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Advocard [28]
2 years ago
14

In witch step did a chemical change most likely occur

Chemistry
1 answer:
11Alexandr11 [23.1K]2 years ago
6 0

Answer:

step 2

hope this helps!

please mark as brainiest<3

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Given the wavelength of the corresponding emission line, calculate the equivalent radiated energy from n = 4 to n = 2 in both jo
lions [1.4K]

Explanation:

It is given that,

Initial orbit of electrons, n_i=4

Final orbit of electrons, n_f=2

We need to find energy, wavelength and frequency of the wave.

When atom make transition from one orbit to another, the energy of wave is given by :

E=-13.6(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})

Putting all the values we get :

E=-13.6(\dfrac{1}{(4)^2}-\dfrac{1}{(2)^2})\\\\E=2.55\ eV

We know that : 1\ eV=1.6\times 10^{-19}\ J

So,

E=2.55\times 1.6\times 10^{-19}\\\\E=4.08\times 10^{-19}\ J

Energy of wave in terms of frequency is given by :

E=hf

f=\dfrac{E}{h}\\\\f=\dfrac{4.08\times 10^{-19}}{6.63\times 10^{-34}}\\\\f=6.14\times 10^{14}\ Hz

Also, c=f\lambda

\lambda is wavelength

So,

\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{6.14\times 10^{14}}\\\\\lambda=4.88\times 10^{-7}\ m\\\\\lambda=488\ nm

Hence, this is the required solution.

4 0
3 years ago
magine that an uncharged pith ball is brought into the electrostatic field of a charged rod. The side of the pith ball closest t
ivanzaharov [21]
Answer: option <span>D. be given a positive charge produced by the movement of electrons to the other end of the ball.
</span>

Explanation:


This phenomenon is called electrostatic induction.


The excess of negative charge on the end of the rod will repel the electrons on the side of the pith ball that have been approached to it.

Then the electrons on the pith ball will move far away from this end with it will be left an excess of positive charge.

In this way the rod has induced that the ball acquires a positive charge on one end and a negative charge on the other end.
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4 0
3 years ago
What volume of a 9.00 M NaOH stock solution would you need to make 800. ML of a 0.750 M NaOH solution
joja [24]

Answer: 66.66 ml

Explanation: Using Molarity equation:

M_1V_1 (stock solution)=M_2V_2(solution to be prepared)

given: M_2=0.750M

V_2=800ml

M_1=9.00M

V_1=?

9.00M\times V_1 (stock solution)=0.750M\times 800ml (solution)

V_1= 66.66ml

8 0
3 years ago
Who was in control of Afghanistan when the U.S. and Allied forces invaded it in 2001?
Llana [10]
<span>A. al-Qaeda was in charge of the terror attacks and they were the ones who were in charge of Afghanistan.   </span>
6 0
3 years ago
Read 2 more answers
Using 21st-century technology, hydrogen fusion requires temperatures around 10^8 K. But, lower initial temperatures are used if
Bezzdna [24]

<u>No, the captain should continue using the current technology.</u>

<u></u>

<h3>How Nuclear Fusion Reactors Work?</h3>

­W­hen hydrogen atoms fuse, the nuclei must come together. However, the protons in each nucleus will tend to repel each other because they have the same charge (positive). If you've ever tried to place two magnets together and felt them push apart from each other, you've experienced this principle firsthand.

To achieve fusion­, you need to create special conditions to overcome this tendency. Here are the conditions that make fusion possible:

High temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons.

  • Fusion requires temperatures of about 100 million Kelvin (approximately six times hotter than the sun's core).
  • At these temperatures, hydrogen is a plasma, not a gas. Plasma is a high-energy state of matter in which all the electrons are stripped from atoms and move freely about.
  • The sun achieves these temperatures by its large mass and the force of gravity compressing this mass in the core. We must use energy from microwaves, lasers and ion particles to achieve these temperatures.

High pressure squeezes the hydrogen atoms together. They must be within 1x10-15 meters of each other to fuse.

  • The sun uses its mass and the force of gravity to squeeze hydrogen atoms together in its core.
  • We must squeeze hydrogen atoms together by using intense magnetic fields, powerful lasers or ion beams.

Learn more about Fusion

brainly.com/question/9464925

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3 0
2 years ago
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