Spectrochemical Analysis 2

What is the principle behind UV-Visible spectroscopy?

• Electronic transitions between energy levels in molecules

• Thermal vibrations of molecules

• Gravitational interactions between molecules

• Chemical reactions between molecules

How does infrared spectroscopy work?

• Infrared spectroscopy measures the emission of ultraviolet radiation by molecules.

• Infrared spectroscopy measures the absorption of infrared radiation by molecules to identify functional groups.

• Infrared spectroscopy measures the absorption of visible light by molecules.

• Infrared spectroscopy measures the reflection of X-rays by molecules.

Explain the concept of atomic absorption spectroscopy.

• Atomic absorption spectroscopy is a method to quantify the concentration of elements in a sample by measuring the absorption of light at specific wavelengths.

• Atomic absorption spectroscopy involves measuring the electrical conductivity of elements in a sample.

• Atomic absorption spectroscopy is a method to determine the mass of elements in a sample.

• Atomic absorption spectroscopy is used to measure the emission of light at specific wavelengths.

What is the difference between emission and absorption spectroscopy?

• Emission spectroscopy measures emitted light, absorption spectroscopy measures absorbed light.

• Emission spectroscopy measures emitted heat, absorption spectroscopy measures absorbed heat.

• Emission spectroscopy measures emitted sound, absorption spectroscopy measures absorbed sound.

• Emission spectroscopy measures absorbed light, absorption spectroscopy measures emitted light.

Discuss the applications of Raman spectroscopy.

• Raman spectroscopy has no practical applications

• Raman spectroscopy is primarily used in cooking

• Raman spectroscopy is only used in astronomy

• Raman spectroscopy finds applications in material science, pharmaceuticals, forensics, environmental analysis, and biological research.

What is the significance of NMR spectroscopy in chemical analysis?

• NMR spectroscopy helps in baking cakes

• NMR spectroscopy is used for weather forecasting

• NMR spectroscopy is primarily used in space exploration

• NMR spectroscopy provides detailed information about the structure, purity, and chemical environment of molecules.

Describe the working principle of mass spectrometry.

• Mass spectrometry involves only separation of ions based on their mass-to-charge ratio.

• Mass spectrometry does not involve ionization of ions.

• Mass spectrometry involves ionization, separation, and detection of ions based on their mass-to-charge ratio to produce a mass spectrum.

• Mass spectrometry detects ions based on their size rather than mass-to-charge ratio.

How is fluorescence spectroscopy used in analytical chemistry?

• Fluorescence spectroscopy is used to determine the boiling point of a sample

• Fluorescence spectroscopy is used to measure the weight of a sample

• Fluorescence spectroscopy is used to analyze the fluorescence emitted by a sample when excited by light of a specific wavelength.

• Fluorescence spectroscopy is used to analyze the magnetic properties of a sample

Explain the term 'spectral resolution' in the context of spectroscopic techniques.

• Spectral resolution is related to the intensity of the spectral lines

• Spectral resolution in spectroscopic techniques refers to the ability to distinguish between closely spaced spectral lines.

• Spectral resolution is the ability to measure the temperature of the sample

• Spectral resolution refers to the color range covered by the spectroscopic technique

Discuss the advantages and limitations of using spectroscopic methods in chemical analysis.

• Low sensitivity and destructive nature

• Advantages include high sensitivity, non-destructive nature, qualitative and quantitative information. Limitations include calibration needs, interference from impurities, and skilled operator requirement.

• No need for calibration and no interference from impurities

• Skilled operator not required and only qualitative information provided