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Chemical Reactions
Physical Science - Middle School
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© Copyright NewPath Learning. All Rights Reserved. 94-4805
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+
+
+
+
+
C
+
O2
➞
CO2
2H2
+
O2
➞
2H2O
2H2O
➞
2H2
+
O2
Zn
+
2HCl
➞
ZnCl2
+
H2
NaCl
+
AgF
➞
NaF
+
AgCl
H2O
C6H12O6
Potassium
chloride
added
to
a
silver
nitrate
solution
forms
a
solid
precipitate.
Chemical
Reactions
Signs
of
Chemical
Reactions
A
chemical
reaction
is
a
process
in
which
one
or
more
substances
change
to
produce
one
or
more
new
ones.
Chemical
reactions
happen
all
around
us
–
lighting
a
match,
rusting
of
an
iron
bar,
or
the
tarnishing
of
a
silver
spoon.
Chemical
Formulas
A
chemical
formula
uses
symbols
to
identify
the
elements
in
a
compound
and
the
number
of
atoms
of
each
kind
present
in
a
molecule.
A
water
molecule
is
made
up
of
2
atoms
of
hydrogen
bonded
to
1
atom
of
oxygen.
A
glucose
molecule
is
made
up
of
6
atoms
of
carbon,
12
atoms
of
hydrogen,
and
6
atoms
of
oxygen.
Chemical
Equations
A
chemical
equation
uses
chemical
formulas
and
symbols
to
describe
a
chemical
reaction.
The
starting
materials
in
a
chemical
reaction
are
reactants.
The
resulting
substances
from
a
reaction
are
products.
The
reactants
are
always
placed
on
the
left
of
the
arrow,
and
the
products
on
the
right
of
the
arrow.
Types
of
Chemical
Reactions
Synthesis
Reaction
In
a
synthesis
reaction,
two
or
more
simple
substances
combine
to
form
a
compound.
For
example,
hydrogen
gas
combines
with
oxygen
gas
to
produce
water!
Decomposition
Reaction
In
a
decomposition
reaction,
a
compound
breaks
down
into
its
simpler
parts.
A
decomposition
reaction
is
the
reverse
of
synthesis
reaction.
For
example,
water
decomposes
to
form
hydrogen
gas
and
oxygen
gas.
Replacement
Reaction
Single
Replacement
In
a
single
replacement
reaction,
a
single
uncombined
element
replaces
another
in
a
compound.
The
products
of
such
a
reaction
are
a
new
compound
and
a
different
element.
For
example,
zinc
replaces
the
hydrogen
in
hydrochloric
acid
to
form
zinc
chloride
and
hydrogen
gas.
Double
Replacement
In
a
double
replacement
reaction,
ions
from
two
compounds
switch
places
to
form
two
new
compounds.
For
example,
silver
nitrate
reacts
with
sodium
chloride
to
form
two
new
compounds
-
silver
chloride
and
sodium
fluoride.
water
color
change
gas
formation
solid
formation
glucose
reactants
reactant
+
reactant
➞
product
reactant
➞
product
+
product
reactant
+
reactant
➞
product
+
product
reactant
+
reactant
➞
product
+
product
product
A
gas
is
formed
when
copper
is
added
to
nitric
acid.
These
simple
shapes
combine
to
form
a
new
object.
The
fish
shape
breaks
down
into
simpler
forms.
NaOH,
added
to
Phenol-
phthalein
solution
causes
a
color
change.
NaOH
© Copyright NewPath Learning. All Rights Reserved. 94-4805
www.newpathlearning.com
+
+
+
+
+
Zn
+
2HCl
➞
ZnCl2
+
H2
H2O
C6H12O6
NaCl
+
AgF
➞
NaF
+
AgCl
2H2O
➞
2H2
+
O2
reactant
➞
product
+
product
reactant
+
reactant
➞
product
+
product
reactant
+
reactant
➞
product
+
product
2H2
+
O2
➞
2H2O
reactant
+
reactant
➞
product
Chemical
Reactions
Signs
of
Chemical
Reactions
What
is
a
chemical
reaction?
____________________________
_____________________________________________________
_____________________________________________________
Chemical
Formulas
A
chemical
formula
uses
____________________
to
identify
the
____________________
in
a
compound
and
the
______________________________
of
each
kind
present
in
a
molecule.
A
water
molecule
is
made
up
of
_______
atoms
of
____________________
bonded
to
_______
atom
of
____________________
.
A
glucose
molecule
is
made
up
of
_______
atoms
of
___________________
,
_______
atoms
of
___________________
,
and
_______
atoms
of
____________________
.
Chemical
Equations
A
chemical
equation
uses
____________________
____________________
and
____________________
to
describe
a
chemical
reaction.
The
starting
materials
in
a
chemical
reaction
are
____________________
.
The
resulting
substances
from
a
reaction
are
____________________
.
The
____________________
are
always
placed
on
the
left
of
the
arrow,
and
the
____________________
on
the
right
of
the
arrow.
Types
of
Chemical
Reactions
Synthesis
Reactions
Describe
a
synthesis
reaction:
___________________________________
___________________________________
___________________________________
___________________________________
Decomposition
Reactions
Describe
a
decomposition
reaction:
_____________________________________
_____________________________________
_____________________________________
_____________________________________
_____________________________________
Replacement
Reactions
Single
Replacement
Describe
a
single
replacement
reaction:
_____________________________________
_____________________________________
_____________________________________
_____________________________________
_____________________________________
Double
Replacement
Describe
a
double
replacement
reaction:
_____________________________________
_____________________________________
_____________________________________
_____________________________________
water
glucose
These
simple
shapes
combine
to
form
a
new
object.
The
fish
shape
breaks
down
into
simpler
forms.
C
+
O2
➞
CO2
Key
Vocabulary
Terms
•
atom
•
chemical
equation
•
chemical
formula
•
chemical
reaction
•
compound
•
decomposition
reaction
•
double
replacement
reaction
•
element
•
product
•
reactant
•
single
replacement
reaction
•
synthesis
reaction
Synthesis
Reaction
Decomposition
Reaction
Replacement
Reaction
\|xiBAHBDy01799ozX
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