Basic Concepts
What is electrolysis
The process of using electricity to cause the decomposition of a compound.
Name all of the ions present in a solution of aqueous sodium chloride.
Na+, Cl-, H+, and OH-.
What is produced at the anode in molten sodium chloride electrolysis?
Chlorine Gas (Cl2)
do not accept any ions.
What is your chemistry teacher name?
Agustin
Water
H2O
Define an electrolyte.
The substance that conducts electricity when in solution or melted. (The compound being electrolysed)
What is produced at the cathode in copper (II) sulfate electrolysis?
Copper metal (Cu)
do not accept Cu2+ or any ion.
What is produced at the cathode in molten lead (II) bromide electrolysis?
Lead metal (Pb)
do not accept any ions
The mass of hydrogen is
One
Carbon dioxide
CO2
Name the two types of electrodes (identify each correctly)
Anode (positive)
Cathode (negative)
What gas is produced at the anode in dilute sulfuric acid electrolysis?
Oxygen gas (O2)
do not accept any ions.
Why are inert electrodes used in molten compound electrolysis?
Inert electrodes do not react with the electrolyte or products of electrolysis.
The mass of water is
18
Ammonia
NH3
What material can inert electrodes be made of?
Platinum or graphite
Why is hydrogen produced at the cathode in water electrolysis?
Hydrogen ions (H+) gain electrons at the cathode to form hydrogen gas (H2).
Accept balanced half equation:
2H+ + 2e- --> H2
What are electrodes typically made of when electrolysing molten aluminium oxide in the extraction of aluminium.
Graphite (carbon)
Why is it important to balance chemical equations?
To obey the law of mass conservation
Hydrogen Peroxide
H2O2
Why can molten ionic compounds conduct electricity?
Their ions are free to move to the electrodes.
Describe the process of electroplating.
Using electrolysis to deposit a thin layer of metal onto the surface of another metal (or conductive material).
Why is hydrogen gas produced at the cathode during electrolysis of molten sodium chloride?
trick question! muahaha
No H+ present in molten NaCl, so sodium metal will form at the cathode.
The formula of potassium nitrate is
KNO3
Reactants is a fuel cell?
Hydrogen and Oxygen