116. Dry ice
• Solid CO2 called.
• It is directly, solid gas
Uses-
• Food industry cooling food.
• Making cool bath lab.
• Fire extinguisher.
117.
118.
119.
120.
121.
122.
123. Silicon (E.F- R2SiO)
• Si are synthetic compound
containing R2SiO unit.
• R= CH3 or C6H5 group.
• short chain-oily liquid.
medium- viscous and jelly
long- rubbery elastomer.
• Water resistance.
• High thermal stability and
dielectric strength.
124. Application(use)
• Use to prepare water proof
paper, wood and textiles.
• Used as lubricant high and low
Temperature.
• Use as sealant(sealing or
seal), grease & electrical
insulator.
• Surgical and cosmetic.
126. Zeolites or (aluminosilicate)
• Greek Zein-boiling,lithos-
stone.
• Silicate in which few Si atom
are replaced by Al atoms….
• They carry –ve charge.
• -ve charge balanced by cation
such as Na+,K+,Ca2+.
127. Water should not kept in aluminum
utensil. Reason?
• It give small amount of
Al3+ ion.
• Al3+ is harmful to health.
Al + H2O +O2 Al2O32 + H2
128. Aluminium wire is used to make
transmission cables.Reason?
• Al is light metal.
• Al alloy- strong and high
tensile
strength(tough).anticorrosion.
• Good conductor.
• Cheaper then Cu,Ag,Au.
129. Aluminium alloy are used to make
aircraft body.Reason?
• Al is light metal.
• Al alloy- strong and high
tensile
strength(tough).anticorrosion.
• Eg. Duralumin-
Al(95%),Cu(3%),Mn(1%),Mg(1%)
130. Concentrated HNO3 can be
transported in Al container.
• Al + HNO3 acid thin film
of Al oxide on its surface.
• This protect Al from
further action.
131. Excessive content of CO2
responsible for global warming.
• Excessive CO2 lead green
house effect.
• Green house disturbed ozone
gas.
• increase the Temperature
causes climate change.
132. Excessive content of CO2
responsible for global warming.
• Excessive CO2 lead green
house effect.
• Green house disturbed ozone
gas.
• increase the Temperature
causes climate change.
Notes de l'éditeur
Diborane me B-B apas me hydrogen se juda hai na ke B-B banake.