MATERIALS Types of materials Metals and non metals

MATERIALS • Types of materials: Metals and non metals. • Physical properties of metals: • Metals are lustrous, sonorous, malleable, ductile, good conductors of heat and electricty.

LUSTROUS • Bright appearance. • Ductility: Metals can be drawn in to wires. • Sonorous: Producing sound.

MALLEABILITY • Metals are lustrous, sonorous, malleable, • ductile, good conductors of heat and • Ductility: Metals can be drawn in to wires. • Sonorous: Producing sound.

GOOD CONDUCTORS • Good conductors: Conduct heat and electricity. • Hard • Examples; Iron, copper, aluminum, magnesium etc

PHYSICAL PROPERTIES Non metals Non-sonorous Brittle Poor conductors of heat and electricity. • Non malleable. • •

NON METALS • They breakdown easily. • They are not sonorous. • They are poor conductors of heat and electricity.

EXAMPLES • Non- metals • sulphur, carbon, oxygen, phosphorous etc. • Exceptions: • Metals like sodium, potassium can • Cut with knife. • Mercury only metal in liquid state.

CHEMICAL PROPERTIES • • Rusting : Iron reacts with oxygen to form rust. Reaction of metals with oxygen. Metals react with oxygen to form its oxide.

REACTION OF NON– METALS WITH OXYGEN • Sulphur +oxygen sulphur di-oxide • When sulphur di-oxide is added with water, sulphurous acid is formed. • It turns blue litmus to red which shows that it is acidic in nature.

METAL OXIDE – BASIC IN NATURE • When magnesium oxide is added with water and tested with red litmus then red turns to blue, Which shows that it is basic in nature. • Mg. O + H 2 O Mg(OH)2

REACTION WITH OXYGEN Eg: • Iron +oxygen+ water iron oxide(rust) • Magnesium +oxygen magnesium oxide

SUMMARY • Metals are lustrous, malleable, ductile and good conductors • Non-metals are brittle, poor conductors, non lustrous etc • Metals react with oxygen to form its oxides • Metal oxide is basic in nature. • Non metal oxides are acidic in nature.

Thank you End of module II/III