Metals Flashcards
Metal + Oxygen ->
Metal oxide
Metal + water ->
Metal Hydroxide + hydrogen
Metal + acid ->
Salt + hydrogen
Very reactive metals must be extracted from their ores via…
Electrolysis
Chemical test for hydrogen
Burns with a pop
Reactive metals can be extracted from their ores via
Heating with carbon
Unreactive metals can be extracted from their ores via
Heating alone
What type of metal pairs generate higher voltages in the ECS?
Far apart in the ECS
What is the direction of electron flow in the Electrochemical cells?
From metal higher in the ECS to metal lower in the ECS
(Remember - electron flow down)
Describe the structure of a metal lattice
Positive metal ions surrounded by delocalised electrons
Metallic bond
Electrostatic attraction between positive metal ions and delocalised ions
Displacement reaction
A reaction in which a more reactive metal displaces a less reactive metal from a compound
E.g. Mg + FeSO4 -> MgSO4 + Fe
What allows metals to conduct electricity?
Delocalised electrons
(Charged particles + free to move)
Why must a d.c. supply be used during electrolysis?
So that the products can be identified.
Redox reaction
A reaction involving a transfer of electrons
(One reactant loses electrons, the other gains them)
Loss of electrons
Oxidation
Gain of electrons
Reduction
Oxidation
Loss of electrons
Reduction
Gain of electrons
How do you turn this reduction equation into an oxidation equation?
Cu^2+ + 2e- -> Cu
Reverse it
Cu -> Cu^2+ + 2e-
What is the purpose of the ion bridge?
Completed the circuit
(Or allows ions to flow)
