Alloys as useful materials

Question 1

Alloy definition

Answer 1

mixture of a metal with another element

Question 2

Why are pure metals malleable

Answer 2

ions are the same size, ions are arranged in regular layers, layers slide over each other so the can be bent/shaped easily

Question 3

Why are alloys less malleable

Answer 3

mix of different sized ions form distorted layers that do not slide over each other

Question 4

Are alloys or pure metals more malleable

Answer 4

pure = more malleable

Question 5

Properties and uses of low carbon steel

Answer 5

more easily shaped, car bodies, knives, containers

Question 6

Properties and uses of high carbon steel

Answer 6

strong, very brittle, structural steel

Question 7

Properties and uses of stainless steel

Answer 7

hard, strong, resistant to corrosion, cutlery

Question 8

Mixture and uses of bronze

Answer 8

copper + tin. statues, medals

Question 9

Mixture and uses of brass

Answer 9

copper + zinc, water taps, door fittings

Question 10

Mixture and uses of bronzaluminium alloys

Answer 10

aluminium + magnesium, aircraft, bike frames

Question 11

Mixture and uses of gold alloys

Answer 11

gold + copper (red gold), gold + silver (yellow gold), jewellery (shiny)

Question 12

What carat is 100% gold

Answer 12

24

Question 13

How to work out the percentage of gold in 18 carat

Answer 13

18/24 x 100 = 75% gold