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ALLOY

1. What means alloy?

2. What is the purpose in making alloy?

i)

ii)

iii)

3. Examples of alloy and their component.

Alloy Composition Uses

rass !aking musical instruments" kitchen#are

ron$e %&' copper" 1&' tin

(teel

(tainless

steel

!aking cutlery"surgical instruments

uralumin

*e#ter

+. Experiment

a),im- o compare the hardness of a pure metal and its alloy

/0seration- iameter of dent on the copper 0lock is 0igger than the diameter of dent on

the 0ron$e 0lock.

nference-

1.he opper is 4444444444 than 0ron$e.

2.ron$e is alloy made from copper and tin. he presence of tin atoms distur0 the 44444444

44444444444 of copper atoms. (o the layers of copper no# no longer 444444444 444444444 oe

one another.

onclusion-

ron$e 5alloy) is harder than copper 5 pure metal).

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0),im- o compare the rusting resistance of a pure metal and its alloy

ype of nail /0seration nference

iron nail , lot of 0lue spots is formed around the

iron nail

rusting occur

steel nail , little 0lue spots is formed around the

steel nail

a little rusting occur

stainless steel

nail

6o 0lue spots is formed around the

stainless steel nail

no rusting

1.he stainless steel has the 44444444 rusting resistance and it does not rusted.

onclusion-

(tainless steel has highest rusting resistance" follo#ed 0y steel" the iron5pure metal) has tlo#est rusting resistance.

7. (tructure of pure metal and alloy

opper 0ron$e

Synthetic polymer

1. What means polymer?

2. *olymers can 0e diided into t#o-

naturally polymers and synthetic polymers

3. Examples of naturally polymers-

+. Examples of synthetic polymers-

7. !onomer for polymers

i) polythene 8

ii)polypropene 9

iii)polyinyl chloride9

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Glass and Ceramics

1. omponent of glass

:lass eramic

omponent silica or silicon dioxide " (i/2. kaolinite5hydrated aluminosilicate"

,l2/3.2(i/2.2;2/)*roperties5similarities)

5a) hard 0ut 0rittle50) hemically inert and does notcorrode5c) :ood insulator of electricityand heat5d)

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image indigitalformatCse toreplacecopper#ire in

longdistancetelephonelines"mo0ilephones"ideo cameraetc

n racket"small0oat" skinandhelmets

energy

i=erences

9cheapEasily moulded

and shaped

9lo# po#erdissipation

9high speedoperation;igh sensitiity

9lo#material

cost9hightransmissioncapacity9chemicalsta0ility9lesssuscepti0le

;ightensile

strengthan 0emadeinto thinlayersEasilymouldedandshaped