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4 years ago

Where does the actual gas exchange happen?

Chemistry

1 answer:

katen-ka-za [31]4 years ago

4 0

Answer:

Option a. is correct.

Explanation:

Gas exchange refers to the the elimination of carbon dioxide from the bloodstream to the lungs and delivery of oxygen from the lungs to the bloodstream. The actual gas exchange happens in the lungs between the alveoli and capillaries (a network of tiny blood vessels). Capillaries are located in the walls of the alveoli.

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Determine the energy of 1.70 mol of photons for each of the following kinds of light. (Assume three significant figures.)PART A

BabaBlast [244]

<u>Answer:</u>

<u>For A:</u> The energy of the given amount of photons for infrared radiation is $1.271\times 10^5J$

<u>For B:</u> The energy of the given amount of photons for infrared radiation is $4.026\times 10^5J$

<u>For C:</u> The energy of the given amount of photons for infrared radiation is $1.355\times 10^6J$

<u>Explanation:</u>

The relationship between energy and frequency is given by Planck's equation, which is:

$E=n\rimes N_A\times \frac{hc}{\lambda}$ ......(1)

where,

h = Planck's constant = $6.62\times 10^{-34}Js$

E = energy of the light

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength of light

$N_A$ = Avogadro's number = $6.022\times 10^{23}$

n = number of moles of photons = 1.70 moles

Conversion factor used: $1m=10^9nm$

<u>For A:</u>

Wavelength of infrared radiation = $1600nm=1.6\times 10^6m$

Putting values in equation 1, we get:

$E=1.7\times 6.022\times 10^{23}\times \frac{6.62\times 10^{-34}\times 3\times 10^8}{1.6\times 10^{-6}}\\\\E=1.271\times 10^5J$

Hence, the energy of the given amount of photons for infrared radiation is $1.271\times 10^5J$

<u>For B:</u>

Wavelength of visible light = $505nm=5.05\times 10^7m$

Putting values in equation 1, we get:

$E=1.7\times 6.022\times 10^{23}\times \frac{6.62\times 10^{-34}\times 3\times 10^8}{5.05\times 10^{-7}}\\\\E=4.026\times 10^5J$

Hence, the energy of the given amount of photons for infrared radiation is $4.026\times 10^5J$

<u>For C:</u>

Wavelength of ultraviolet radiation = $150nm=1.5\times 10^7m$

Putting values in equation 1, we get:

$E=1.7\times 6.022\times 10^{23}\times \frac{6.62\times 10^{-34}\times 3\times 10^8}{1.5\times 10^{-7}}\\\\E=1.355\times 10^6J$

Hence, the energy of the given amount of photons for infrared radiation is $1.355\times 10^6J$

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4 years ago

We use yeast, seen below, when we make bread. Some warm water and a little sugar and yeast are ready to divide through budding.

marissa [1.9K]

The correct answer to this question is genetic reproduction

4 0

3 years ago

I need help with this answer

frez [133]

A
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7 0

4 years ago

A solution of nitrous acid and potassium nitrite acts as a buffer due to reactions that occur within the solution when a strong

Ghella [55]

Answer:

a. NO₂⁻ + H⁺ → HNO₂

b. HNO₂ + OH⁻ → NO₂⁻ + H₂O

Explanation:

A buffer is defined as an aqueous mixture of a weak acid and its conjugate base or vice versa.

The buffer of the problem is HNO₂/NO₂⁻ <em>where nitrous acid is the weak acid and NO₂⁻ is its conjugate base.</em>

a. When a acid is added to a buffer as the buffer of the problem, the conjugate base will react with the acid, to produce the weak acid, thus:

NO₂⁻ + HCl → HNO₂ + Cl⁻

Ionic equation is:

NO₂⁻ + H⁺ + Cl⁻ → HNO₂ + Cl⁻

In the net ionic equation, you avoid the ions that don't react, that is:

b. In the same way, the weak acid will react with the strong acid producing water and the conjugate base, thus:

HNO₂ + NaOH → NO₂⁻ + H₂O + Na⁺

The ionic equation is:

HNO₂ + Na⁺ + OH⁻ → NO₂⁻ + H₂O + Na⁺

And the net ionic equation is:

5 0

3 years ago

A combustion reaction occurs between one molecule of methane (CH4) and two molecules of oxygen (O,)

faltersainse [42]

Answer:

Explanation:

Because I carbon atom and 1 hydrogen atom plus 2

Oxygen atoms are needed

8 0

3 years ago