Presentation on theme: "Most of the elements in the periodic table are metals. The crust of the earth is the biggest source of metals. Some soluble salts of metals are found."— Presentation transcript:
Most of the elements in the periodic table are metals. The crust of the earth is the biggest source of metals. Some soluble salts of metals are found in sea water.
REACTION OF OXYGEN IN AIR WITH METALS: Metals react with oxygen of air to produce their respective oxides. http://www.youtube.com/watch?feature=play er_detailpage&v=TvHo8Q64AXs
Magnesium burns brilliantly in air forming oxide. 2Mg + O2 → 2MgO A FOIL OF Cu IS HEATED IN A FLAME,A BLACK LAYER FORMED ON THE FOIL AFTER COOLING IS THE RESULT OF FORMATION OF ITS OXIDE. 2Cu + O2 → 2CuO
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> one of the metals known for a long time. > Extraction of copper from its ores was known even in 5000 B.C. > it is a transition element with, > atomic number: 29 > mass number: 64 > Symbol: Cu > electronic Configuration: 1s22s22p63s23p63d104s1
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> Rose red heavy metal. > malleable and ductile. > a very good conductor of electricity and heat. > It is next only to silver in thermal conductivity. > It has high melting point and high boiling point.
AN Alloy is a homogeneous mixture of (a) two or more metals, or (b) metals and non-metals. An alloy is called a solid solution. The homogeneous mixture is produced in molten state and then solidified.
ALLOYSCOMPONENTSUSES BRASSCOPPER AND ZINCUTENSILS,ELECTRICAL APPLIANCES,MACHINERY BRONZECOPPER AND TINSTATUES,BELLS,MEDALS COINS GERMAN SILVERCOPPER, ZINC & NICKELUTENSILS,RESISTANCE COILS,ORNAMENTAL WARES. GUN METALCOPPER,TIN & ZINCBARREL OF GUNS,GEARS AND CASTING ALLOYS OF COPPER
* most useful metal industrially hence it may be called “the king of metals.” * a transition element with, * atomic number: 26 * mass number:56 * symbol : Fe * electronic configuration: 1s2, 2s22p6, 3s23p63d6, 4s2.
core of the earth contains solid iron under very high pressure, this is surrounded by a layer of molten metals. The ores of iron are: haematite (Fe2O3), magnetite (Fe3O4), limonite (Fe2O3 H2O) siderite (FeCO3).
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> Iron is a greyish white solid metal. > Pure iron is soft. >Iron is a ferromagnetic substance. >Its melting point is 1808K.