Types of Chemical Reactions
SYNTHESIS REACTIONS


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Involve the combination of smaller atoms and/or molecules into larger
molecules
General Formula:
Synthesis reactions can also involve small molecules coming together to form
bigger molecules.
Example:

When a ______or ______ reacts with oxygen, the product is an _____:
2Ca(s) + ___ (g) 
2H2(g) + ___(g) 
2CaO(s)
2H2O(l)

When a ______ reacts with a ________ to form an ______________:
2K(s) + Cl2(g)  2KCl(s)

When a ______________reacts with ______, the product is an _____:
SO3(g) + H2O(l)  H2SO4(aq)

When a ___________ reacts with _______, the product is a
__________________ (a base):
CaO(s) + H2O(l)  Ca(OH)2(aq)
DECOMPOSITION REACTIONS
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Involves the splitting of a large molecule into elements or smaller molecules.
General Formula : AB  A + B
Example:

Sometimes decomposition can involve the production of two small molecules
from one large one.
Example :
Single Displacement
Single displacement reactions are chemical changes that involve an element
and a compound as reactants
 One element replaces or displaces another element from a compound
Type 1:
Type 2:

Activity Series of Metals (Type 1- metal replaces a metal)
 Ranks reactivity of metals relative to each other
 Most reactive on the top
 An element can displace other elements below it

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H is the only nonmetal listed.
H2 may be displaced from acids or can be given off when a metal reacts with
H2O (producing H2 + metal hydroxide)
Examples:
Type 2: Non metal replacing non metal in a compound (Group 7)
Double Displacement Reaction
 elements in different compounds displace each other, producing two new
compounds
evidence that a double displacement reaction has taken place:

Ex. Type 1 (solubility guidelines)
BaCl2(aq) + K2SO4(aq) -->
MgCl2(aq) + KOH(aq) -->
Ex. Type 2 (table 2- Pg 176)
Na2S(aq) + HCl(aq) -->
Na2CO3(aq) + HCl(aq) -->
Ex. Type 3
HNO3(aq) + NaOH(aq) -->
Activity Series --> SD
Solubility Guidelines --> DD
Combustion
is a chemical reaction in which a fuel burns in oxygen

Complete Combustion  occurs when the oxygen supply is _________
Ex. ___CH4(g) + ___O2(g) --> ___CO2(g) + ___H2O(g) + energy

Releases the most energy from the fuel molecules and as result produces the
cleanest (least sooty) and hottest flames
Incomplete Combustion  occurs with the supply of oxygen is ________
 During incomplete combustion carbon dioxide, water and energy are produced,
however it also releases carbon monoxide and/or soot.
Incomplete combustion cannot be represented by a single chemical equation as so
many reaction products are possible