Quick chemistry revision
•Manufactured substance in industry
State the process and manufactured substance
Sulphuric acidContact Process
Ammonia Haber Process
Write equations for each stage to in Contact process
Stage 1 S + O2 SO2
Stage 2 2SO2 + O2 2SO3
Stage 3 SO3 + H2SO4 H2S2O7
H2S2O7+ H2O 2 H2SO4
State conditions needed in stage 2 contact process
Temperature 450 oC
pressure1 atm
catalyst Vanadium (V) oxide
State 3 uses of sulphuric acid
Manufacture of detergent
Production of fertiliser
Electrolytes in car battery
How can sulphur dioxide cause environmental problems?
cause coughing , chest pain
Cause acid rain that corrodes building and metal structures
Write equation for manufacture of ammonia in Haber process
N2 + 3H2 2NH3
State 3 conditions in the Haber process
Temperature 450 o C
pressure 200 atmosphere
Catalyst iron
State 3 uses of ammonia
Manufacture of fertiliser
To make nitric acid
State some properties of ammonia
Colourless gas
Has a pungent smell
Very soluble in water
State composition of alloys
bronze Copper and tin
brass Copper and zinc
Steel Iron and carbon
Why is alloy harder than its pure metals?
Atoms in alloyNot of same sizes
Not in orderly arrangementLess empty spaces between atoms
So, when force is applied, atoms are difficult to slip and slide
State monomers from polymers below
polythene Ethene
polypropene Propene
How does synthetic polymers pose environmental problems?
Not biodegradable, therefore difficult to dispose
When burnt, give out harmful gases
STATE TYPE OF GLASS WITH THESE PROPERTIES
Cheap, breaks easily, cannot withstand heat
Soda lime glass
Heat resistant and chemical resistant
Borosilicate glass
Heat resistant, optical transparency
Fused glass
Soft and easy to melt Lead crystal glass
STATE USES OF GLASS WITH THESE PROPERTIES
Cheap, breaks easily, cannot withstand heat
Cheap Glass containers, window panes
Heat resistant and chemical resistant
Cookware
Heat resistant, optical transparency
Laboratory glass, lenses,telescope mirrors
Soft and easy to melt Lead crystal glassware
STATE USES OF GLASS WITH TYPES OF GLASS
Cheap Glass containers, window panes
Cookware
Laboratory glass, lenses,telescope mirrors
Lead crystal glassware
Soda lime glass
Borosilicate glass
Fused glass
Lead crystal glass
State uses of composite materials
Super conductors Bullet train, MRI in hospitals
Fibre optic Mobile phones, in instrument to examine internal parts of body
Fibre glass Water tanks, rackets, helmets, boats
Photo chromic glass Optical lenses, car windshield