Post on 14-Dec-2015
AGENDA – May 25:AGENDA – May 25: Bonding Review – Any Questions?Bonding Review – Any Questions?
Notes – Chemical ReactionsNotes – Chemical Reactions
Class work – go over balancing Class work – go over balancing chemical equations challengechemical equations challenge
HW –complete balancing equations HW –complete balancing equations handouts - for extra help go to: handouts - for extra help go to: http://funbasedlearning.com/chemistry
AGENDA – May 26:AGENDA – May 26: Bonding QuizBonding Quiz
HW –go to: HW –go to: http://funbasedlearning.com/chemistry
Complete “Classic Chembalancer”Complete “Classic Chembalancer”
Chapter 21.6Chapter 21.6
Chemical ReactionsChemical Reactions
Goals of this chapter:Goals of this chapter:
• How to balance those equations How to balance those equations (remember Law of Conservation of (remember Law of Conservation of Mass)Mass)
• How to categorize chemical How to categorize chemical reactions: decomposition, reactions: decomposition, combustion, single replacement, combustion, single replacement, double replacement, combinationdouble replacement, combination
CHEMICAL REACTIONCHEMICAL REACTION
the changing of substances the changing of substances into other substances by the into other substances by the breaking of old bonds and breaking of old bonds and the formation of new bondsthe formation of new bonds
Consider the animation of the Consider the animation of the following following reaction::CHCH33CHCH22OH + HOH + H22SOSO44 H H22O + CO + C22HH44 + H + H22SOSO44
In a chemical reaction:In a chemical reaction:
the way in which atoms are the way in which atoms are joined together changesjoined together changes
as reactants are converted to as reactants are converted to products, the bonds that hold products, the bonds that hold atoms together are broken and atoms together are broken and new bonds are formed new bonds are formed
the atoms themselves are the atoms themselves are neither created nor destroyedneither created nor destroyed
REACTANTS REACTANTS PRODUCTS PRODUCTS
The atoms in the products The atoms in the products are the same atoms that are the same atoms that were in the reactants, were in the reactants,
they are just they are just
arranged differentlyarranged differently..
Symbols you will see and Symbols you will see and use when writing chemical use when writing chemical
equations:equations: ΔΔ heat added-written above heat added-written above
arrowarrow <=> reversible reaction<=> reversible reaction Any symbol written above Any symbol written above
the arrow in a reaction the arrow in a reaction indicates its use as a indicates its use as a catalystcatalyst
CatalystCatalyst
a substance that a substance that speeds up speeds up a reactiona reaction without being without being used up in the reaction used up in the reaction
The Law of Conservation of Mass number and type number and type number number
and typeand type
Balancing Chemical Balancing Chemical EquationsEquations
Save O and H for lastSave O and H for last If If polyatomicpolyatomic does not does not break apart across the break apart across the , , count it as one elementcount it as one element
Use trial and error: test Use trial and error: test various coefficientsvarious coefficients
To write a chemical equation To write a chemical equation correctly, the number of atoms correctly, the number of atoms on the left side of a chemical on the left side of a chemical equation (arrow) has to be equation (arrow) has to be precisely precisely balancedbalanced with the with the atoms on the right side of the atoms on the right side of the equation. equation.
Balancing Chemical Balancing Chemical EquationsEquations
writing chemical equations, the writing chemical equations, the number in front of the molecule's number in front of the molecule's symbol (symbol (coefficientcoefficient) indicates ) indicates the number of molecules the number of molecules participating in the reaction-if participating in the reaction-if no coefficient appears in front no coefficient appears in front of a molecule, we interpret this of a molecule, we interpret this as meaning one.as meaning one.
