Chemical Reactions

http://bluebuddies.com/Smurfs_Black_and_White_Smurf_Pictures-52.htm

Review

Reactanta substance that enters into a chemical

reaction

Producta substance that is produced by a chemical reaction

Energy

Endothermic ReactionA chemical reaction in which energy is

absorbed (is a reactant) Examples?

Exothermic ReactionA chemical reaction in which energy is

released (is a product)Examples?

New Material

The Dance

Synthesis(combination)DecompositionSingle-displacement

(single-replacement)Double-displacement

(double-replacement)Combustion

Synthesis

A + B AB

___Mg + ___O2 ___MgO

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

Decomposition

AB A + B

___ H2O ___ H2 + ___ O2

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

Single Replacement

A + BC ---> AC + B

Mg + 2 H2O ---> Mg(OH)2 + H2

F2 + 2 KCl CI2 + 2 KF

• Note:

In single replacement reactions, “Like replaces like!”

What this means: metals replace metals or cations, nonmetals replace nonmetals, or anions!!

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

Double Replacement

AB + CD ---> AD + CB

___Pb(NO3)2 + ___KI ---> ___PbI2 + ___KNO3

Again, “Like replaces like.”

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

Combustion

a hydrocarbon combines with oxygen gas to produce carbon dioxide and water.

CnHn + O2 H2O + CO2

It is also called “burning.”

Recap

Synthesis(combination)

DecompositionSingle-displacementDouble-displacementCombustion

AB + C AC + BCnHn + O2 CO2 + H2O

A + B ABAB A + BAB + CD AD + CB

Practice

__NaOH + __KNO3 --> __NaNO3 + __KOH

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__CH4 + __O2 __CO2 + __H2O

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__Fe + __NaBr --> __FeBr3 + __Na

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__CaSO4 + __Mg(OH)2 __Ca(OH)2 + __MgSO4

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__NH4OH + __HBr __H2O + __NH4Br

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__Pb + __O2 __PbO2

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

__Na2CO3 __Na2O + __CO2

A.Synthesis(combination)B.DecompositionC.Single-replacementD.Double-replacementE.Combustion

Questions?