5 TYPES OF REACTIONS
1.
2.
3.
4.
5.
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
1. SYNTHESIS
A+B
AB
Two substances combine to create a
compound.
Ex: 2Na + Cl2
2NaCl
1. SYNTHESIS
http://www.youtube.com/watch?v=A5H6DVe
5FAI
2. DECOMPOSITION
AB A+B
A single compound breaks down to
form two or more simpler
substances
Ex: 2H2O
2H2 + O2
2. DECOMPOSITION
http://www.youtube.com/watch?v=p1eG2y2
mn54
3. SINGLE DISPLACEMENT
A + BC B + AC
One element takes the place of
another in a compound
Ex: 3CuCl2 + 2Al
2AlCl3 + 3Cu
3. SINGLE DISPLACEMENT
http://www.youtube.com/watch?v=L03LHMX
rda4
4. DOUBLE REPLACEMENT
AB + CD AD + CB
Two elements change places forming two
new compounds. A precipitate is
usually formed.
Ex:
Pb(NO3)2 + K2CrO4 PbCrO4 + 2KNO3
4. DOUBLE REPLACEMENT
http://www.youtube.com/watch?v=tULcZsDf
oRA
5. COMBUSTION
CH4 + 2O2
CO2 + 2H2O
Oxygen is a reactant in every
combustion reaction.
Water and carbon dioxide are always
products.
5. COMBUSTION
http://www.youtube.com/watch?v=DjcztiNGg
_8
https://www.youtube.com/watch?v=UygUcM
kRy_c
CHEMICAL BONDS AND ENERGY
Chemical Energy = energy stored in the bonds of a substance
Breaking Bonds = requires energy
Conservation of Energy: Total energy before and after the reaction
is the same
EXOTHERMIC AND ENDOTHERMIC
• During chemical reactions energy is released or
absorbed
• Exothermic = reaction that releases energy (energy
released as bonds break is greater than the energy
needed to break the bond)
http://www.youtube.com/watch?v=znsPa1BSaIM
• Endothermic = absorbs energy from surroundings
(more energy is required to break bonds than is
released)
http://www.youtube.com/watch?v=GQkJI-Nq3Os