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iren2701 [21]
1 year ago
9

How do electromagnetic waves transfer energy without a medium?.

Chemistry
1 answer:
user100 [1]1 year ago
6 0

Since em waves are not conveyed by that of the vibration of electrons, they do not need a medium to travel. Electrical and magnetic fields, that could exist anywhere, oscillate, creating waves.

<h3>What do you mean by Electromagnetic waves?</h3>

The oscillations here between electrostatic potential and a magnetic field produce waves known as electromagnetic waves, or EM waves. In other words, magnetism fields oscillate to form electromagnetic (EM) waves.

<h3>Electromagnetic waves, where are they?</h3>

In contrast to wave propagation, electromagnetism waves can travel without a medium. This implies that microwaves can pass not only through stationary surfaces like air and rock but also through empty space.

To know more about Electromagnetic waves visit:

brainly.com/question/2995167

#SPJ4

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A 0.4322 g sample of a potassium hydroxide – lithium hydroxide mixture requires 27.10 mL of 0.3565 M HCl for its titration to th
Yuki888 [10]

The mass percent lithium hydroxide in the mixture with potassium hydroxide, calculated from the equivalence point in the titration of HCl with the mixture, is 19.0%.  

The mass percent of lithium hydroxide can be calculated with the following equation:  

\% = \frac{m_{LiOH}}{m_{t}} \times 100    (1)

Where:

m_{t} = m_{KOH} + m_{LiOH} = 0.4322 g   (2)  

We need to find the mass of LiOH.

From the titration, we can find the number of moles of the mixture since the number of moles of the acid is equal to the number of moles of the bases at the equivalence point.    

\eta_{HCl} = \eta_{LiOH} + \eta_{KOH}

0.0271 L*0.3565 \frac{mol}{L} = \eta_{LiOH} + \eta_{KOH}

\eta_{LiOH} + \eta_{KOH} = 9.66 \cdot 10^{-3} \:mol

Since mol = m/M, where M: is the molar mass and m is the mass, we have:

\frac{m_{LiOH}}{M_{LiOH}} + \frac{m_{KOH}}{M_{KOH}} = 9.66 \cdot 10^{-3} \:mol    (3)                                        

Solving equation (2) for m_{KOH} and entering into equation (3), we can find the mass of LiOH:  

\frac{m_{LiOH}}{M_{LiOH}} + \frac{0.4322 - m_{LiOH}}{M_{KOH}} = 9.66 \cdot 10^{-3} \:mol    

\frac{m_{LiOH}}{23.95 g/mol} + \frac{0.4322 g - m_{LiOH}}{56.1056 g/mol} = 9.66 \cdot 10^{-3} \:mol              

Solving for m_{LiOH}, we have:

m_{LiOH} = 0.082 g

Hence, the percent lithium hydroxide is (eq 1):

\% = \frac{0.082 g}{0.4322 g} \times 100 = 19.0 \%  

Therefore, the mass percent lithium hydroxide in the mixture is 19.0%.

Learn more about mass percent here:

  • brainly.com/question/6992535?referrer=searchResults
  • brainly.com/question/5840377?referrer=searchResults

I hope it helps you!                        

5 0
2 years ago
What is the relationship between pressure and temperature?<br> PLEASEEE HELPPP!!!!!
kotykmax [81]

Answer:

i forgot

Explanation:

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3 years ago
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a toy car is pushed forward with a force of 5N. Air resistance and friction apply a combined force of 3.5N backwards, what is th
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Answer:

Hi... U should do like this

5 - 3.5=1.5 (N)

6 0
2 years ago
How many surrounding electrons
Anuta_ua [19.1K]

Answer:

A

Explanation:

Chlorine has one valence electron

Hence one chlorine atom reacts with 2 atoms of lithium

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