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ruslelena [56]
3 years ago
6

Pls answer this question its important

Chemistry
1 answer:
Sedaia [141]3 years ago
6 0

Answer:

11) B

Explanation:

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What is the Anion and it’s charge.
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anion has a negative charge

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When an excited electron in a hydrogen atom falls from ????=5 to ????=2, a photon of blue light is emitted. If an excited electr
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Answer:

n = 3

Explanation:

Given the formula for the transition energy of an atom with 1 electron:

E=-13.6*Z^{2}*(\frac{1}{n_{f}^{2}}-\frac{1}{n_{i}^{2}} ) eV

For the H transition n=5 to n=2:

E=-13.6*(\frac{1}{4}-\frac{1}{25} ) eV=-2.856 eV

Then we solve for nf with Z=2 (Helium)

n_{f}=\sqrt{\frac{n_{i}^{2}*Z^{2}*13.6 eV }{2.856eV*n_{i}^{2}+13.6eV*Z^{2}} }

n_{f}=\sqrt{\frac{4^{2}*2^{2}*13.6 eV }{2.856eV*4^{2}+13.6eV*2^{2}} }=3

Is near 3, actually the energy of the transitions are:

H (5⇒2) = -2.85 eV = 434 nm (Dark blue)

He (4⇒3) = -2.64 eV = 469 nm (Light blue)

I thought it was cool to see the actual colors. Included them.

4 0
3 years ago
*SCIENCE*
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C.  

Their radiation facilitates nuclear fusion in young stars.


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Scientific models can never be changed. Please select the best answer from the choices provided T F
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False, because new information is being discovered all the time so they add the new information to the models to make them accurate.
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Which can be excluded due to the absence of fossil records
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a. body of jellyfish

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it is because they are made up of 95 percent of water and cannot be stored in rocks as fossil ...plz add my answer as brainliest

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3 years ago
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