Warm Up (Element or Compound)

Identify the following as either an element
or a compound:
Cl2
CuO
O2
S8
Na2S
SO3
P4
N2
CO2
MgF2
REMINDER!



Element: a substance that contains only
one type of atom
Compound: a substance that is composed
of atoms of different elements
NOW RE-CHECK YOUR ANSWERS
Warm Up (Element or Compound)

Identify the following as either an element
or a compound:
Cl2
CuO
O2
S8
Na2S
SO3
P4
N2
CO2
MgF2
Chemical Reactions
Thousands of reactions
But we are only concerned with
The “Basic 5 Types”
What is happening in common for
all of the following reactions?

2 Na + Cl2 →

N2 + 3 H2 →

2 Mg + O2 →

C + O2 →

2 NaCl
2 NH3
2 MgO
CO2
P4 + 6 Cl2 →
4 PCl3
Synthesis
Two or more simpler
substances come
together to form a
new substance
A + B  AB
Synthesis

Always makes one product out of multiple
reactants.
+
Synthesis
When magnesium is burned in the
presence of oxygen gas, magnesium
oxide is formed.
Magnesium + oxygen  magnesium oxide
2Mg + O2  2MgO
What is happening in common for
all of the following reactions?

2 HgO →
2 Hg + O2

2 H2O →
2 H2 + O2

2 NaCl →
2 Na + Cl2

CaCO3 →
CaO + CO2

H2SO4 →
H2O + SO3
Decomposition
A compound
breaks down
into two or more
simpler
substances
AB  A + B
Decomposition

Always takes one reactant and breaks
apart into simpler materials.
+
+
+
+
Decomposition
When hydrogen peroxide is in the
presence of sodium iodide, it breaks
down into water and oxygen gas.
(electrolysis of water)
Sodium
iodide
Hydrogen peroxide
Water + oxygen
2H2O2  2H2O + O2
What is happening in common for
all of the following reactions?

Fe + CuSO4 →
FeSO4 + Cu 
Cl2 + 2 NaBr →
2 NaCl + Br2

Zn + 2 HCl →

Mg + H2O →
ZnCl2 + H2 MgO + H2
Single replacement
One element replaces
another element in a
compound
AB + C  CB + A
Single Replacement

A single element replaces a positive or
negative ion in a compound.
Single Replacement
When copper reacts with silver
nitrate, silver and copper nitrate are
produced.
Copper + silver nitrate  silver + copper nitrate
Cu + AgNO3  CuNO3 + Ag
?? Activity series ??
What is happening in common for
all of the following reactions?

NaCl + AgNO3 → NaNO3 + AgCl

BaCl2 + Na2 SO4 →

2 HCl + FeS →
FeCl2 + H2S

HCl + NaOH →
NaCl + H2O
2 NaCl + BaSO4
Double replacement
Two ionic compounds in
aqueous solution
“switch partners” to
form at least one new
solid, liquid, or gas.
AB + CD  AD + CB
Double Replacement

The positive ions in two compounds switch
places in a reaction & make two new
compounds.
Positive ions
Double Replacement
When lead nitrate reacts with
potassium iodide, potassium nitrate
and lead iodide are produced.
Lead(II)nitrate + potassium iodide 
potassium nitrate + lead(II)iodide
Pb(NO3)2 + 2KI  2KNO3 + PbI2
What is happening in common for
all of the following reactions?

CH4 + 2 O2 →
CO2 + 2 H2O

2 C4H10 + 13 O2 →

C6H12O6 + 6 O2 →

2 C8H18 + 25 O2 →

C2H5OH + 3 O2 →
8 CO2 + 10 H2O
6 CO2 + 6 H2O
16 CO2 + 18 H2O
2 CO2 + 3 H2O
Combustion
Compounds (typically
with hydrogen and
carbon) are combined
with oxygen which
then produces carbon
dioxide and water
CxHy + O2  CO2 + H20
Combustion

A compound of carbon and hydrogen
reacts with oxygen gas and produces
carbon dioxide and water ALWAYS!!
+
+
Combustion
When ethanol reacts with oxygen
gas, water and carbon dioxide are
produced.
ethanol + oxygen  water + carbon dioxide
C2H5OH + 3O2  3H2O + 2CO2
YouTube Experiment


Culligan Bottle Experiment
Better View
Identify the type of reaction:
BaCl2 + Na2 SO4 → 2 NaCl + BaSO4
20%
1.
2.
3.
4.
5.
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5
Identify the type of reaction:
N2 + 3 H2 →
20%
1.
2.
3.
4.
5.
2 NH3
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5
Identify the type of reaction:
CaCO3 →
1.
2.
3.
4.
5.
CaO + CO2
20%
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5
Identify the type of reaction:
CH4 + 2 O2 →
1.
2.
3.
4.
5.
CO2 + 2 H2O
20%
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5
Identify the type of reaction:
Zn + 2 HCl →
ZnCl2 + H2
20%
1.
2.
3.
4.
5.
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5
Identify the type of reaction:
C6H12O6 + 6O2 →
1.
2.
3.
4.
5.
6CO2 + 6H2O
20%
20%
20%
2
3
20%
20%
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1
4
5