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Transcript

  • 1. Changes to Materials
  • 2. What is a Solid?
    (3)
    (1)
    A tennis ball
    A diamond
    A piece of wood
    (2)
    A solid has definite shape and volume.
  • 3. What is a Liquid?
    (4)
    A liquid has no definite shape, but does have definite volume.
  • 4. What is a Gas?
    (5)
    (6)
    Sulphur dioxide
    Carbon dioxide
    A gas has no definite shape or volume.
  • 5. Changes to materials can be reversible;
    such as melting, freezing or evaporating.
    An ice cube melting
    (7)
  • 6. Changes to materials can be irreversible;
    such as burning, rusting or cooking.
    Gases of carbon dioxide
    Ash left over from burnt paper
    (8)
  • 7. What is Physical Change?
    (9)
    Water may freeze, melt or evaporate, but it is always water – it has only physically changed.
  • 8. Different Physical Changes
    (10)
    (11)
    (12)
    (13)
    They have changed shape, but have not changed chemical substances.
  • 9. What is Chemical Change?
    (15)
    (14)
    A kernel of corn, if heated changes into popcorn. It cannot be changed back – it has chemically changed.
  • 10. Different Chemical Changes
    (17)
    (16)
    (19)
    (18)
    They have changed chemically and cannot be changed back.
  • 11. Misconceptions
    Water disappears?
    Solids dissolve?
    (18)
    • Solids melt, not dissolve.
    • 12. Water evaporates, not disappears.
  • Reversible changes to Recycled Materials
    (19)
    (22)
    (20)
    (21)
    Recyclable materials can be remade into another product without making a chemical change.
  • 13.
    • Physical changes to materials are reversible.
    • 14. Chemical changes to materials are irreversible.
  • References:
    Image References:
    Number 1 – Microsoft 2007 Clipart, retrieved from document clipart “wood”, March 5, 2011
    Number 2 – Microsoft 2007 Clipart, retrieved from document clipart “diamond”, March 5, 2011
    Number 3 – Microsoft 2007 Clipart, retrieved from document clipart “tennis ball”, March 5, 2011
    Number 4 – “water pouring” retrieved March 5, 2011 from http://www.witweightloss.com/fat-burning-foods/top-five-benefits-water-you-should-take-advantage.html
    Number 5 – “volcano” retrieved March 5, 2011 from http://volcanoes.usgs.gov/images/pglossary/VolcGas.php
    Number 6 – “smoke stack” retrieved March 5, 2011 from http://www.treehuggerusa.com/greenhouse-gases/index.html
    Number 7 – Microsoft 2007 Clipart, retrieved from document clipart “ice melting”, March 5, 2011
    Number 8 – “burning paper” retrieved March 5, 2011 from http://www.dreamstime.com/stock-images-burning-paper-image17090564
    Number 9 – “water cycle” retrieved March 5, 2011 from http://www.urbanrivers.org/water_cycle.html
    Number 10 – “piece of wood” retrieved March 5, 2011 from http://www.istockphoto.com/stock-photo-4249015-single-piece-of-wood.php
    Number 11 – “baseball bat” retrieved March 5, 2011 from http://dee-wnax.itmblog.com/2009/08/
    Number 12 – “piece of paper” retrieved March 5, 2011 from http://www.curling.org.au/blog/Lists/Posts/Post.aspx?List=677e8176%2D8663%2D4361%2Da012%2D566d1db4b5a7&ID=31
    Number 13 – Microsoft 2007 Clipart, retrieved from document clipart “paper plane”, March 5, 2011
    Number 14 – Microsoft 2007 Clipart, retrieved from document clipart “corn”, March 5, 2011
    Number 15 – Microsoft 2007 Clipart, retrieved from document clipart “popcorn”, March 5, 2011
    Number 16 – “big car” retrieved March 5, 2011 from http://www.city-data.com/forum/automotive/139197-news-do-you-own-small-car.html
    Number 17 – “rusty car” retrieved March 5, 2011 from http://www.bumpworthy.com/bumps/668
    Number 18 – Microsoft 2007 Clipart, retrieved from document clipart “firework”, March 5, 2011
    Number 19 – Microsoft 2007 Clipart, retrieved from document clipart “firework”, March 5, 2011
    Number 18 – Microsoft 2007 Clipart, retrieved from document clipart “confused”, March 5 2011
    Number 19 – Microsoft 2007 Clipart, retrieved from document clipart “glass bottle“, March 5, 2011
    Number 20 – Microsoft 2007 Clipart, retrieved from document clipart “recycled“, March 5, 2011
    Number 21 – Microsoft 2007 Clipart, retrieved from document clipart “aluminium can“, March 5, 2011
    Number 22 – Microsoft 2007 Clipart, retrieved from document clipart “plastic bottle“, March 5, 2011