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2 years ago

What is the application of the emission spectra regarding elements?

1 answer:

8 0

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum. Each element's emission spectrum is unique. Therefore, spectroscopy can be used to identify elements in matter of unknown composition. Similarly, the emission spectra of molecules can be used in chemical analysis of substances.

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Olin [163]

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3 0

3 years ago

In which of the following is the number of neutrons correctly represented? A. fluorine: atomic number 9, mass 19, neutrons 0 B.

Digiron [165]

D. uranium: atomic number 92, mass 238, neutrons 146

238-92=146

4 0

3 years ago

Read 2 more answers

Which describes an object in projectile motion?

k0ka [10]

Answer:

Flying

Explanation:

6 0

3 years ago

When 1 mol each of C2H5OH and CH3CO2H are allowed to react in 1 L of the solvent dioxane, equilibrium is established when 13 mol

taurus [48]

Answer:

Keq = 4

Explanation:

The correct statement is:

When 1 mol each of C₂H₅OH and CH₃CO₂H are allowed to react in 1 L of the solvent dioxane, equilibrium is established when 1/3 mol of each of the reactants remains. Calculate the equilibrium constant for the reaction. (Note: Water is a solute in this reaction.)

1. Equilibrium equation

C₂H₅OH + CH₃CO₂H ⇄ CH₃CO₂C₂H₅ + H₂O

↑ ↑ ↑ ↑

ethanol acetic acid ethyl acetate water

2. Equilibrium constant

Keq = [Products] / [Reactants], each raised to tis stoichiometrical coefficient.

Since water is also a solute in this reaction (the solvent is dioxane) its concentration will appear in the equilibrium constant.

$Keq=\frac{[CH_3CO_2C_2H_5]\cdot [H_2O]}{[C_2H_5OH]\cdot [CH_3CO_2H]}$

3. Equlibrium concentrations:

Moles

C₂H₅OH + CH₃CO₂H ⇄ CH₃CO₂C₂H₅ + H₂O

Initial 1 1 0 0

Change -2/3 -2/3 +2/3 +2/3

End 1/3 1/3 2/3 2/3

Since the volume is 1 liter, the concentration is equal to the number of moles

4. Calculations:

$Keq=\frac{[CH_3CO_2C_2H_5]\cdot [H_2O]}{[C_2H_5OH]\cdot [CH_3CO_2H]}=\frac{2/3\cdot 2/3}{1/3\cdot 1/3}=4$

4 0

3 years ago

Is Iodine a liquid?If yes then why Bromine is only given as a liquid non-metal?

Gnoma [55]

You can never say that any substance is a liquid, a solid, or a gas. Every substance you name can be all of those, depending on the TEMPERATURE.

At standard pressure . . .

-- Iodine is solid below 113.7°C, and gas above 184°C .

-- Bromine is solid below -7.2°C, and gas above 58.8°C .

-- "Room temperature" is considered to be the range from 20°C to 23.5°C.

-- Iodine is solid in that range.

-- Bromine one of only two elements that are known to be liquids AT
ROOM TEMPERATURE. The other one is mercury ... a metal.

3 0

2 years ago