Quiz 3

EIS systems characterize the time response of chemical systems using low amplitude ________________ over a range of frequencies

• DC voltages

• ac voltages

• DC currents

• ac currents

What information can be obtained from Electrochemical Impedance Spectroscopy Nyquist Plot?

• conductance

• phase angle

• impedance

• frequency

Using Simplified Randles Cell model, the ____________ can be determined by reading the real axis value at the high frequency intercept.

• polarization resistance

• double layer capacitance

• charge transfer resistance

• solution resistance

The potentiostat controls the potential of the _______ electrode relative to the _______ electrode

• reference, working

• counter, reference

• working, reference

• working, counter

A potentiostat measures current between the working and ________ electrodes.

• counter

• reference

• control

• ground

The capacitance of double layer is depends on these factors EXCEPT:

• electrode size

• temperature

• ionic concentration

• electrode roughness

The Warburg Impedance is visible in the Nyquist plot as a straight line with a _________ angle to the x-coordinate axis.

• 90 °

• 45 °

• 60 °

• 30 °

This nyquist plot can be modeled by which equivalent circuits?

• 
• 
• 
• 

Which one of the following is a disadvantage of ISFET?

• Low cost

• Stable output

• Requires a very small amount of biological material

• Temperature sensitive

At ________ frequencies, the Warburg impedance is _______ because diffusing reactants do not have to travel far towards the electrode.

• low, large

• high, small

• high, large

• low, small