WorksheetsConcepts Quiz: Electrochemistry: How do we transport energy?
Total questions: 25
Worksheet time: 27mins
Electrochemistry is the area of chemistry concerned with the inter-conversion of ______ and ______ energies
Mechanical, Chemical
Chemical, Electrical
Electrical, Mechanical
Chemical, Electrochemical
Electrochemical cells require charge carriers: (1) two electrodes which are ____ carriers and (2) an electrolyte which is an ____ carrier
Hole, Electron
Ion, Electron
Electron, Ion
Electron, Hole
Electrochemical reactions are...
Homogeneous processes
Heterogeneous processes
Spontaneous processes
Nonspontaneous processes
Three-electrode cells use this electrode to accurately measure and compare the potential
Working Electrode
Quasi-stable Electrode
Reference Electrode
Counter Electrode
The surface area of the counter electrode must be _____ than the area of the working electrode
Equal
Larger
Smaller
What is a potentiostat? Why do we use it in electrochemistry?
Electrochemical water splitting consists of two reactions:
Oxygen reduction reaction (ORR)
Hydrogen evolution reaction (HER)
Hydrogen oxidation reaction (HOR)
Oxygen evolution reaction (OER)
Bubble dissipation becomes important at _____ current densities
High
Low
A catalyst increases the ______ by decreasing the ______ through a new reaction mechanism
reaction rate, temperature
temperature, reaction rate
reaction rate, activation energy
activation energy, reaction rate
Draw a potential energy diagram comparing reactions with and without a catalyst
The _______ establishes that catalyst-substrate interactions must be “just right” in terms of binding energy
Le Chatelier's principle
Sabatier Principle
Pre-catalytic effect
Faraday's Law
A catalyst must be:
Stable
Highly active
Inexpensive
Selective
Fuel cells convert a ____ (chemical energy) into _____ (electrical energy)
Bond, Electron
Fuel, Electricity
Fuel, Charge
Electron, Ion
Which of the following is true about fuel cells?
Power is defined by the fuel reservoir
Power is defined by the fuel cell size
Capacity is defined by the fuel reservoir
Capacity is defined by the fuel cell size
Which irreversible losses affect the performance of fuel cells?
Activation
Total cost
Concentration (mass transfer)
Ohmic (electrical resistance)
Capacity fade
Only hydrogen produced from water electrolysis is truly clean...
True
False
Which energy source has the greatest potential?
Nuclear
Oil, gas and coal
Solar
Hydro
Batteries are electrochemical ____ devices
Electrolysis
Storage
Conversion
Charge accumulation
Batteries are ____ devices, while fuel cells are ____ devices
Open, closed
Spontaneous, nonspontaneous
Nonspontaneous, spontaneous
Closed, open
The output voltage is defined by the amount of Li+ that can be stored
True
False
Overall battery performance is mainly limited by the electrolytes
True
False
Metal-air batteries contain a ____ anode and an ____ cathode
Metal, air-breathing
Intercalation, metal-air
Air-breathing, metal
Metal-air, intercalation
Which electrocatalytic reaction(s) mainly limit(s) air-breathing cathodes in metal-air batteries?
ORR
HER
OER
HOR
Write down the most important applications of electrochemical energy devices!
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