5.3 metal mixtures

Question 1

what are alloys?

Answer 1

mixture of different metals together, but not bonded

Question 2

bronze is made by mixing _____ and _____.

Answer 2

copper, tin

Question 3

steel is made by mixing _____ and ______ and sometimes ______ and __________.

Answer 3

iron, carbon, chromium, nickel

Question 4

why do alloys have different properties from the pure metals?

Answer 4

arrangement of particles (a different sized atom disrupts the regular pattern

Question 5

what are coins made of?

Answer 5

copper and nickel

Question 6

gold is made from ____ and _____. pure gold cannot be used for jewellery because it is soft and would tear and wear off. pure gold is _____ carat

Answer 6

gold, copper, 24

Question 7

what is duralumin?

Answer 7

by adding magnesium and copper to aluminium, duralumin is made. its 5 times stronger than pure aluminium

Question 7

why would pure aluminium not work to build planes?

Answer 7

pure aluminium is too weak and the wings would fall off because of the great stress put on them during flight

Question 8

why do we not use pure silver/copper for coins?

Answer 8

they are too soft and too expensive. coins must be hard wearing but malleable enough to be shaped into complex patterns

Question 9

name 3 alloys

Answer 9

steel, brass, bronze, duralumin

Question 10

give 1 property that brass and bronze share

Answer 10

less ductile than copper

Question 11

give 1 difference in properties between copper and tin

Answer 11

tin is soft, copper is harder

Question 12

brass is an alloy of _____ and _____

Answer 12

copper, zinc

Question 13

nitinol is made from _____ and ______.

Answer 13

nickel and titanium