chapter 9.2 types of reactions - the culp catalyst
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Chapter 9
Section 9.2
Classifying Chemical Reactions
Types of Reactions
Synthesis –
2 or more substances react to produce a single product
GENERAL EX: A + B AB
EX:
Types of Reactions Combustion -
oxygen combines with a substance and releases energy in the form of heat and light.
EX: C(s) + O2(g) CO2(g)
EX:
(Both equations above are also synthesis reactions)
Types of Reactions
Combustion -
Hydrocarbon combustion
General: CxHy+ oxygen carbon dioxide + water
CH4(g) + 2O2(g) CO2(g) + 2H2O(g)
+ +
Types of Reactions
Decomposition –
A single compound breaks down into two or more elements or new compounds
Decomposition reactions often require an energy source, such as heat, light, or electricity, to occur.
GENERAL EX: AB A + B
EX: 2NaN3(s) 2Na(s) + 3N2(g)
EX: 2H2O(l) 2H2(g) + O2(g)
+
Types of Reactions
Single Replacement (Single Displacement)
Atoms of one element replace the atoms of another element in a compound
Element + Compound New element and
New Compound
GENERAL EX: A + BX AX + B
EX: Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)
Types of Reactions
EX:
+ +
Types of Reactions
A metal will not always replace a metal in a compound dissolved in water because of differing reactivities.
An activity series can be used to predict if reactions will occur (right)
Types of Reactions
Double Replacement (Double Displacement)
occur when ions exchange between two compounds.
A solid formed during a Double replacement reactions is called a precipitate.
GENERAL EX: AX + BY AY + BX
EX: BaCl2(aq) + K2CO3(aq) BaCO3(s) + 2KCl(aq)
Types of Reactions
EX:
Types of Reactions
EX:
+ +
Identify the type of reaction
___________ CaCO3 CaO + CO2
___________ X + Y XY
_____/_____ 2Mg + O2 2MgO
___________ Na2S + CaBr2 2NaBr + CaS
Identify type of reaction
___________ 2C6H6 + 15O2 12CO2 + 6H2O
___________ Cu + AgNO3 Cu(NO3)2 + Ag
___________ WY2 + X2Z WZ + 2XY
___________ 2WXZ W2 + X2 + 2Z
Identify the type of reaction
__________
__________
__________
++
+ +
+
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