5.3 metal mixtures Flashcards
what are alloys?
mixture of different metals together, but not bonded
bronze is made by mixing _____ and _____.
copper, tin
steel is made by mixing _____ and ______ and sometimes ______ and __________.
iron, carbon, chromium, nickel
why do alloys have different properties from the pure metals?
arrangement of particles (a different sized atom disrupts the regular pattern
what are coins made of?
copper and nickel
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
gold, copper, 24
what is duralumin?
by adding magnesium and copper to aluminium, duralumin is made. its 5 times stronger than pure aluminium
why would pure aluminium not work to build planes?
pure aluminium is too weak and the wings would fall off because of the great stress put on them during flight
why do we not use pure silver/copper for coins?
they are too soft and too expensive. coins must be hard wearing but malleable enough to be shaped into complex patterns
name 3 alloys
steel, brass, bronze, duralumin
give 1 property that brass and bronze share
less ductile than copper
give 1 difference in properties between copper and tin
tin is soft, copper is harder
brass is an alloy of _____ and _____
copper, zinc
nitinol is made from _____ and ______.
nickel and titanium
