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4 years ago

Hey I'm a newbie any help please with this

Chemistry

1 answer:

solniwko [45]4 years ago

4 0

6 A
7 A
8 B
9 B
10 A
11 C

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Is baking soda a fine powder or is it coarse

sp2606 [1]

Baking soda is a fine powder because when you touch it the baking soda is very soft

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3 years ago

What is the wavelength of radiation emitted when an electron goes from the n = 7 to the n = 4 level of the Bohr hydrogen atom? G

Phantasy [73]

Answer:

the wavelength of radiation emitted is $\mathbf{\lambda= 2169.62 \ nm}$

Explanation:

The energy of the Bohr's hydrogen atom can be expressed with the formula:

$\mathtt{E_n =- \dfrac{13.6\ ev}{n^2}}$

For n = 7:

$\mathtt{E_7 =- \dfrac{13.6\ ev}{7^2}}$

$\mathtt{E_7 =-0.27755 \ eV}$

For n = 4

$\mathtt{E_4=- \dfrac{13.6\ ev}{4^2}}$

$\mathtt{E_4 =- 0.85\ eV}$

The electron goes from the n = 7 to the n = 4, then :

$\mathtt{E_7-E_4 = (-0.27755 - (-0.85) ) \ eV}$

$\mathtt{= 0.57245\ eV}$

Wavelength of the radiation emitted:

$\mathtt{\lambda= \dfrac{hc}{0.57245 \ eV}}$

where;

hc = 1242 eV.nm

$\mathtt{\lambda= \dfrac{1242 \ eV.nm }{0.57245 \ eV}}$

$\mathbf{\lambda= 2169.62 \ nm}$

4 0

3 years ago

The length of a copper wire is 1.6 centimeters (cm). What is the length of this wire in meters (m)? 1.6 mc031-1.jpg 10–3 m 1.6 m

Klio2033 [76]

I believe the answer is 0.016. if i am wrong please tell me if it's wrong. the second option

7 0

3 years ago

Read 2 more answers

What is -22 = -9+ n

Anestetic [448]

Answer:

n= -13

Explanation:

-22 = -9 + n

first flip the equation

n + -9 = -22

then add 9 beacuse we need to do the opposite to find n

so -22 + -9 = - 13

so n = -13

plz mark brainliest i just need 1 more plz plz plz!

8 0

3 years ago

Apresentando a configuração eletrônica 1s2 2s2 2p6 3s2 3p4 um determinado elemento químico se mostra com forte tendência para:

Bess [88]

Answer:

Explanation:

To know what will happen, we need to know

the total number of electrons the element have.

This can be calculated by adding all the electrons together

That would be 2 + 2 + 6 + 2 + 4 = 16

This shows that the element is sulphur.

Now using the KLMN electronic configuration, sulphur has the shells 2,8,6 meaning there are 2 extra electrons needed for octet configuration to be achieved.

This makes option E the correct answer to the question

6 0

3 years ago