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CHEMISTRY PROJECT

REPORTSURFACE CHEMISTRY

MADE BY

BHUMIKA CHAWLAXII PCM

CERTIFICATE

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This is to certify that BHUMIKA CHAWLA of cass !" PCM of #ehr$

Wor% Schoo &ha'ia(a% has co)*ete% her *ro+ect $,%er )y

s$*er-isio,. She has ta/e, *ro*er care of 0oo%s a,% has sho1,

si,cerity i, co)*etio, of this *ro+ect o, s$rface che)istry. I

certify that this *ro+ect is $* to )y e2*ectatio,s a,% as *er0$i%a,ce iss$e% (y C.B.S.E.

Teacher3s Si0,at$re4

55555555555555555

ACK#6WLED&EME#TI 1o$% i/e to e2*ress )y s*ecia tha,/s of 0ratit$%e to )yteacher 7the #a)e of teacher8 as 1e as o$r *ri,ci*a 7#a)e of

the *ri,ci*a81ho 0a-e )e the 0o%e, o**ort$,ity to %o this

1o,%erf$ *ro+ect o, the to*ic 7Write the to*ic ,a)e89 1hich aso

he*e% )e i, %oi,0 a ot of Research a,% i ca)e to /,o1 a(o$t so

)a,y ,e1 thi,0s I a) reay tha,/f$ to the).

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Seco,%y i 1o$% aso i/e to tha,/ )y *are,ts a,% frie,%s 1ho

he*e% )e a ot i, :,ai'i,0 this *ro+ect 1ithi, the i)ite% ti)e

fra)e.

I#DEX

!. I#TR6DUCTI6#

". TYPES 6F C6LL6IDS

;. CLASSIFICATI6# 6F C6LL6IDS

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Introduction :

A colloid or colloidaldispersion is a typeof homogenous mixture. A colloid consistsof two separate phases:Dispersed phase &Continuous phase. The Dispersed phaseismade of tiny particlesor droplets that aredistributed evenly throughout thecontinuous phase. omogeneous mixtureswith a Dispersed phase in the si!e range "

#m

to"$$ nm

may be called colloidalaerosols% colloidalemulsions% colloidalfoams% colloidal dispersions orhydrosols.If acolloidal has a solid phase dispersed in a

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liuid% thesolid particles will not passthrough a membrane% whereasthe dissolvedions or molecules of a solution will

passthrough.'ome colloids are translucentdue to Tyndall effect(scattering of light byparticles in colloid).'ome of the examplesof colloids include butter% mil*%aerosols(fog% smo*e)% paints% glues etc.This field ofstudy was introduced in "+," by

'cottishscientist -Thomas Graham

TYPES 6F C6LL6IDS