Flashcards in C2C - Extracting Metals Deck (39):
How can copper be extracted ?
Heating copper ore with carbon
Why after extraction can copper not be used ?
It's not pure enough
What's the problems with unpure copper ?
It won't conduct very well
What is the name of the process in which pure copper is obtained ?
What does electrolysis mean ?
The splitting up of something using electricity
What is the copper immersed in ?
A liquid called the electrolyte which conducts electricity
What are electrolytes ?
Free ions dissolved in water
In the electrolysis what is the electrolyte ?
Copper sulfate solution
What kind of ions does copper sulfate solution contain ?
What actually happens during electrolysis ?
1) electrons from copper atoms are pulled off at the anode. Causing them to go back into the solution as Cu2+ ions
2) electrons are offered at the cathode to nearby Cu2+ ions which turns them back into copper atoms
3) the impurities are dropped at the anode as sludge whilst pure copper atoms bond to the cathode
The cathode is the -------- electrode ?
Pure copper is what at the cathode ?
What is reduction ?
The gain of electrons or the removal of oxygen
Where does reduction take place ?
At the cathode
The positive electrode is called ?
What happens to copper at the anode ?
What is oxidation ?
The loss of electrons / the addition of oxygen
Where does oxidation take place ?
What gains mass during electrolysis ?
What loses mass during electrolysis ?
What are the benefits of recycling copper rather than just mining for more ?
1) cheaper to recycle than it is to mind and extract
2) only using 15% of energy that would be used to mine the same amount
What can an alloy be ?
A mixture of two or more different metals or a mixture of a metal and non metal
Why would an alloy be more useful than the pure metal ?
They have properties that are different from the pure metal usually making them more useful
What is steel an alloy of ?
Iron and Carbon
Why would we rather have steel than just iron ?
It's harder and stronger
Why would we add carbon to the iron ?
Iron on its own will corrode quickly so adding a bit of carbon to make it into steel makes a big difference
Name 3 things made from steel ?
Copper and zinc make what alloy ?
How would you describe the properties of brass ?
Just a mixture of copper and zinc but a lot harder
What is brass used for ?
What is bronze an alloy of ?
Copper and Tin
Properties of bronze are ?
More resistant to corrosion
What is solder an alloy of ?
Lead and tin
Why is solder useful for soldering things ?
Because unlike pure metals it doesn't have a definite melting point. It just gradually solidifies as it cools down
What does the alloy amalgam contain ?
What's a large scale use of amalgam ?
What is the name for the family of smart alloys ?
When Jack sits on his glasses they go back to the original shape. How ?
Made of nitinol which has shape memory