Transcript Physical or Chemical Properties

Physical or Chemical Properties
Matter
Matter is anything that takes up space and
has mass.
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.
Five States of Matter
We are only going to
concern ourselves
Bose-Einstein
Condensates about
•
• Solids
• Liquids
the three
• Gases
• Plasmas
states of matter,
as are common
to our environment.
Three States of Matter
Solids
Liquids
Gases
By adding energy the state
changes.
gas
+energy
liquids
+ energy
solids
Examples of Physical Change
• 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
• gas bubbles
• color change - leaves turning colors in the
fall, rust appearing
• disappearance of color – fading fabric
• heat or light
Examples of Chemical Changes
•
•
•
•
•
•
•
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