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zheka24 [161]
2 years ago
7

Provide any explanation at the subatomic level for how flame color is produced. Your answer should include a discussion of the e

nergy input and energy output, the atomic energy levels, and movement of electrons.
Chemistry
1 answer:
weeeeeb [17]2 years ago
3 0

Answer:

The flame provides an input of energy. It excites electrons in the material that is being burned. These electrons get promoted to a higher atomic energy level. When they return to a lower energy level, they release energy in the form of light (an output of energy.) The frequency of the light depends on the energy difference between the initial and final energy level of the electron. The color of the flame depends on the frequency of the emission.

Explanation:

There are multiple electron energy levels within an atom. During most of the time, electrons in an atom stay in levels with the lowest potential energy possible. However, when the atom gets heated (e.g., over a flame,) electrons will gain energy from the flame and move to levels of higher potential energy.

As more electrons get promoted, some will eventually fall back to their initial energy level. Electron energy levels in an atom are quantized. In other words, the energy difference between two levels is a definite value, and that no electron can exist between two energy levels.

Energy conserves. These potential energy needs to go somewhere. In the case of an electron transition, the potential energy that has been lost will be released as an electromagnetic emission. Keep in mind that only one photon will be released for each transition. That photon will account for all the potential energy differences \Delta E. The Planck-Einstein Relation gives the frequency \nu of that photon. That's the same as the frequency of the beam of light that is observed.  

\displaystyle \nu = \frac{\Delta E}{h},

where h is Planck's Constant.

The frequencies of most of these transitions are in the infrared region of the spectrum. If there are more than one few visible emissions, these emissions combine to produce a distinct flame color.

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Answer:

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2 years ago
An aqueous solution of glucose has molality of 6.81 and a density of 1.2 g/ml what is the molarity of glucose in the solution
andriy [413]

Answer:

the molarity is 3.68 moles/L

Explanation:

the molality of the solution of sucrose is

m= moles of glucose / Kg of solvent (water)= 6.81 ,

since the molecular weight of glucose is 180.156 gr/mole , then per each kilogram of solvent there is

6.81 moles*180.156 gr/mole + 1000 gr of water = 2226.86 gr of solution

from the density

volume of solution = mass of solution/density = 2286.86 gr / 1.2 gr/ml = 1855.71 ml

therefore there is 1000 gr of water in 1855.71 ml

then the molarity M is

M= moles of glucose / L of solution = (moles of glucose /  Kg of solvent) *  (Kg of solvent/L of solution) = 6.81 moles/Kg * 1Kg/1.85 L = 3.68 moles/L

M= 3.68 moles/L

Note:

- Would be wrong in this case to assume density of water = 1 Kg/L since the solution is heavily concentrated in glucose and therefore the density of water deviates from its pure value.

3 0
3 years ago
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Answer:

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Explanation:

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