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Changes in matter
Science, Grade 3
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Study Guide Changes in matter Science, Grade 3
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1
/
3
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CHANGES
IN
MATTER
A
physical
change
is
when
something
changes
its
appearance
without
changing
its
makeup.
An
example
of
a
physical
change
is
chopping
wood.
An
example
of
a
chemical
change
is
burning
the
wood.
Lesson
Checkpoint:
What
is
a
physical
change?
Matter
can
change
from
one
state
to
another
state.
Matter
can
change
from
one
state
to
another
and
still
be
the
SAME
kind
of
matter.
For
example,
ice
and
water
are
the
same
kind
of
matter,
even
though
they
are
different
states
of
matter.
Ice
and
water
are
both
made
out
of
chemicals.
There
are
several
ways
matter
can
change
states.
One
way
this
happens
is
when
high
temperatures
causes
water
to
evaporate,
water
changes
from
a
liquid
to
a
gas.
When
water
is
heated
and
changes
from
a
liquid
to
a
gas,
it
changes
state
but
has
not
become
a
different
kind
of
matter.
When
matter
changes
from
a
liquid
to
a
gas,
the
water
particles
have
just
spread
out
so
that
you
can
no
longer
see
the
water.
You
can’t
see
the
water
because
it
became
an
invisible
gas
in
the
air.
When
matter
is
cooled,
it
can
also
cause
a
change
in
states.
An
ice
cube
is
a
solid
that
when
cooled
becomes
water
which
is
a
liquid.
When
water
is
in
a
liquid
state
and
is
heated,
the
water
will
soon
evaporate
and
become
a
gas.
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Lesson
Checkpoint:
What
is
an
example
of
matter
changing
states?
Many
different
kinds
of
matter
can
be
combined
together
to
form
a
mixture
which
is
when
two
or
more
kinds
of
matter
are
mixed
together.
A
bowl
of
mixed
nuts
is
an
example
of
a
mixture.
There
are
different
kinds
of
nuts
in
it.
When
two
or
more
kinds
of
matter
are
combined
together
to
form
a
mixture,
even
though
they
are
being
mixed
with
something
else,
the
kinds
of
matter
do
not
change.
Different
kinds
of
matter
can
sometimes
be
separated
from
a
mixture.
Lesson
Checkpoint:
What
is
a
mixture?
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A
solution
is
a
type
of
mixture.
A
solution
is
when
one
or
more
substances
are
dissolved
into
another.
An
example
of
a
solution
is
dissolving
sugar
into
a
glass
of
water.
Dissolve
means
to
break
into
particles
so
small
that
we
can
no
longer
see
the
particles.
The
dissolved
particles
seem
to
become
part
of
the
liquid.
Sometimes
you
can
separate
parts
of
a
solution
just
like
we
can
do
with
a
mixture.
For
example,
if
you
boil
salt
water,
water
will
evaporate
and
salt
will
remain
in
the
pan.
Sometimes,
however,
you
cannot
separate
parts
that
make
up
a
solution.
Lesson
Checkpoint:
What
is
an
example
of
a
solution?
Physical
changes
can
change
the
appearance
of
matter,
but
not
the
kind
of
matter
involved.
If
you
pour
water
on
a
rock,
it
is
still
a
rock,
but
it
is
now
wet.
Chemical
changes
result
when
matter
combines
to
produce
a
different,
new
kind
of
matter.
When
you
cook,
you
create
chemical
changes.
When
you
mix
the
ingredients
to
a
cake
together
and
then
bake
the
cake,
a
chemical
change
takes
place.
When
matter
has
gone
through
a
chemical
change,
it
usually
CAN’T
be
changed
back
into
the
matter
it
started
as.
Can
you
imagine
trying
to
get
the
egg
back
out
of
the
cake
after
you’ve
baked
it?!
When
you
bite
a
piece
of
food,
chew
the
food,
and
then
swallow
the
food,
it
is
an
example
of
a
chemical
change
because
your
saliva
breaks
down
the
pieces
of
food
so
you
can
swallow
and
digest
them.
The
saliva
creates
a
chemical
change.
Chemical
changes
supply
our
bodies
with
energy
which
we
need
to
grow
and
survive.
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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