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Section 11.2 lecture for Honors & Prep Chemistry
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Balance the following equations
Na3PO4 + KOH NaOH + K3PO4
MgF2 + Li2CO3 MgCO3 + LiF
P4 + O2 P2O3
RbNO3 + BeF2 Be(NO3)2 + RbF
The heat and smoke of burning charcoal are the products of a combustion reaction. Combustion is one of the five general types of chemical reactions. If you can recognize a reaction as being a particular type, you may be able to predict the products of the reaction.
The five general types of reaction are combination, decomposition, single-replacement, double-replacement, and combustion.
In a combination reaction two or more substances combine to form ONE new substance.
In a decomposition reaction a single compound breaks down into two or more simpler products.
In a single-replacement reaction one element replaces a second element in a compound.
The activity series lists metals in order of decreasing reactivity. It can be used to predict if a single-replacement reaction will occur.
In a double-replacement reaction positive ions are exchanged between two compounds.
for Conceptual Problem 11.7
In a combustion reaction an element or a compound reacts with oxygen, often producing energy in the form of heat and light.
The products of a combustion reaction are usually CO2 and H2O
The elements and/or compounds reacting are good indicators of the reaction type which can help you predict the reaction’s products.
2reactants1 product combination
1reactant 2 products decomposition
ionic + element single replacement
Two ionic reactants double replacement
__ + O2 CO2 + H2O combustion
1. What type of reaction is described by the following equation?
6Li + N2 2Li3N
a) combination reaction
b) decomposition reaction
c) single-replacement reaction
d) combustion reaction
2. Balance the following equation and indicate whether it represents a combustion, combination, or decomposition reaction.
H2SO4 H2O2 + SO2
a. H2SO4 H2O2 + SO2, combination
b. H2SO4 H2O2 + SO2, decomposition
c. H2SO4 2H2O2 + SO2, combination
d. H2SO4 2H2O2 + SO2, decomposition
3. Predict the missing product in the following unbalanced equation.
Pb(NO3)2 + KOH KNO3 + ____________
a. PbOH2
b. Pb(OH)4
c. Pb(OH)2
d. PbOH