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UNIT 2 – CHEMICAL REACTION
SSCIENCE 1206
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OUTLINE Law of Conservation of Mass Balancing Chemical Reactions Types of Chemical Reactions
Simple CompositionSimple DecompositionSingle ReplacementDouble ReplacementHydrocarbon Combustion
Predicting Reaction Types
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LAW OF CONSERVATION OF MASS
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LAW OF CONSERVATION OF MASS Mass CANNOT be created nor destroyed. As applied to a chemical reaction, the
MASS of the REACTANTS EQUALS the MASS of the PRODUCTS
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BALANCED CHEMICAL EQUATIONS Balanced chemical equations are a means
of representing the process in a chemical reaction, whereby REACTANTS form PRODUCTS, as per the Law of Conservation of Mass.
REACTANTS: STARTING MATERIALS PRODUCTS: NEW MATERIALS ARROW: “Goes to Form” or
“Yields” COEFFICIENTS: # in front of FORMULA EXAMPLE:
Iron + oxygen iron (III) oxide
4 Fe(s) + 3 O2(g) 2 Fe2O3(s)
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BALANCED CHEMICAL EQUATIONS Make a LIST of atoms for
REACTANTS and PRODUCTS. Count up the NUMBER OF ATOMS
on each side. ADD coefficients in front of the
chemical formulae until you have equal numbers on each side.
POINTS TO REMEMBER:Start with atom that appears in only 1 formula on each side first.
Lowest Common Multiple Rule for coefficients
Keep polyatomic ions together.
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HOMEWORK!!! Do the next 2 pages for homework!!!
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TYPES OF CHEMICAL REACTIONS SIMPLE COMPOSITION/SYNTHESIS (SC):
ELEMENT + ELEMENT COMPOUND
SIMPLE DECOMPOSITION (SD): COMPOUND ELEMENT + ELEMENT
SINGLE REPLACEMENT (SR): ELEMENT + COMPOUND ELEMENT + COMPOUND
DOUBLE REPLACEMENT (DR): COMPOUND + COMPOUND COMPOUND + COMPOUND
HYDROCARBON COMBUSTION (HC): CxHy + O2 CO2 + H2O
NEUTRALIZATION: ACID + BASE SALT + WATER
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CHEMICAL REACTIONS When studying our chemical
reactions, we will use the analogy of RELATIONSHIPS and DANCING!!!
CATIONS will be FEMALES (remember, they’re positive ions )
ANIONS will be MALES(remember, they’re negative ions )
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SIMPLE COMPOSITION REACTIONS
GENERAL EQUATION:Element + Element Compound
ANALOGY: RELATIONSHIPAmy+ Bob Amy-BobA + B A-B
EXAMPLES:4 Fe + 3 O2 2 Fe2O3
2 Na + Cl2 2 NaCl
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SIMPLE COMPOSITION . . .
PREDICT THE PRODUCTS:
_____ Li + _____ Cl2
_____ Mg + _____ N2
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SIMPLE DECOMPOSITION REACTIONS
GENERAL EQUATION:Compound Element + Element
ANALOGY: BREAKUPAmy-Bob Amy + Bob A-B A + B
EXAMPLES:8 FeS 8 Fe + S8
2 H2O 2 H2 + O2
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SIMPLE DECOMPOSITION . . .
PREDICT THE PRODUCTS:
_____ NO2
_____ Mg3P2
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HOMEWORK: Do next 2 sheets for homework.
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SINGLE REPLACEMENT REACTIONS
GENERAL EQUATION:Element + Compound Element +
Compound
ANALOGY: CHEATING!!! Amy-Bob + Cherise Amy + Cherise-
Bob Why, Bob, Why?
A-B + C A + C-B
EXAMPLES: 1 K + 1 NaCl 1 Na + 1 KCl
1 Cu + 2 AgNO3 2 Ag + 1 Cu(NO3)2
NEW! NEW!
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SINGLE REPLACEMENT PREDICT THE PRODUCTS:
_____ ZnS + _____ O2
_____ Br2 + _____ NaI
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SINGLE REPLACEMENT . . . WHAT’S WRONG WITH THE FOLLOWING
EQUATION?
2 NaI + 1 Br2 2 Na + 2 IBr
There are 2 NEGATIVE IONS put together on the PRODUCT SIDE.
IONIC COMPOUNDS are made up of a CATION and an ANION.
CORRECT EQUATION:
2 NaI + 1 Br2 2 NaBr + 1 I2
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DOUBLE REPLACEMENT REACTIONS
GENERAL EQUATION:Compound + Compound Compound +
Compound
ANALOGY: Switching Dance Partners Amy-Bob + Cherise-Dan Amy-Dan + Cherise-Bob
A-B + C-D A-D + C-B
EXAMPLES: 2 NaCl + 1 MgS 1 Na2S + 1
MgCl2
2 AgNO3 + 1 H2SO4 1 Ag2SO4 + 2 HNO3
NEW! NEW!
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DOUBLE REPLACEMENT PREDICT THE PRODUCTS:
____ Al(NO3)3 + ____ H2SO4
____ Pb(NO3)2 + ____ CaSO4
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DOUBLE REPLACEMENT . . . WHAT’S WRONG WITH THE FOLLOWING
EQUATION?
1 Ca(OH)2 + 1 MgCl2 1 CaMg + 2 ClOH
There are 2 NEGATIVE IONS and 2 POSITIVE IONS put together on the PRODUCT SIDE.
IONIC COMPOUNDS are made up of a CATION and an ANION.
CORRECT EQUATION:
1 Ca(OH)2 + 1 MgCl2 1 CaCl2 + 1 Mg(OH)2
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HOMEWORK!!!
Do the 2 sheets on SINGLE REPLACEMENT and DOUBLE REPLACEMENT that FOLLOW in your booklet!
Remember, CATIONS are always paired with ANIONS and “be positive before being negative”!
Also, REMEMBER your H2O2F2Br2I2N2Cl2 P4S8
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HYDROCARBON COMBUSTION
GENERAL EQUATION:CxHy + O2 CO2 + H2O
FOR TRICKY BALANCING, TRY THIS: Divide the SUBSCRIPT of the H in CxHy by 2. If your answer is:
EVEN BALANCE using C-H-OODD Add a “2” coefficient to the
CxHy and THEN BALANCE using C-H-O
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HYDROCARBON COMBUSTION PREDICT THE PRODUCTS: ____CH4 + ____O2 ____CO2 + ____
H2O
____ C2H6 + ____O2 ____CO2 + ____ H2O
____ C5H12 + ____O2 ____CO2 + ____ H2O
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NEUTRALIZATION GENERAL EQUATION:
ACID + BASE SALT + WATERAlso considered a DOUBLE REPLACEMENT
REACTION
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HOMEWORK
Do the following page on HYDROCARBON COMBUSTION for
homework.
Remember to use the little “trick” from the notes to keep these simple!!!
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