C2c-metals And Alloys Flashcards
What is reduction?
The removal of oxygen from a substance
Why is recycling copper cheaper than extracting it from its ore?
Saves resources
Uses less energy
What are the disadvantages of recycling copper?
You have to sort out copper from all other waste metals
Takes time and energy
What is electrolysis?
Splitting up with electricity
What happens in the electrolysis of copper?
Impure copper as anode+ Pure copper as cathode- Copper sulfate solution as electrolyte Cathode gains mass because copper is deposited Anode loses mass as copper dissolves
What happens at the cathode?
Reduction because electrons are gained
What happens at the anode?
Oxidation because electrons are lost
What is the half equation for the reaction at the cathode?
Cu2+ + 2e- –> Cu
What is the half equation for the reaction at the anode?
Cu –> Cu2+ + 2e-
What are alloys?
Mixtures containing one or more metal elements
What metal is amalgam made out of and uses?
Mercury
Tooth fillings
What metals is brass made out of and uses?
Copper and zinc
Musical instruments
Coins
door knockers
What metals make solder and uses?
Lead and tin
Used to join electrical wires
How does nitinol have shape memory?
Used to make spectacle frames
Return to original shape after bending
How can copper be extracted?
By heating its ore with carbon
