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3 years ago

14

An electron absorbs a photon of light energy and becomes energized; the electron shifts from a atomic orbital to a ____

__ atomic orbital.

1 answer:

elena55 [62]3 years ago

3 0

Lower energy; higher energy

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Reverberation in concert halls is caused by ____. a. diffraction c. diffusion b. refraction d. reflection Please select the best

Tanya [424]

It's D reflection. I found the answer on quizlet.
https://quizlet.com/127051840/chapter-12-sound-flash-cards/
That is the link to the quizlet.

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3 years ago

Explain it to you or more sentences using your own words what you learned about biomes organisms and populations

andrezito [222]

A biome is a large area characterized by its vegetation, soil, climate, and wildlife. ... Marine biomes cover close to three-quarters of Earth's surface. Marine biomes include the ocean, coral reefs, and estuaries. Grasslands are open regions that are dominated by grass and have a warm, dry climate.

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2 years ago

The reaction of iron and water vapor results in an equilibrium3 Fe(s) + 4 H2O (g) ⇋ Fe3O4 (s) + 4 H2 (g) Kc = 5.0 at 800.°CWhat

labwork [276]

<u>Answer:</u> The equilibrium concentration of water is 0.1 M

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Given mass of hydrogen gas = 7.5 g

Molar mass of hydrogen gas = 2 g/mol

Volume of solution = 15.0 L

Putting values in above equation, we get:

$\text{Molarity of hydrogen gas}=\frac{7.5}{2g/mol\times 15.0}\\\\\text{Molarity of hydrogen gas}=0.25M$

For the given chemical equation:

$3Fe(s)+4H_2O(g)\rightleftharpoons Fe_3O_4(s)+4H_2(g)$

As, the reaction is initiated by hydrogen gas, the reaction will proceed backwards and the equilibrium constant will be the reciprocal of equilibrium constant for the given reaction.

Now, the reaction becomes:

$Fe_3O_4(s)+4H_2(g)\rightleftharpoons 3Fe(s)+4H_2O(g);K_c'$

Initial: 0.25

At eqllm: 0.25-4x 4x

We are given:

$K_c=5.0$

So, $K_c'=\frac{1}{5.0}=0.2$

The expression of $K_c'$ for above equation follows:

$K_c'=\frac{[H_2O]^4}{[H_2]^4}$

The concentration of pure solids and liquids are taken as 1 in the equilibrium constant expression.

Putting values in above equation, we get:

$0.2=\frac{(4x)^4}{(0.25-4x)^4}\\\\x=-0.126,0.025$

Neglecting the value of x = -0.126 because concentration cannot be negative.

So, equilibrium concentration of water = $4x=(4\times 0.025)=0.1M$

Hence, the equilibrium concentration of water is 0.1 M

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3 years ago

Plant cells have a strong, rigid outer layer known as the cell wall. The function of the cell wall is to -

alexgriva [62]

Answer:the third one/ regulates the transfer of material into and out of the cell.

Have a nice day

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3 years ago

Which event would be impossible to explain by using John Dalton's model of the atom<br>

lisov135 [29]

Answer:

we need the model to answer

Explanation:

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3 years ago