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Peaks in UV-vis spectroscopy are wide beacuse the signal results from transitions to excited electronic levels and their respective vibretional, as well as rotational levels

Select the correct answer(s).  

(0/0)

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Partly true

False

True

none

What is Resonance Fluorescence?

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(0/0)

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when another molecule is in an excited state ad transfer its energy to an excited electronic state of the analyte, which then emits light

absoption of a photon with energy equal to that of the resonance frequency of a bond vibration

Increase in fluorescen intensity due to a large number of aromatic rings

when resonant ocnjugated bonds transfer energy to a long lived excited state resulting in phosporescence

Immediate re-emission of absorbed light in which the emittes photons have the same wavelenght as the absorbed photons

none

Red light prhotons have a shorter wavelength tha infrared photons

Select the correct answer(s).  

(0/0)

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True

False

none

This instrument can be used to acquire both the excitation and the emission spectrum of a photoluminescent molecule

Select the correct answer(s).  

(0/0)

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Phosphorimeter

Spectrophotometer

Excitometer

Spectrofluorometer

Spectroscope

Fluorimeter

none

UV-VIs, fluorescence and phosphorescence are based on the same type of energy transition in molecules and provides exactly the same information

Select the correct answer(s).  

(0/0)

---

false

Partly true

none

which of the following analytitcal techniques do not require a ligth source as part of the instrumentation ?

Select the correct answer(s).  

(0/0)

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Atomic Emission spectroscopy

Chemiluminescence

Phosphorescence

UV-vis spectroscopy

Fluorescence

Atomic Absorption Spectroscopy

none

CONNECT WITH THE COLUMS CAN BE USED FOR THE TYPE OF SAMPLE OR ANALYSIS STATED

Match the text (click and drag)   

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Check Order Of Answers

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Match the text
Quantification of certain organic compounds
Quantifying metals that do not form colored complexes
Identifying analytes that emit light after a chemical reaction puts them in an excited state
Identifying analytes that emit light after being excited by photon absorption
Characterization of photoluminescent nanostructures
Establish whether a sample is free of impurities
Elemental composition of a sample
Quantifying metals that form colored (but not luminescent) complexes
Simultaneous identification of many elements -
Quantifying metal that show ligth emission or form complexes that do

Click and drag
FLuo, Phos
UV-VIS, CL
ICP-AES -
FLUO, PHOS, ¿AAS, ICP-AES, ?
AAS, ICP-AES
CL
AAS, ICP-AES, UV-VIS
AAS, ICP-AES
AAS, ICP-AES, UV-VIS
UV-VIS, PHOS

Check Order of Answers

none

which og the following statements are true refgarding "stokes shift"?

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Accompanied by a jump of the e- to a higher electronic or vibrational level due to collisions with the solvent

The emission peak has a longer wavelength than the absorption peak

emission peak has a shorter wavelegth than the absoption peal

result of energy losses by vibrational relaxation due to collision or othe factors

Happens due to a change in spin of the excited electron

none

Which environmental factors have noticiable effect on fluorescence intensity?

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(0/0)

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dissolced oxygen

Atmospheric pressure

pH

Temperature of the solution

Type of the curvette

Type of solvent

none

blue light photons have higher energy than ultraviolet photons

Select the correct answer(s).  

(0/0)

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False

True

Partly tru

none

Cooling of a sample or inmobilization of the nalyte in a solid support is useful to increase the quantum yield of chemiluminescence

Select the correct answer(s).  

(0/0)

---

Partly true

False

True

none

The only difference between Fluorescenc and Phosphorescence is the time it takes for a photon to be emitted

Select the correct answer(s).  

(0/0)

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False

True

Partly true

none

Whys is a plasma torch ususally better for atomic emission analysis than a flame?

Select the correct answer(s).  

(0/0)

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the plasma provides a reducing environment, neutralizing ions

The plasma gas reacts with impuritis binding them to prevent interference

It does not require a nebulizer

atomization of the sample is better in the plasma

the cost of plasma AES are lower than for flame AAS

temperatures is higher in the plasma

none

Which of the following statements are true regarding beer Law

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(0/0)

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The molar absorptivity ter depends only on the chemical species being analyzed and is independent of other factors

The equation also contains contributions from Lambert and Bouguer

it shows a linear relation of transmittance to concentration

Only aplies in UV-vis spectroscopy

it is a lnear relationship only for a certain concentration range

It is implies that increasing the optical path (with a longer cuvette) can allow to mesuare lowe concentrations

none

An object that looks black to the human eye must absorb all wavelength in the visible spectrum, but may be a perfect reflector of ultraviolet or infrered

Select the correct answer(s).  

(0/0)

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Partly true

True