Chapter 6 Fuel cells

Question 1

Fuel cell

Answer 1

A type of galvanic cell that consists of a cathode, anode, porous electrode and an electrolyte. It converts chemical E into electrical E when reactants are continuously supplied.

Question 2

Galvanic cell

Answer 2

A voltaic cell which converts chemical E into electrical E

Question 3

Hydrogen economy

Answer 3

A proposed system of delivering energy for society using hydrogen as a source of E.

Question 4

Electrode

Answer 4

A solid conductor in a half-cell at which oxidation or reduction rxn occurs. (A material that has delocalised e- that can move throughout the circuit)

Question 5

Electrolyte

Answer 5

A chemical substance that conducts an electric current as a result of dissociation into +ve and -ve charged ions, which migrate to the +ve and -ve terminals of an electric circuit.

Question 6

Steam reforming

Answer 6

A process which produces hydrogen, carbon monoxide and other useful products from hydrocarbon fuels such as natural gas.

Question 7

Biogas

Answer 7

A mixture of gases produced by the breakdown of organic matter in the absence of energy. Mainly comprises of methane and CO2.

Question 8

Adsorb

Answer 8

The process of sticking molecules to the surface of a solid or a liquid

Question 9

Absorb

Answer 9

The process of incorporating a substance into the interior of another substance or object such as the absorption of water into a sponge

Question 10

Primary cell

Answer 10

A galvanic cell which is non-rechargeable because products of the reaction migrate away from the elctrode

Question 11

Secondary cell

Answer 11

A rechargeable cell because products formed as a result of discharge reactions stay in contact with the electrodes in a convertible form.