Balancing Chemical Balancing Chemical EquationsEquations
Try these:Try these: SS88 + O + O22 SO SO33
HgO HgO Hg + O Hg + O22
Zn + HCl Zn + HCl ZnCl ZnCl22 + H + H22
Na + HNa + H22O O NaOH + H NaOH + H22
FeFe22OO33 + H + H22 Fe + H Fe + H22OO
Answers:Answers: 1, 12, 81, 12, 8
2, 2, 12, 2, 1
1, 2, 1, 11, 2, 1, 1
2, 2, 2, 12, 2, 2, 1
1, 3, 2, 3 1, 3, 2, 3
and these…and these…
HH33POPO44 + HCl + HCl PCl PCl55 + H + H2200
HCl + KHCl + K22COCO33 KCl + H KCl + H22O + COO + CO22
Ca(ClOCa(ClO33))22 CaCl CaCl22 + O + O22
CC22HH55OH + OOH + O22 CO + H CO + H22OO
Xe + FXe + F22 XeF XeF66
Answers:Answers:
1, 5, 1,41, 5, 1,4
2, 1, 2, 1, 12, 1, 2, 1, 1
1, 1, 31, 1, 3
1, 2, 2, 31, 2, 2, 3
1, 3, 11, 3, 1
AGENDA -May:AGENDA -May:
Submit HWSubmit HW
Balancing Chemical Reactions Balancing Chemical Reactions ActivityActivity
HW – Describing Chemical HW – Describing Chemical Reactions WSReactions WS
AGENDA -May:AGENDA -May:
Submit HWSubmit HW
Notes – Chemical Reactions: Notes – Chemical Reactions: SynthesisSynthesis
Class work – Synthesis WS 1Class work – Synthesis WS 1
Homework – Synthesis WS 2Homework – Synthesis WS 2
Pre-ClassPre-Class
NHNH44NONO33 N N22O + HO + H22OO
AuAu22OO33 Au + O Au + O22
CC44HH1010 + O + O22 CO CO22 + H + H22OO
FeFe33OO44 + H + H22 Fe + H Fe + H22O O
II22 + HNO + HNO33 HIO HIO33 + NO + H + NO + H22
Answers:Answers:
1, 1, 21, 1, 2
2, 4, 32, 4, 3
2, 13, 8, 102, 13, 8, 10
1, 4, 3, 41, 4, 3, 4
2, 6, 4, 6, 12, 6, 4, 6, 1
5 Types of Chemical 5 Types of Chemical ReactionsReactions
Combination (synthesis)Combination (synthesis) DecompositionDecomposition Single replacementSingle replacement Double replacementDouble replacement CombustionCombustion
Combination (synthesis)Combination (synthesis)
ReactantsReactants: either 2 : either 2 elements OR 2 compoundselements OR 2 compounds
ProductProduct: MUST be a compound: MUST be a compound
USUALLY combination isUSUALLY combination is
2 reactants 2 reactants 1 product1 product
Combination (synthesis)Combination (synthesis)
ExamplesExamples
NN22 + 3H + 3H22 2NH 2NH33
2H2H22 + O + O22 2H 2H22OO
4P + 5O4P + 5O22 2P 2P22OO55
SS88 + 12O + 12O22 8SO 8SO33
Getting specific about Getting specific about synthesissynthesis::
Two or more reactants Two or more reactants one one productproduct
Examples: Examples:
Na + ClNa + Cl22
2Na + Cl2Na + Cl22 2NaCl 2NaCl
SynthesisSynthesis: Predicting : Predicting ProductsProducts
Rb + ClRb + Cl22
Rb + ClRb + Cl22 RbCl RbCl
2Rb + Cl2Rb + Cl22 2RbCl 2RbCl
K + ClK + Cl22
K + ClK + Cl22 KCl not balanced KCl not balanced
2K + Cl2K + Cl22 2KCl 2KCl
SynthesisSynthesis: Predicting : Predicting ProductsProducts
Ba + OBa + O22
Ba + OBa + O22 BaO not balanced BaO not balanced
2Ba + O2Ba + O22 2BaO 2BaO
Ca + BrCa + Br22
Ca + BrCa + Br22 CaBr CaBr2 2 balanced as isbalanced as is
AGENDA -May:AGENDA -May:
Submit HW & Pre-ClassSubmit HW & Pre-Class
Notes – Chemical Reactions: Notes – Chemical Reactions: DecompositionDecomposition
Class work – Decomposition WS #1Class work – Decomposition WS #1
Homework – Decomposition WS #2Homework – Decomposition WS #2
DecompositionDecomposition
The opposite of synthesisThe opposite of synthesis
22KClOKClO33 2KCl + 3O 2KCl + 3O22
2Ag2Ag22O O 4Ag + O 4Ag + O22
DecompositionDecomposition
Seltzer water (carbonic acid) Seltzer water (carbonic acid) decomposes to produce decomposes to produce
carbon dioxide and water:carbon dioxide and water:
HH22COCO33 CO CO22 + H + H22OO
Decomposition: Decomposition: one reactantone reactant, , two (or more products)two (or more products)
Getting specific about Getting specific about decompositiondecomposition::
one reactant one reactant two or more two or more products products
Exact opposite of a synthesis Exact opposite of a synthesis reactionreaction
Energy must be present (heat, Energy must be present (heat, light or electricity)light or electricity)
Examples of Examples of decompositiondecompositionthat you will have to be that you will have to be
able to do:able to do:LiBr LiBr LiBr LiBr Li Li + Br+ Br2 2 not balancednot balanced
