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Flashcards in C2C - Extracting Metals Deck (39):
0

How can copper be extracted ?

Heating copper ore with carbon

1

Why after extraction can copper not be used ?

It's not pure enough

2

What's the problems with unpure copper ?

It won't conduct very well

3

What is the name of the process in which pure copper is obtained ?

Electrolysis

4

What does electrolysis mean ?

The splitting up of something using electricity

5

What is the copper immersed in ?

A liquid called the electrolyte which conducts electricity

6

What are electrolytes ?

Free ions dissolved in water

7

In the electrolysis what is the electrolyte ?

Copper sulfate solution

8

What kind of ions does copper sulfate solution contain ?

Cu2+ ions

9

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

10

The cathode is the -------- electrode ?

Negative

11

Pure copper is what at the cathode ?

Deposited

12

What is reduction ?

The gain of electrons or the removal of oxygen

13

Where does reduction take place ?

At the cathode

14

The positive electrode is called ?

The anode

15

What happens to copper at the anode ?

It dissolves

16

What is oxidation ?

The loss of electrons / the addition of oxygen

17

Where does oxidation take place ?

Anode

18

What gains mass during electrolysis ?

Cathode

19

What loses mass during electrolysis ?

Anode

20

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

21

What can an alloy be ?

A mixture of two or more different metals or a mixture of a metal and non metal

22

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

23

What is steel an alloy of ?

Iron and Carbon

24

Why would we rather have steel than just iron ?

It's harder and stronger

25

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

26

Name 3 things made from steel ?

Bridges
Cutlery
Washing machines

27

Copper and zinc make what alloy ?

Bronze

28

How would you describe the properties of brass ?

Just a mixture of copper and zinc but a lot harder

29

What is brass used for ?

Musical instruments

30

What is bronze an alloy of ?

Copper and Tin

31

Properties of bronze are ?

Much harder
Much stronger
More resistant to corrosion

32

What is solder an alloy of ?

Lead and tin

33

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

34

What does the alloy amalgam contain ?

Mercury

35

What's a large scale use of amalgam ?

Filling teeth

36

What is the name for the family of smart alloys ?

Nitinol

37

When Jack sits on his glasses they go back to the original shape. How ?

Made of nitinol which has shape memory

38

What's nitinol made out of ?

Nickel & Titanium