Do Now 5/12/15
Complete the following problems about Chemical Reactions:
1. Write the skeleton equation for this reaction: sulfur burns in
oxygen gas to form sulfur dioxide.
 2. Balance the following equation:
Al +
O2 
Al2O3
Types of Chemical Reactions
SLO 5/12/15
Students will be able to differentiate
between the five different types of
chemical reactions.
Homework…yes, there is homework!
Reading Assignment: Sec. 11.2
Written Assignment: pg. 367, #
21, 22, and 23
Vocabulary Review
 Word Equation
 Molar Mass
 Skeleton Equation
 Avogadro’s Number
 Balanced Equation
 Reactant
 Molar Volume
 Product
 Yield Sign
 Coefficient
 Mole
 Catalyst
Homework Check!
 Pg. 354, #7, 8, and 10
7.
8.
10.
What is kind of chemical reaction is
happening in chemical equations?
 We have looked at how to write out chemical equations
and balance them, but what is happening between the
reactants and the products?
Are new compounds being formed?
Are elements/compounds being burned?
Are elements switching with each other?
All of the above are true and we will explore the different
ways in which elements react with each other.
5 Classifications of Chemical Reactions
 5 different classifications are used to allow
us to predict products:
 Combination
 Decomposition
 Single-replacement
 Double-replacement
 Combustion
Combination Chemical Reactions
 Combination- synthesis reaction- two or more substances
combine to form a single substance.
 Product is always a single
compound
Example: A + B  AB
Decomposition Chemical Reactions
 Decomposition- a single compound is broken down into two
or more products
 Products will be 2 or more elements and/or compounds
Example: AB  A + B
 The constituent elements of the compound
 In other words, the elements that made up the compound are the products of
the reaction.
Decomposition Reaction
Single Replacement Chemical Reactions
 Single replacement/displacement- One element
replaces another element in a compound
 Products will be a different compound and a different element
Example: A + BC  B + AC
 Either the metal replaces the metal OR the nonmetal replaces the
nonmetal
 Use an activity series to determine if a reaction will actually occur!
Activity Series
 Activity Series- lists metals in order of decreasing
reactivity
 Used to predict which metals will replace which other
metals in a reaction
 More reactive (higher) solid metal can replace a less
reactive aqueous metal
 Nonmetals can also replace nonmetals in replacement
reactions.
 The activity of halogens decreases going down a group, so
Fluorine (F) can replace any of the others.
Activity Series
Single Replacement Reaction
Double Replacement Chemical Reactions
 Double replacement/displacement- an exchange of
positive ions between two reacting compounds
 Products will be 2 new compounds.
 Usually : One product is a precipitate, a gas, or a molecular
compound (covalent)
Example: AB + CD  AD + CB
Double Replacement
Combustion chemical reactions
 Combustion- An element or compound reacts with oxygen to
produce energy as heat and light. ALWAYS has O2 as a reactant.
 Often involve hydrocarbons
 Products will usually be CO2 and H2O- if combustion is
complete
Example: CxHx + O2  CO2 + H2O
 If combustion is incomplete:
 Soot and carbon monoxide form, so products would be C and
CO
Combustion Reaction
Let’s practice some examples of the
different types of reactions…
Oh what fun Mr. Mazella!
Exit Slip
 What are the five types of chemical reactions?
Give the sample equation for each.
Homework…yes, there is homework!
Reading Assignment: Sec. 11.2
Written Assignment: pg. 367, #
21, 22, and 23