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Unit 3 Second grade Science

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  • What is this?
    Stretch
  • What is this?
    Twist
  • What in insoluble?
    It does not dissolve in water
  • What material is this?
    Plastic
  • What are irreversible changes?
    We cannot obtain the original material again.
  • Reversible or irreversible?
    Irreversible
  • What are physical changes?
    Only the shape changes. Reversible changes.
  • What material is this?
    Plastic
  • What is this?
    Bend
  • What material is this?
    Rubber
  • What are the 3 Rs to take care of the planet?
    Reduce, reuse and recycle
  • What material is this?
    Plastic
  • What material is this?
    fabric
  • What material is this?
    Glass
  • What are man- made materials?
    Materials that are made by man (from natural).
  • What material is this?
    stones
  • Reversible or irreversible?
    Reversible
  • What are reversible changes?
    When we come back to the material we had at the begining.
  • What material is this?
    Rubber
  • What material is this?
  • What are chemical changes
    A new sustance is obtain. Irreversible changes.
  • What material is this?
    Metal and diamond
  • What is dissolving?
    When we mix a sustance with water and it dissapears.
  • What are natural materials?
    Materials that comes from nature.
  • Reversible or irreversible?
    Reversible
  • What is soluble?
    It dissolves in water, dissapear. We cannot see it.
  • What material is this?
    paper
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