0
Climate Change Hope I Helped
labwork [276]3 years ago
3 0
Climate change or it could just be Climate,
Hopefully that helps ❤
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Two isotopes of lithium are found in nature Li6 has a mass of 6. 02u and Li7 has a mass of 7.02u . Use the atomic weight of lith
alexandr402 [8]

The isotope that is more abundant, given the data is isotope Li7

<h3>Assumption</h3>
  • Let Li6 be isotope A
  • Let Li7 be isotope B

<h3>How to determine whiche isotope is more abundant</h3>
  • Molar mass of isotope A (Li6) = 6.02 u
  • Molar mass of isotope B (Li7) = 7.02 u
  • Atomic mass of lithium = 6.94 u
  • Abundance of A = A%
  • Abundance of B = (100 - A)%

Atomic mass = [(mass of A × A%) / 100] + [(mass of B × B%) / 100]

6.94 = [(6.02 × A%) / 100] + [(7.02 × (100 - A)) / 100]

6.94 = [6.02A% / 100] + [702 - 7.02A% / 100]

6.94 = [6.02A% + 702 - 7.02A%] / 100

Cross multiply

6.02A% + 702 - 7.02A% = 6.94 × 100

6.02A% + 702 - 7.02A% = 694

Collect like terms

6.02A% - 7.02A% = 694 - 702

-A% = -8

A% = 8%

Thus,

Abundance of B = (100 - A)%

Abundance of B = (100 - 8)%

Abundance of B = 92%

SUMMARY

  • Abundance of A (Li6) = 8%
  • Abundance of B (Li7) = 92%

From the above, isotope Li7 is more abundant.

Learn more about isotope:

brainly.com/question/24311846

#SPJ1

4 0
2 years ago
Define equilibrium.<br><br> plz and thxxx
Serggg [28]

Answer:

Equilibrium is the state of balance. Where opposing forces cancel each other out and no changes are occurring.

<em>Good luck, hope this helps :)</em>

5 0
2 years ago
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Why does the sun move from night-time to dayime?
valentina_108 [34]

Answer: Rotation cause by the earths orbit and gravity

Explanation:

4 0
2 years ago
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Four research teams measured the rotation period of a newly detected neutron star, and what each team wrote in its team notebook
makvit [3.9K]

Answer:

Explanation:

The correct measurement is .710 s which is equal to .71 s so second measurement that is 0.71 s is most accurate measurement .

B.  0.71s is the most accurate .

Precision depends upon measuring instrument . Measurement by highly precise instrument has greater precision .

The measurement of 0.75 ± 0.002s must have been taken from high precise instrument because it is capable of making measurement upto 3 decimal points .

Hence

C 0.75 ± 0.002s is most precise measurement .

7 0
3 years ago
What is an amu?<br> Will give Brainliest!
pantera1 [17]

Answer: Amu is an atomic mass unit.

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