SCL ELECHEM

1.      What is a potentiostat ?

•     A device to measure the current and potential of the electrolyte in a electrochemical cell

•   A electronic device that measures and controls the potential (or voltage) difference between two electrodes

•      A device to control the rate at which electrode processes occurs

    What are some of the main characteristics of a potentiostat ?

•      Voltage control

•      Current measurement

•    Heat control

    Some of the control modes of a potentiostat is a mixed mode and galvanostatic mode

• True

• False

   What is an operational- amplifier (OP-AMP) ?

•      A mechanical amplifier that increases the output of current running through it

•      A special circuit that is design to prevent large amount of current from running into the system

•    A electronic circuit component powered by a DC voltage capable of amplifying an input voltage

   Feedback mechanism refers to a process where energy stored in the capacitor of a circuit is reuse to increase output voltage.

• True

• False

Oxidation reaction occurs at the

• anode

• cathode

• electrolyte

• external circuit

What is the function of a salt bridge?

• o prevent charge buildup

• to complete the circuit

• to allow the flow of electrons from anode to cathode

Why is oxygen removed from electrochemical cell before any measurement?

• oxygen is an electroactive species

• oxygen will act as catalyst for the reactions

• oxygen falls into group 16 in the peroidic table

• oxygen participates in undesired redox or hydrolysis reactions

Faraday cage works on the principle of

• conservation of energy

• thermodynamics

• electromagnetic shielding

• quantum mechanics

Which are the main functions of a faraday cage?

• to protect the contained object from both static and non-static electromagnetic waves

• to redistribute electrostatic charges to external environment

• to encourage the flow of charges and speed up the rate of reaction