2LiBr 2LiBr 2Li 2Li + Br+ Br22
MgO MgO MgO MgO Mg + O Mg + O22 not balanced not balanced
2MgO 2MgO 2Mg + O 2Mg + O22
AGENDA -MAY:AGENDA -MAY: Submit HWSubmit HW
Notes – Chemical Reactions: Notes – Chemical Reactions: Single ReplacementSingle Replacement
Class work – Mini-Lab: Balancing Class work – Mini-Lab: Balancing Chemical ReactionsChemical Reactions
Homework – Finish Mini-LabHomework – Finish Mini-Lab
Single replacementSingle replacement
one atom takes the place of one atom takes the place of another atom in a compound another atom in a compound
A + BC A + BC B + AC B + AC
A has replaced B in this A has replaced B in this reactionreaction
Single replacementSingle replacement
ExamplesExamples 2NaCl + F2NaCl + F22 2NaF + Cl 2NaF + Cl22
Na + HNa + H22O O NaOH + H NaOH + H22
K + MgBrK + MgBr22 KBr + Mg KBr + Mg
Single replacementSingle replacement
Are either Are either Two metals and one Two metals and one
nonmetalnonmetal
OROR Two nonmetals=halogens and Two nonmetals=halogens and
one metalone metal
Single replacementSingle replacement
Examples of two metals and one Examples of two metals and one nonmetalnonmetal
2Al + 3CuCl2Al + 3CuCl22 2AlCl 2AlCl33 + 3Cu + 3Cu
Single replacementSingle replacement
Examples of two nonmetals and Examples of two nonmetals and one metalone metal
Mg + HCl Mg + HCl MgCl MgCl22 + H + H22
Try these SR reactions:Try these SR reactions:Use the following steps:Use the following steps: Identify which reactants are switching Identify which reactants are switching placesplaces
Determine neutral ratio for new compoundDetermine neutral ratio for new compound Draw reaction arrow and complete reactionDraw reaction arrow and complete reaction
1.1. MgBrMgBr22 and Cl and Cl22
2. Al and Fe2. Al and Fe22OO33
3. CuS and Mg3. CuS and Mg
4. KI and F4. KI and F22
Answers:Answers:
1. 1. Magnesium Bromide and Chlorine Magnesium Bromide and Chlorine MgBrMgBr22 + Cl + Cl22 Bromine and ChlorineBromine and Chlorine ==> MgCl==> MgCl22 + Br + Br22
2. 2. Aluminum and Iron (III) OxideAluminum and Iron (III) Oxide Al + FeAl + Fe22OO33 Aluminum and IronAluminum and Iron ==> Fe + Al==> Fe + Al22OO33 2Al + Fe2Al + Fe22OO3 3 ==> 2Fe + Al==> 2Fe + Al22OO33
Answers:Answers:
Copper (II) Sulfide and Copper (II) Sulfide and MagnesiumMagnesium
CuS + MgCuS + Mg Copper and MagnesiumCopper and Magnesium ==> Cu + MgS==> Cu + MgS
Potassium Iodide and FluorinePotassium Iodide and Fluorine 2KI + F2KI + F22 Iodine and FluorineIodine and Fluorine ==> 2KF + I==> 2KF + I22
AGENDA 13-MAY:AGENDA 13-MAY: Submit HWSubmit HW
Notes – Chemical Reactions: Double Notes – Chemical Reactions: Double ReplacementReplacement
Class work – Mini Lab: Balancing DR Class work – Mini Lab: Balancing DR reactionsreactions
Homework – Finish DR mini lab & Test Homework – Finish DR mini lab & Test Friday!Friday!
DOUBLE REPLACEMENTDOUBLE REPLACEMENT
positive ions are always written positive ions are always written firstfirst when listing the product when listing the product
METALS are positive ions and METALS are positive ions and NON-METALS are negative ionsNON-METALS are negative ions
a positive must join with a a positive must join with a negative negative
Getting specific about Getting specific about double replacementdouble replacement::
Involves the exchange of Involves the exchange of positive cationspositive cations
Gas, precipitate or water is Gas, precipitate or water is always producedalways produced
Examples of Examples of double double replacement:replacement:
KBr + AgNOKBr + AgNO33
KBr + AgNOKBr + AgNO33 AgBr(s) + KNO AgBr(s) + KNO33 balanced balanced
Ppt formedPpt formed
HNOHNO33 + LiOH + LiOH
HNOHNO33 + LiOH + LiOH LiNO LiNO33 + H + H22O balancedO balanced
Water formedWater formed
Try theseTry theseSTRATEGY:STRATEGY:
Determine charge on all atoms present Determine charge on all atoms present and who is switchingand who is switching
Create neutral compoundsCreate neutral compounds Balance equation!Balance equation!
