Edited Prsentation Kimia...

FORM 4: CHEMISTRY GLASS AND CERAMIC

GLASS  Glass

is made up by a melting sand.  The sand used is selected quartz that contains pure silica (silica dioxide)  The structure of solid glass are not arranged orderly manner and and it is similar to the state that exists in liquid.  Thus, the glass is classified as liquid that extremely cold.

GLASS  

Consists of slilicates Most glass are tansparent, chemically inert,brittle and impermeable

Fused glass Is the simplest glass  It is mainly silica  It is highly heat-resistant glass.  Example: Laboratory apparatus. 

Fused glass  Made

up by heating silica from sand exceeding 1700 degree celcius.  Its high viscosity makes its difficult to be designed into items with curved.  contains=99% silica dioxide+ 1% boron oxide

Sodium lime glass    

It is made by heating sand by lime stone It can be melt at low temperature It is easy to be shaped and has a good chemical probability It is also has a high thermal coefficient

Borrosilicate glass It was formed by adding boron side and soda-lime glass It has lower thermal expension coefficient. Three times more ressistant to chemical attacks

Lead crystal glass

 Normally

called crystal or lead glass  It is optically transparent and contains much more lead

Dyed coloured glass • Is made by mixing some coloured transitions metal oxides. • For example, one part of nickel oxide is sufficuent to change glass colur from yellow to purple depending on the original composition of glass.

New uses of glasses  Photochromic glass is used as spectacles lens, which also fuction dark glasses.  Fibre glass is used in electrical equipment.  Fibre optics is used in the field of telecomunication and medical field.

CERAMICS

Very hard,brittle,have a very high melting point, chemically inert and do not corrodes

Ceramics

• They are made by from clay. • They are good insulators of electricity and heat

Uses of ceramics Super conductor Ceramic engine Refractory

THE END 

CREATED BY:NOR AMIRA JASMEN CLASS 4A SMKTMR 2009