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Are you ready to learn?

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4.6 PROPERTIES OF METALS AND NON-

METALS

03LEARNING OUTCOMES

• List examples of metals and non metals• List the properties of metals and non-metals• List the uses of metals and non-metals in daily

life• Compare and contrast metals and non-metals

based on their physical properties• Relate the physical properties of metals and

non-metals to their uses in daily life

04METALS AND NON-METALS• Elements can be classified into metals and

non-metals,• All metals exist in solid state at room

temperature except mercury (liquid)• Non-metals exist in solid liquid or gaseous

state at room temperature• Examples of metals: Iron, aluminum , copper ,

lead• Examples of non metals : Carbon , Iodine ,

Bromine , Sulphur

05PHYSICAL PROPERTIES OF METALS AND NON-METALS

• Metals and non-metals can be differentiated by the following physical properties:

a)Luminosity : Shinny appearanceb)Ductility : Ductile can be stretched out like

long wirec) Malleability : Can be hammered or rolled into

thin sheetd)Tensile strength : Support pressure or load

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06ACTIVITY 1 : HANDOUTMETALS DIFFERENCE NON-METALS

Shiny surface Luminosity Dull surface

Ductile Ductility Not ductile

Rolled or hammered into thin sheet

Malleability Cannot be forged

High Tensile strength Low

Good conductor Heat conductivity Poor conductor

High Melting point and boiling point

Low

High Density Low

Good conductor Electrical conductivity

Do not conduct electricity except

carbon

07USES OF METALS AND NON-METALS IN DAILY LIFE

METAL PHYSICAL PROPERTY USE

Iron High tensile strength Railways track

Aluminum -Light-Good conductor of electricity and heat

Kitchen utensils

Copper Ductile and malleable Electrical wire

Tin Does not rust Electroplating of food cans

Gold Does not rust and shiny

Jewellery

Lead DuctileMalleable

Cable casing

08NON-METAL PHYSICAL PROPERTY USE

Carbon (graphite) -Soft and smooth-Good conductor

-Lead of pencils-Electrodes in electrolysis and dry cells

Carbon (diamond) -Hard Drill bits for cutting stone

Neon gas and krypton

-Poor conductor Lights used for billboards

Chlorine -Acidic Kill germs in drinking water

09EXERCISE / HOMEWORK

• 1) Give 2 examples each of metals and non-metals• 2) Relate physical properties of metals to their uses

Use of metal Physical property of metalDrawn out to become a long

wireMaterial of I cent coin

Making of cooking utensilsMaking of electric wire

Making of bridgesMaking of jewellery