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Ksju [112]
2 years ago
8

Which BEST explains why the sun appears reddish at sunrise? A) Blue wavelengths of light have already been scattered before reac

hing the observer. B) Red wavelengths of light have already been scattered before reaching the observer. C) The sun emits light rays comprised of higher wavelengths at sunrise. D) The sun emits light rays comprised of lower wavelengths at sunrise.
Chemistry
1 answer:
romanna [79]2 years ago
7 0
<span>The answer is A. This is because sunlight is composed of various wavelengths in the electromagnetic spectrum. In the visible light spectrum, red light has a higher frequency (lower wavelength) than blue light that has a lower frequency (higher wavelength). Therefore red light has higher energy than blue light hence able to penetrate more into the atmosphere before scattering, compared to blue light. At sunrise and sunset, due to the relative angle  of the sun to the observer, the sun rays have to penetrate a thicker layer to the atmosphere before reaching the observer</span>




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A solution is made by mixing 0.82 grams of sodium acetate, 1 mL of 12 M acetic acid (pKa=4.76) and water to give a final volume
kompoz [17]

Answer:

This solution acts as an efficient buffer

Explanation:

the pH of a buffer solution can be described like this: pH=pKa+log\frac{[base]}{[acid]}

[acid]=[acetic acid]=1mL.\frac{12mol}{1000mL} . \frac{1}{1L} = 0.012M

[base]=[sodium acetate]=0.82g.\frac{1mol}{82g} .\frac{1}{1l} = 0.01M

replacing, pH=4.76+log\frac{0.01M}{0.012M} =4.84

If we add an acid, pH will decrease a little bit and if we add a base, pH wil increase a little bit.

lets supose that we change the rate by increasing [base] to 0.1, then

pH=4,76+log\frac{0.1}{0.012} = 5.68

and now lets supose that we increase [acid] to 0.1 pH=4.76+log\frac{0.01}{0.1} = 3.76

Big changes in concentration of base or acid doesn´t produce big changes in pH, in that way the mix of sodium acetate with acetic acid is a good buffer solution.

4 0
2 years ago
Four students presented different analogies to describe the formation of an ionic bond.Student A: A tug of war between seven mid
MissTica

Answer:

The answer is A

Explanation:

I took the test

6 0
2 years ago
Write a summary of a toms​
Dmitrij [34]

atoms consist of protons and neutrons in the nucleus , surrounded by electrons that reside in orbitals . Orbitals are classified according to the four quantum number s that represent anyone particular orbitals energy , shape , orientation and the spin of the occupying electron.

hope this helps xx

3 0
3 years ago
If one molecule of glucose (C6H120) reacts completely with three molecules of oxygen (O2), what is the TOTAL number of atoms
nalin [4]

Answer : The total number of atoms in the product are, 36 atoms.

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

When 1 molecule of glucose reacts completely with 3 molecules of oxygen then it react to give 6 molecules of carbon dioxide and 6 molecules of water.

The balanced chemical reaction will be:

C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O

There are 3 atoms in carbon dioxide and 3 atoms in water.

Total number of atoms in the product = 6(3) + 6(3) = 36 atoms

Thus, the total number of atoms in the product are, 36 atoms.

5 0
3 years ago
What is the volume of an object with a mass of 31g and density of 444g/ml​
Tanzania [10]

Answer:

<h2>The answer is 0.07 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density} \\

From the question

mass = 31 g

density = 444 g/mL

We have

volume =  \frac{31}{444}   \\  = 0.06981...

We have the final answer as

<h3>0.07 mL</h3>

Hope this helps you

5 0
2 years ago
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