Transcript Physical or Chemical Properties

Physical or Chemical
Properties
Matter
Matter is anything that takes up space
and has mass.
Workbook – Read pages 170-171
Physical or Chemical
Matter can change in two ways –
physical or chemical.
Physical Change
With a physical change no new
substance is created and the original
matter can be recovered. Physical
change does not change the
composition of the matter. The original
matter is still present. The substance
may seem different, but the way the
atoms are linked up are the same.
Physical Change
Physical changes include:
 Changing the shape or size
 Dissolving
 Changing from one state of matter to
another
Matter
Matter can change from one state to
another by increasing or decreasing
temperature or pressure.
Read Workbook pages 172-173
Five States of Matter
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Bose-Einstein Condensates
Solids
Liquids
Gases
Plasmas
By adding energy the
state changes.
plasma
+ energy
gas
+energy
liquids
+ energy
solids
Examples of Physical
Change
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water evaporating or water changing
to steam
clothes drying in a dryer
chopping wood - wood ground to
sawdust
erosion
rock breaking
mixing Kool-Aid
Chemical Change
When a chemical change takes place,
a new substance is made. The old
matter is no longer present. The
matter can not be changed back into
its original state. The way the
molecules are linked up is different
when a chemical change takes place.
Signs of Chemical Change
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gas bubbles
color change - leaves turning colors in
the fall, rust appearing
disappearance of color – fading fabric
heat or light
Examples of Chemical
Changes
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fruit rotting, food spoiling
rust
decay of plants
burning wood
silver tarnishing
car burning gas
baking bread
Practice
Number your paper 1 – 10. Write
chemical or physical for each of the
following to describe the type of
change which is taking place.
1. Is this a physical or
chemical change?
dirt added to a puddle of water
2. Is this a physical or
chemical change?
making whip cream
3. Is this a physical or
chemical change?
baking soda fizzes with vinegar
4. Is this a physical or
chemical change?
sharpening a pencil
5. Is this a physical or
chemical change?
a stick broken into small pieces
6. Is this a physical or
chemical change?
sugar turns brown, then black with heat
7. Is this a physical or
chemical change?
using hot water to expand a metal cup
8. Is this a physical or
chemical change?
freezing water
9. Is this a physical or
chemical change?
cornstarch turns black with iodine
10. Is this a physical or
chemical change?
toasting a marshmallow
The Answers
1. Physical Change
dirt added to a puddle of water
2. Physical Change
making whip cream
3. Chemical Change
baking soda fizzes with vinegar
4. Physical Change
sharpening a pencil
5. Physical Change
a stick broken into small pieces
6. Chemical Change
sugar turns brown, then black with heat
7. Physical Change
using hot water to expand a metal cup
8. Physical Change
freezing water
9. Chemical Change
cornstarch turns black with iodine
10. Chemical Change
toasting a marshmallow