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Natural & Processed Materials.

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

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Natural & Processed Materials.

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  1. Natural & Processed Materials. Term 3, 2008

  2. 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.

  3. STRENGTH

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

  5. SizeHow could you measure the size safely.

  6. HARDNESS0 very soft 10 very hardUse a stick and rub for 1 minute.

  7. Properties

  8. CHANGE OF STATESolid, liquid and gas Interesting mixtures. Clay in water Fizzy drinks Cornflour and water Volcanic rock

  9. 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.

  10. CHEMICAL CHANGE • Cooked eggs • Burnt wood • Burn Mg ribbon • Cycad nuts

  11. Chemical Reactions & Mixtures (solutions, suspensions & sediments)

  12. 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

  13. Separating mixtures • Filter • Magnet • Evaporation • Sedimentation and decanting

  14. Assessment-seperating mixtures. • Provided with a mixture of: • Coarse sand • Iron filings • Salt crystals

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