11C Applications of Redox Flashcards
What are galvanic cells?
Simple circuits that use redox reactions to generate electricity from chemical energy
What is the anode?
Negatively charged electrode where oxidation occurs
What is a cathode?
Positively charged electrode in a galvanic cell where reduction occurs
What does the salt bridge do?
Separates the half-cells and maintains neutral charge
Where does the electrical current flow to?
The anode’s electrons flow towards the cathode’s
What happens to the anode in a metal displacement reaction?
Excess element is formed at the anode
What happens to the cathode in a metal displacement reaction?
Excess of the solution is formed at the cathode
What is the salt-bridge’s purpose?
the cations move toward to the cathode while the anions move to the anode
What is corrosion?
Occurs when metals react with gases in the atmosphere to form a more stable compound
What is dry corrosion?
reacts directly with oxygen
What is wet corrosion?
metal reacts with oxygen in the presence of water
What is sacrificial protection?
It is a way to prevent corrosion where a readily oxidised metal is attached to a less active metal.
The sacrificial anode is then corroded instead of the protected metal
What is galvanising?
Applying a coating of a zinc onto the metal to physically block water and air, and chemically offering cathodic protection
