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