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8.1) ALLOY AND IT’S IMPORTANT

PEWTER USED TO MAKE SOUVENIRS COMPARISON OR PROPERTIES OF ALLOYS AND PURE
METALS

DURALIMIN USE TO MAKE AEROPLANE BODY

ALLOY METAL

BRONZE USE TO MAKE MEDALS

BRASS USE TO MAKE KEYS SHINY SURFACE DULL

STEEL USE TO MAKE CAR BODY RESISTANT TO RESISTANCE EASILY
USE TO MAKE CUTLERY CORROSION CORRODED
STAINLESS TO
STEEL CORROSION LESS
HARD
HARD HARDNESS

PURE METALS ARE DUCTILES ❖ MADE UP OF ONE TYPE OF ATOM OF JUSTIFY THE USES OF ALLOYS
ON THEIR COMPOSITION AND
THE SAME SIZE
❖ ARRANGED IN ORDERLY PROPERTIES

ARRANGEMENT
❖ LAYERS OF ATOMS IN THE METAL

SLIDE OVER EACH OTHER EASILY

WHEN FORCE IS APPLIED
❖ CAUSES PURE METALS TU BE DUCTILE

AND PULLED INTO FINE WIRES EASILY

PURE METALS ARE MALLEABLE

❖ IT’S SHAPE CAN BE CHANGE EASILY
❖ THERA ARE EMPTY SPACE BETWEEN

IN A PURE METAL
❖ THE LAYERS OF ATOM WILL SLIDE TO

FILL EMPTY SPACES AN FORM A NEW

STRUCTURE WHEN FORCE IS APPLIED

ATOMS ARRANGEMENT IN :

❖ FORMED WHEN FOREIGN ATOMS ARE

MIXED WITH THE PURE METAL
❖ FOREIGN ATOMS HAVE DIFFERENT SIZES

COMPARED TO PURE METAL
❖ THE ORDERLY ARRANGEMENT OF

ATOMSI N A PURE METAL IS DISRUPTED
❖ LAYERS OF ATOM IN ALLOY ARE

DIFFICULT TO SLIDE OVER EACH OTHER

WHEN FORCE IS APPLIED