physical changes of matter separating mixtures grade 3

1. What happens when
matter goes through a
physical change?

2. What is matter?
Matter is everything
around us that
takes space

3.  Matter can be:
(1) Solids:

4. (2) Liquids:

5. (3) Gases:
The air inside the balloon

6. Daddy, Can a
matter change?
Of course dear,
matter can
change
Really? How is
that?
Matter can
change its
shape & size,
let’s see….

7. It’s the change in the way matter
looks.
{ Matter may look different in shape &
size, but it’s still the same matter}
Physical change of matter

8. Examples
1- Tearing a sheet of paper
{It’s a kind of physical change, as the
shape & the size of the paper change,
but it is still the same paper}

9. 2- When we put water in freezer
{It’s a kind of physical change, as water
freezes into ice, so it change from
liquid to solid “ice” but it is still water }

10. 3- Pulling a rubber band
{It’s a kind of physical change, as when
we stretch a rubber band, it stretches
& return back to its size, But it is still
the same band }

11. Take care !!!!
- Burning a sheet of paper is not a
physical change, as if the paper is
burned to ash, it’s not a paper any
more & we cannot return it back to
paper again.

12. - Burning a match is not a physical
change, as when the match burns, it’s
not a match any more & we cannot
return it back to match again.

13. - Baking a Cake from eggs, milk &
flour is not a physical change, as we
cannot return back the cake into eggs,
milk & flour.

14. What is a mixture?
Mixture is formed when different kinds of
matter mixed together
Examples
:
Salad is a mixture of vegetables

15. Soil is a mixture of rocks & minerals
Air is a mixture of gases
Cocktail juice is a mixture of fruits

16. What is a solution?
Solution is a kind of mixtures, which is
formed when 2 or more kinds of matter are
mixed evenly “completely” into another kind
of matter
Examples
: Salt water is a solution
“When you mix salt with water, salt dissolve
(disappear) into the water, we don’t see it but
it is still in there”

17. Sugar with water is a solution

18. How can we separate mixtures?
1- Picking up
Examples
:1- Separating a mixture of meatballs & spaghetti
2- Separating mixture of nuts in a pack of nuts

19. 2- By Magnets
Examples
:
1- Separating a mixture of sand & paper clips
paper clips will be attracted to magnets & sand
will stay behind
1- Separating a mixture of flour & iron Filing's
Iron Filing's will be attracted to magnets & flour
will stay behind

20. 3- Filtration
Examples
:
- Separating a mixture of sand & water
Using filter paper sand will stay in the
filter paper & water will pass through

21.  When we heat water, it evaporates &
becomes gas.
4- Evaporation
Examples
:
- Separating a mixture of sugar & water
When we add sugar to water & stir, sugar
dissolves “disappear’ in the water,, to separate them:
Heat the mixture
Water evaporates
Sugar stays behind