C2c-metals And Alloys

Question 1

What is reduction?

Answer 1

The removal of oxygen from a substance

Question 2

Why is recycling copper cheaper than extracting it from its ore?

Answer 2

Saves resources

Uses less energy

Question 3

What are the disadvantages of recycling copper?

Answer 3

You have to sort out copper from all other waste metals

Takes time and energy

Question 4

What is electrolysis?

Answer 4

Splitting up with electricity

Question 5

What happens in the electrolysis of copper?

Answer 5

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

Question 6

What happens at the cathode?

Answer 6

Reduction because electrons are gained

Question 7

What happens at the anode?

Answer 7

Oxidation because electrons are lost

Question 8

What is the half equation for the reaction at the cathode?

Answer 8

Cu2+ + 2e- –> Cu

Question 9

What is the half equation for the reaction at the anode?

Answer 9

Cu –> Cu2+ + 2e-

Question 10

What are alloys?

Answer 10

Mixtures containing one or more metal elements

Question 11

What metal is amalgam made out of and uses?

Answer 11

Mercury

Tooth fillings

Question 12

What metals is brass made out of and uses?

Answer 12

Copper and zinc
Musical instruments
Coins
door knockers

Question 13

What metals make solder and uses?

Answer 13

Lead and tin

Used to join electrical wires

Question 14

How does nitinol have shape memory?

Answer 14

Used to make spectacle frames

Return to original shape after bending

Question 15

How can copper be extracted?

Answer 15

By heating its ore with carbon