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Quick chemistry revision
Manufactured substance in industry
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State the process and manufactured substance
Contact Process Sulphuric acid Ammonia Haber Process
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Write equations for each stage to in Contact process
S + O2 SO2 Stage 2 2SO2 + O2 2SO3 Stage 3 SO3 + H2SO4 H2S2O7 H2S2O7+ H2O 2 H2SO4
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State conditions needed in stage 2 contact process
Temperature 450 oC pressure 1 atm catalyst Vanadium (V) oxide
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State 3 uses of sulphuric acid
Manufacture of detergent Production of fertiliser Electrolytes in car battery
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How can sulphur dioxide cause environmental problems?
cause coughing , chest pain Cause acid rain that corrodes building and metal structures
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Write equation for manufacture of ammonia in Haber process
N2 + 3H2 2NH3
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State 3 conditions in the Haber process
Temperature 450 o C pressure 200 atmosphere Catalyst iron
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Manufacture of fertiliser
State 3 uses of ammonia Manufacture of fertiliser To make nitric acid
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State some properties of ammonia
Colourless gas Has a pungent smell Very soluble in water
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State composition of alloys
bronze Copper and tin brass Copper and zinc Steel Iron and carbon
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Why is alloy harder than its pure metals?
Atoms in alloy Not of same sizes Not in orderly arrangement Less empty spaces between atoms So, when force is applied, atoms are difficult to slip and slide
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State monomers from polymers below
polythene Ethene polypropene Propene
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How does synthetic polymers pose environmental problems?
Not biodegradable, therefore difficult to dispose When burnt, give out harmful gases
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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
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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
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State uses of glass with types of glass
Cheap Glass containers, window panes Soda lime glass Laboratory glass, lenses,telescope mirrors Fused glass Lead crystal glass Lead crystal glassware Cookware Borosilicate glass
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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
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