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11.2 Types of Chemical Reactions>
Chapter 11
Chemical Reactions
11.1 Describing Chemical Reactions
11.2 Types of Chemical
Reactions
11.3 Reactions in Aqueous Solution
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Classifying
11.2 Types of Chemical Reactions> Reactions
Do Now:
Balance these chemical reactions.
1. ___ C2H4O4 + ___ O2 → ___ CO2 + ___ H2O
2. ___ Ni + ___ H2SO4 → ___ H2 + ___ Ni2(SO4)3
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Classifying
11.2 Types of Chemical Reactions> Reactions
Do Now:
Balance these chemical reactions.
1. 1 C2H4O4 + 1 O2 → 2 CO2 + 2 H2O
2. 2 Ni + 3 H2SO4 → 3 H2 + 1 Ni2(SO4)3
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Classifying
11.2 Types of Chemical Reactions> Reactions
5 Types of Chemical Reactions
• Combination
• Decomposition
• Single-replacement
• Double-replacement
• Combustion.
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combination Reactions
Two or more substances react to form a single
new substance.
A + B
2 Mg + O2
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AB
2 MgO
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combination Reactions
Two or more substances react to form a single
new substance.
A + B
AB
+
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combination Reactions
When a Group A metal and a nonmetal
react, the product is a binary ionic
compound.
2K(s) + Cl2(g) → 2KCl(s)
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combination Reactions
When two nonmetals react in a
combination reaction, more than one
product is often possible.
S(s) + O2(g) → SO2(g) sulfur dioxide
2S(s) + 3O2(g) → 2SO3(s) sulfur trioxide
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combination Reactions
More than one product may also result
from a transition metal and nonmetal.
Fe(s) + S(s) → FeS(s) iron(II) sulfide
2Fe(s) + 3S(g) → Fe2S3(s) iron(III) sulfide
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Classifying
11.2 Types of Chemical Reactions> Reactions
Decomposition Reactions
A single compound breaks down into two or more
products.
AB
2 BaO
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A + B
2Ba + O2
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Classifying
11.2 Types of Chemical Reactions> Reactions
Decomposition Reactions
A single compound breaks down into two or more
products.
AB
A + B
+
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Classifying
11.2 Types of Chemical Reactions> Reactions
Decomposition Reactions
A single compound breaks down into two or more
products.
AB
2H2O2
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A + B
2H2O + O2
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Classifying
11.2 Types of Chemical Reactions> Reactions
Single Replacement Reactions
One element replaces a second element in a
compound (based on activity series).
AB + C
AB + C
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AC + B
CB+A
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Classifying
11.2 Types of Chemical Reactions> Reactions
Single Replacement Reactions
One element replaces a second element in a
compound (based on activity series).
AB + C
AB + C
+
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AC + B
CB+A
+
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Classifying
11.2 Types of Chemical Reactions> Reactions
Single Replacement Reactions
One element replaces a second element in a
compound (based on activity series).
AB + C
AB + C
MgCl2 + 2Na
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2HCl + F2
AC + B
CB+A
Mg + 2NaCl
2HF + Cl2
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Classifying
11.2 Types of Chemical Reactions> Reactions
Single-Replacement Reactions
• The activity series of
metals lists metals in order
of decreasing reactivity.
• A reactive metal will replace
any metal listed below it in
the activity series.
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Activity Series of Metals
Decreasing reactivity
Whether one metal will
displace another metal from
a compound depends upon
the relative reactivities of the
two metals.
Name
Symbol
Lithium
Li
Calcium
Ca
Sodium
Na
Magnesium
Mg
Aluminum
Al
Zinc
Zn
Iron
Fe
Lead
Pb
Copper
Cu
Mercury
Hg
Silver
Ag
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Classifying
11.2 Types of Chemical Reactions> Reactions
Single-Replacement Reactions
A halogen can also replace another halogen from
a compound.
• The activity of halogens decreases as you go down
Group 7A of the periodic table—fluorine, chlorine,
bromine, and iodine.
• Bromine is more active than iodine, so this reaction
occurs:
Br2(aq) + 2NaI(aq) → 2NaBr(aq) + I2(aq)
• But bromine is less active than chlorine, so this
reaction does not occur:
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Br2(aq) + NaCl(aq) → No reaction
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Classifying
11.2 Types of Chemical Reactions> Reactions
Double-Replacement Reactions
Reactant cations exchange places to form new
compounds.
AB + CD
+
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AD + CB
+
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Classifying
11.2 Types of Chemical Reactions> Reactions
Double-Replacement Reactions
Reactant cations exchange places to form new
compounds.
AB + CD
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AD + CB
MgSO4 + K2CO3
K2SO4 + MgCO3
MgCl2 + 2HNO3
Mg(NO3)2 + 2HCl
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Classifying
11.2 Types of Chemical Reactions> Reactions
Combustion Reactions
A hydrocarbon reacts with oxygen to
produce carbon dioxide, water, and energy
(in the form of heat and light).
CxHy + O2
CO2 + H2O
2C8H18 + 25O2 → 16CO2 + 18H2O
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Classifying
11.2 Types of Chemical Reactions> Reactions
Now that you have learned about some of
the basic reaction types, you can predict
the products of many reactions.
• The number of elements and/or compounds
reacting is a good indicator of possible
reaction type and, thus, possible products.
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11.2 Types of Chemical Reactions>
END OF 11.2
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