Natural & Processed Materials.

Term 3, 2008

Observable properties

• Secret bags and boxes.– Identify items by touch.

• Natural and Man-made• Tennis ball, eggs, sweet and other potatoes, rocks.• Look at property of each and group accordingly-

– Shape– Size- microscopic– Texture- cotton wool & concrete– Density- heavy stone, light polystyrene ball– Temperature- feathers, wool, stones & concrete (in fire, sun, cold

water), ice – Use- glass, wood, metal & plastic– Look at composite items, like a car and list all the materials and their

uses– Personal preference. Why?– Test strength, hardness, stretchability.

STRENGTH

Spider silk

Fishing line

Rope

Pandanus

ElasticityTake a 10 cm piece, and stretch it and measure again.

Elastic

Rubberised cord

Wool

Fishing line

SizeHow could you measure the size safely.

The Northern Territory

Truck

Spider’s leg

Scabies mite

HARDNESS0 very soft 10 very hard

Use a stick and rub for 1 minute.

Polystyrene block

Sedimentary rock

Igneous rock

Cement

PropertiesTemperature Mass Texture Use

Cold Hot Light Heavy Rough Smooth

Stone

Concrete

Ice

Feather

Wood

CHANGE OF STATE Solid, liquid and gas

Solid Liquid Gas

Particles

Shape

Property Rigid Pour

Interesting mixtures.

Clay in water

Fizzy drinks

Cornflour and water

Volcanic rock

PHYSICAL STATE

• 2 kids cling together.• Wet a kid.• Melt ice.• Boil water.• Change shape and colour of

– Playdough– Wire– Sponge– Elastic

• Heat up Milo to drink.• Put bubbles in water to play.

CHEMICAL CHANGE

• Cooked eggs

• Burnt wood

• Burn Mg ribbon

• Cycad nuts

Chemical Reactions & Mixtures (solutions, suspensions & sediments)

Water and sand

Water and cordial

Water and salt

Water and chalk dust

Water and pancake mix

Water and clay

Sand and iron filings

Drama• Separating people into groups

– Moiety• Dhuwa & Yirritja

– Gender• Using drama to show separation using colours.

– Filter– Magnet– Sedimentation– Evaporation

• Every day examples of these:– Filter: sports bag, kitchen colanders and sieves, teabags, and coffee

filters Lawn mower and car filters– Magnet: generator, electro-magnet– Sedimentation: sand settles to the bottom of puddles, use for car– Evaporation: dry clothes

Separating mixtures

• Filter

• Magnet

• Evaporation

• Sedimentation and decanting

Assessment-seperating mixtures.

• Provided with a mixture of:– Coarse sand– Iron filings– Salt crystals