Analytical Exam 4

Front

What is XPS?

Back

X-ray Photoelectron Spectroscopy (XPS) is a surface analysis technique used to detect impurities and oxides on an electrode surface by measuring the elemental composition and chemical state of the materials.

Front

What is non-faradaic current?

Back

Non-faradaic current is the current that flows due to changes in potential difference between two terminals of a capacitor, without any charge transfer occurring at the electrode surface.

Front

What is an electrolytic cell?

Back

An electrolytic cell is a type of electrochemical cell that consumes electrical energy to drive a non-spontaneous chemical reaction.

Front

What does a red line indicate in electrochemical analysis?

Back

In electrochemical analysis, a red line often indicates the greatest scan rate among different colored lines representing various scan rates.

Front

What is the main mode of mass transport in a thin film on an electrode?

Back

In a very thin film on an electrode, the main mode of mass transport of an electroactive molecule in a 0.1 M KNO3 solution is diffusion.

Front

Define electroactive molecule.

Back

An electroactive molecule is a chemical species that can undergo oxidation or reduction reactions at an electrode surface.

Front

What is the purpose of surface analysis in electrochemistry?

Back

The purpose of surface analysis in electrochemistry is to understand the composition, structure, and properties of electrode surfaces, which can affect the performance of electrochemical reactions.

Front

Explain the term 'scan rate' in electrochemical measurements.

Back

Scan rate refers to the speed at which the potential of an electrochemical cell is varied during a measurement, typically expressed in volts per second.

Front

What is the significance of impurities on an electrode surface?

Back

Impurities on an electrode surface can significantly affect the electrochemical reactions, leading to changes in efficiency, selectivity, and overall performance.

Front

What is the role of KNO3 in electrochemical experiments?

Back

KNO3 (potassium nitrate) is often used as an electrolyte in electrochemical experiments to provide ionic conductivity in the solution.