.Physical change
Some examples of Physical Changes:
Change of state is a common
any change in size, shape, form, or state where the
identity of the matter stays the same
a. Cutting a watermelon into
slices.
b. Bending steel
c. Tearing paper
d. Bending a pop can
e. Evaporation of milk
f. Melting wax
g. Orange juice being made from
fresh oranges
h. Wind and water erosion
i. A wall fell and broke into small
pieces
j. A building that has been
demolished
physical change:
solid-
- keeps own shape and volume
liquid-
- takes shape of container and keeps own volume
gas
takes shape of container and expands or contacts
to fill any container
Solid to liquid
(ice melting)
Liquid to solid
(water freezing)
Liquid to gas
(water boiling and creating steam) (evaporation of
water)
Gas to liquid
(water vapor condensing into water such as when
dew forms)
Chemical change
chemical property
one material changes into a different material with
different properties or
characteristics.
A characteristic of matter that allows it to
change to something new
new materials are formed that are different from
the starting materials.
In a chemical change,
A chemical change cannot easily be reversed.
Some examples of chemical changes include:
a.
b.
c.
d.
e.
f.
g.
digestion
a match burning
photosynthesis
paint drying
burning paper
oil burning
plant making food out of water
and carbon dioxide
h. leaves changing colors in the
fall
Some examples of chemical changes include:
Signs of chemical changes include
Leaves changing color indicates a chemical change
in nature caused by
Physical weathering
** digestion of a hamburger in
the stomach is a chemical change
** rusting of a car body
** baking soda in water reacting
with each other
the release or absorption of energy in the form of
light, heat, or sound; formation of a gas or solid,
not from a change of state, can indicate a
chemical change.
chlorophyll breaking down.
Weathering of Earth’s surface is a physical
change that takes place over long time
periods. Responsible for much of the
Earth's shape.
** Rocks breaking because of ice wedging
is physical weathering
** The loss of beachfront due to
erosion of sand by the ocean is an
example of physical weathering
can create new substances.
Chemical weathering
**acid rain- is a form of unnatural chemical
change caused by pollutants in the air.
** cave formations like stalactites
**pollution reacting with things to form new
substances
can create new substances.
Chemical weathering
**acid rain- is a form of unnatural chemical
change caused by pollutants in the air.
** cave formations like stalactites
**pollution reacting with things to form new
substances