Instrumental Methods Quiz - CHE303

What is the main principle behind chromatography techniques?

• Equal distribution between stationary and mobile phases

• Absorption of analytes by the stationary phase

• Temperature control of the mobile phase

• Differential partitioning between stationary and mobile phases

Which spectroscopy method is commonly used for identifying unknown compounds based on their absorption of light?

• Nuclear Magnetic Resonance Spectroscopy

• Infrared Spectroscopy

• Mass Spectrometry

• Ultraviolet Spectroscopy

What is the key aspect of electrochemical analysis in terms of studying chemical reactions?

• Measurement of electrical signals

• Pressure monitoring

• Color analysis

• Temperature measurement

How does mass spectrometry differentiate between ions based on their mass-to-charge ratio?

• Mass spectrometry separates ions based on their color-to-charge ratio

• Mass spectrometry separates ions based on their mass-to-charge ratio by subjecting them to an electric or magnetic field, which causes the ions to be deflected differently depending on their mass.

• Mass spectrometry separates ions based on their size-to-charge ratio

• Mass spectrometry separates ions based on their shape-to-charge ratio

What type of information can be obtained from thermal analysis techniques?

• Physical and chemical properties of materials

• Color of the materials

• Historical background of the materials

• Geographical origin of the materials

Which microscopy technique uses a focused beam of electrons to visualize samples at high magnification?

• X-ray microscopy

• Photon microscopy

• Electron microscopy

• Neutron microscopy

In gas chromatography, what is the stationary phase typically made of?

• Polymer coating

• Metal support

• Glass material

• Solid material or liquid coated on a solid support

What is the purpose of a UV-Vis spectrophotometer in spectroscopy analysis?

• To analyze the color of the sample

• To determine the volume of the sample

• To measure the weight of the sample

• To measure the absorption or transmission of light by a sample as a function of wavelength.

How does cyclic voltammetry provide information about redox reactions?

• Cyclic voltammetry measures temperature changes during redox reactions.

• Cyclic voltammetry determines the color changes in redox reactions.

• Cyclic voltammetry counts the number of electrons transferred in redox reactions.

• Cyclic voltammetry analyzes the current response to applied potential sweeps to provide information about redox reactions.

What is the primary application of X-ray diffraction in material analysis?

• Studying mechanical properties of materials

• Determining crystal structure of materials

• Analyzing chemical composition of materials

• Measuring electrical conductivity of materials