metals and alloys

Question 1

what is copper?

Answer 1

a metallic element

Question 2

what are ores

Answer 2

compounds

Question 3

how do you extract copper?

Answer 3

convert the ore to copper oxide

Question 4

how do you remove oxygen form coper oxide?

Answer 4

heated with carbon

Question 5

what is removal of oxygen called?

Answer 5

reduction

Question 6

how do we purify copper?

Answer 6

through electryolosis

Question 7

why is recycling cheaper than extracting copper from its ore?

Answer 7

it saves resources- dont need so many copper mines

it saves energy needed to crush rocks and to operate smelters and electrolysis cells

Question 8

what is the anode?

Answer 8

impure copper

Question 9

what does the anode do?

Answer 9

dissolves into the electrolyte and pure copper coats the cathode. The cathode is plated with new copper

Question 10

explain copper?

Answer 10

low melting point. it is easy to melt and recycle, which makes it cheap

Question 11

what is bad about recycling copper?

Answer 11

getting people to do it in the first place

sorting copper form other metals

Question 12

what can contaminated copper be used to make?

Answer 12

alloys such as brass or bronze or electrolysed

Question 13

what is electrolysis?

Answer 13

the break up of a chemical compound when you use an electric current

Question 14

how do we purify copper?

Answer 14

use an electrolyte of copper ii sulphate solution

Question 15

what is the pure and impure copper?

Answer 15

impure is anode

pure is cathode

Question 16

why does the cathode gain mass?

Answer 16

because copper is plated on it

Question 17

what is a gain in electrons called?

Answer 17

reduction

Question 18

what deposits onto the cathode?

Answer 18

ions from the copper sulphate electrolyte gain electron and deposit

Question 19

what happens at the anode?

Answer 19

it dissolves. Copper atoms in the anode turn into ions putting copper ions back into the electrolyte

Question 20

what is loss of electrons called?

Answer 20

reduction

Question 21

where do the impurities go?

Answer 21

to the bottom of the cell

Question 22

what are the 2 equations for the anode and cathode?

Answer 22

anode- cu - 2e- —– cu2+

cathode- cu2+ + 2e- — cu

Question 23

what is an alloy?

Answer 23

a mixture of a metal element with another element

Question 24

what are the 4 alloys and give an example of what their made from?

Answer 24

brass contains copper and zinc
solder lead and tin
steel iron
amalgam mercury

Question 25

explain steel?

Answer 25

much stronger than iron and does not rust (stainless steel)

Question 26

what is an alloy called that can bend?

Answer 26

a smart alloy

Question 27

what are shape memory alloys called?

Answer 27

alloys that can change shape at set temperatures

Question 28

how do smart alloys help people with the risk of heart attacks?

Answer 28

they can be put into a persons artery, warmed up to change into a tube that holds the artery open