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Kay [80]
3 years ago
5

When is the absorption spectrum of an electron generated?

Chemistry
2 answers:
KengaRu [80]3 years ago
6 0
<h3><u>Answer;</u></h3>

A. when an electron in an atom is excited to a higher energy state

<h3><u>Explanation</u>;</h3>
  • Lines on the atomic spectrum are based on the electron transitions between energy levels, such that when an electron drops an energy level a photon is released resulting in an emission line and when an electron absorbs a photon and rises an energy level an absorption line is observed on the spectrum.
  • Therefore; an absorption spectrum is a spectrum of absorption lines or bands  which occurs when electrons move to a higher orbit by absorbing energy. Each atom has a unique spacing of orbits and can emit or absorb only certain energies or wavelengths.
Dvinal [7]3 years ago
3 0
<span>The atomic absorption spectra is created when light passes through gaseous elements and atoms</span>
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Bas_tet [7]
A thermometer because it is the only tool that measures temperature.
3 0
3 years ago
Read 2 more answers
As an FDA physiologist, you need 0.625 L of phosphoric acid acid / dihydrogen phosphate (H3PO4 (aq) / H2PO4 - (aq) ) buffer with
aksik [14]

Answer:

0.4058L of 1.0M H3PO4

0.2192L of 1.5M NaOH

Explanation:

The pKa of the H3PO4 / H2PO4- buffer is 2.12

To solve this question we must use H-H equation for this system:

pH = pKa + log [H2PO4-] / [H3PO4]

2.75 = 2.12 +  log [H2PO4-] / [H3PO4]

0.63 = log [H2PO4-] / [H3PO4]

<em>4.2658 = [H2PO4-] / [H3PO4] (1)</em>

Where [] could be taken as the moles of each reactant

As you have H3PO4 solution, the reaction with NaOH is:

H3PO4 + NaOH → H2PO4- + Na+ + H2O

As you can see, both H3PO4 and H2PO4- comes from the same 1.0M H3PO4 solution

The moles of H3PO4 are:

[H3PO4] = Moles H3PO4 - Moles NaOH

And for H2PO4-:

[H2PO4-] = Moles NaOH added

Replacing in (1):

4.2658 = [Moles NaOH] / [Moles H3PO4 - Moles NaOH]

4.2658 Moles H3PO4 - 4.2658 moles NaOH = Moles NaOH

4.2658 Moles H3PO4 = 5.2658 moles NaOH <em>(1)</em>

<em></em>

In volume:

0.625L = Moles H3PO4 / 1.0M + Moles NaOH / 1.5M

0.625 = Mol H3PO4 + 0.6667 Moles NaOH <em>(2)</em>

Replacing (2) in (1):

4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4 / 0.6667)

4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4) / 0.6667

4.2658 Moles H3PO4 = 5.2658*(0.9375 - 1.5 mol H3PO4)

4.2658 Moles H3PO4 = 4.9367 -7.8983 mol H3PO4

12.1641 mol H3PO4 = 4.9367

Mol H3PO4 = 0.4058moles * (1L / 1.0moles) =

0.4058L of 1.0M H3PO4

And:

0.625L - 0.4058L =

0.2192L of 1.5M NaOH

5 0
3 years ago
A pumpkin has a volume of 10 cm and a mass of 8 g. what is the density of the pumpkin​
cricket20 [7]

Answer: 0.8g/cm^3

Explanation:

In seeing your problem, I see an issue with your units for centimeter. The volume is in the third dimension, so we use cm^3 every single time for the volume. That way, we can arrive to the correct density (in g/cm^3)

Density = mass/volume and so

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7 0
3 years ago
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baherus [9]
I don’t get it what do u need exactly?
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lbvjy [14]

Answer:

C). The structures in the cell work together to perform its life functions.

Explanation:

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3 years ago
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