chemistry - elements, terminologies and more (examville)
DESCRIPTION
Some basic information on a variety of subjects related to chemistry provided for free by ExamvilleTRANSCRIPT
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Introduction To Chemistry
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CHEMISTRY
ELEMENT,
COMPOUND
AND
MIXTURE
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What is an element ?
Element
A chemical substance
Simplest substance
Cannot be decomposed to a simpler substance
Built up from one type of atoms only
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ELEMENT
Metal Non-Metal
(l) (s) (g) (l) (s)
(g) – gas (l) – liquid (s) - solid
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Examples of Metals
( Sodium )
Na
Use :
Sodium Lamp
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Copper CuUse : Electric Conductor
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Calcium CaUse : Calcium ions needed to form bones
and teeth
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Aluminium AlUse: Making of cooking pots and pans
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Gold ; Aurum AuUse : Jewelry
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Iron; Ferum FeUse : Construction of buildings
and bridges
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Lead PbUses : Water pipes
Pipes for wiring
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Magnesium MgUse : Crackers and Fireworks
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Platinum PtUse: Jewelry
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Potassium KUse : Potassium salts
- agricultural fertilizers
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Silver AgUse : Jewelry
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Tin SnUse : Making containers
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Zinc ZnUses : Dry cells;
Roofing for houses
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Mercury HgUse : In Thermometers
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Examples of Non-Metals
Chlorine ClUse : Killing germs in water
supply
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Argon ArUse : Lighting Bulbs
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Bromine BrUse : Photography
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Boron BUse : Making
Medicine in pharmacy
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Helium HeUse : Filling balloons
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Carbon C Diamond & Graphite
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Hydrogen HUse: Fuel
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Iodine I
Use : Antiseptic
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Neon NeUse : Neon Lights
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Nitrogen NUse : Liquid Nitrogen –
Refrigeration Coolant
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Oxygen O
Use : Gas for Breathing
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Phosphorus P
Use : Matches
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Silicon Si
Use : Computer CPU
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Sulphur S
Use : Manufacture of
Sulphuric Acid
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What is a Compound ?
A Chemical Consists of 2 or
more elements chemically combined
Chemical Bond between the particles
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Examples of Compounds
Ammonium ChlorideUse : Dry Batteries
Constituents : H , N , Cl
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Glucose
Use : Carbohydrates
Constituents : H , C , O
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Sodium Chloride
Use : Flavor for Food
Constituents : Na , Cl
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Calcium carbonate
Use : Building material
Constituents : Ca , C, O
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Sulphuric acid
Use : Car Accumulator
Constituents : H , S , O
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Urea
Use : Nitrogeneous Fetilizer
Constituents : C , H , O , N
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Copper (II) sulphate
Use: FungicideConstituents : Cu , S , O , H
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Potassium nitrate
Use : Agricultural Fertilizers
Constituents : K , N , O
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Ethanoic acid
Use : Vinegar
Constituents : C , H , O
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Trichloromethane (Chloroform)
Use : Anaesthetic
Cost : C , H , Cl
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What is a Mixture ? Substance consisting of 2
or more substances physically combined together
Components : Elements or/and compounds
Components can be separated by physical means
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Examples of Mixtures
Air– Oxygen, Nitrogen, Carbon dioxide, water
vapor etc
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Soil
Constituents : Humus, sand,
air, water, minerals etc.
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Milk
Components : Lactose, water, proteins, vitamins, minerals etc