1.1. BaClBaCl22 (aq) + K (aq) + K22S (aq) S (aq)
2.2. FeS (s) + HCl (aq) FeS (s) + HCl (aq)
3.3. CaBrCaBr22(aq) + HCl (aq) + HCl
AnswersAnswers BaClBaCl22(aq) + K(aq) + K22S(aq)S(aq)
BaBa2+2+ Cl Cl1-1- + K + K1+1+ S S2-2- BaS + KClBaS + KCl BaClBaCl22(aq) + K(aq) + K22S(aq) S(aq) BaS(s) + 2KCl BaS(s) + 2KCl
FeS(s) + HCl(aq)FeS(s) + HCl(aq) FeFe2+2+ S S2-2- + H + H1+1+ Cl Cl1-1- HH22S + FeClS + FeCl22 FeS(s) + 2HCl(aq) FeS(s) + 2HCl(aq) H H22S(g) + FeClS(g) + FeCl22(aq)(aq)
Ca(OH)Ca(OH)22(aq) + 2HCl(aq)(aq) + 2HCl(aq) CaCa2+2+ OH OH1-1- + H + H1+1+ Cl Cl1-1- CaClCaCl22 + H + H22OO Ca(OH)Ca(OH)22(aq) + 2HCl(aq) (aq) + 2HCl(aq) CaCl CaCl22(aq) + 2H(aq) + 2H22OO
Getting specific about Getting specific about double replacementdouble replacement::
How to predict products:How to predict products:
ID cationsID cations Switch them!Switch them! Write proper formulasWrite proper formulas BalanceBalance
Examples of Examples of double double replacement:replacement:
FeClFeCl22 + K + K22S S
FeClFeCl22 + K + K22S S FeS + KCl not balanced FeS + KCl not balanced
FeClFeCl22 + K + K22S S FeS + 2KCl FeS + 2KCl
Pb(NOPb(NO33))22 + K + K22CrOCrO44
Pb(NOPb(NO33))22 + K + K22CrOCrO44 PbCrO PbCrO44 + KNO + KNO33
Pb(NOPb(NO33))22 + K + K22CrOCrO44 PbCrO PbCrO44 + 2KNO + 2KNO33
AGENDA -MAY:AGENDA -MAY:
Notes – Chemical ReactionsNotes – Chemical Reactions• Identifying combustion reactionsIdentifying combustion reactions
Class work – Reactions PacketClass work – Reactions Packet
Homework – Finish Packet & Test Homework – Finish Packet & Test Friday!Friday!
Combustion Combustion
ReactantsReactants: Carbon and : Carbon and Hydrogen containing compound Hydrogen containing compound reacting with oxygenreacting with oxygen
ProductProduct: Carbon dioxide and : Carbon dioxide and waterwater
CCxxHHyy + O + O22 COCO22 + + HH22OO
Getting specific about Getting specific about combustioncombustion::
Oxygen is present on the Oxygen is present on the reactant side.reactant side.
Hydrocarbon = CHydrocarbon = CxxHHyy
Products are always carbon Products are always carbon dioxide and waterdioxide and water
Examples of Examples of combustion:combustion:
CC22HH22 + O + O22
CC22HH22 + O + O22 CO CO22 + H + H22O not balancedO not balanced
CC22HH22 + 2.5O + 2.5O22 2CO 2CO22 + 1H + 1H22O O
2C2C22HH22 + 5O + 5O22 4CO 4CO22 + 2H + 2H22OO
CC33HH88 + O + O22 CC33HH88 + O + O22 CO CO22 + H + H22O not balancedO not balanced
CC33HH88 + 5O + 5O22 3CO 3CO22 + 4H + 4H22OO
AGENDA -MAY:AGENDA -MAY:
No Notes!No Notes!
Class work – Practice Test!Class work – Practice Test!
Homework – Study!Homework – Study!
Predicting Product Predicting Product Formation - How to write Formation - How to write
products:products:• Determine the type of reaction: Determine the type of reaction:
synthesis, decomposition, s/d synthesis, decomposition, s/d replacement, or combustionreplacement, or combustion
• Make sure elements present on Make sure elements present on left are present on rightleft are present on right
• Make sure all charges are net Make sure all charges are net zerozero
• Balance equation.Balance equation.
What we need to know for What we need to know for the Test:the Test:
Balance Chemical Equations!Balance Chemical Equations! Coefficients go in front of formulas, and Coefficients go in front of formulas, and multiply across them)multiply across them)
Subscripts DO NOT CHANGE!Subscripts DO NOT CHANGE!
Identify Chemical ReactionsIdentify Chemical Reactions Synthesis (one product)Synthesis (one product) Decomposition (one reactant)Decomposition (one reactant) Single Replacement (one element and one Single Replacement (one element and one compound)compound)
Double replacement (two ionic compounds, Double replacement (two ionic compounds, acids/bases)acids/bases)
Combustion (COCombustion (CO22 and H and H22O Products)O Products)
An OverviewAn Overview
Identifying ReactionsIdentifying Reactions One product?One product?
Synthesis ReactionSynthesis Reaction One reactant?One reactant?
DecompositionDecomposition One compound and one element?One compound and one element?
Single replacementSingle replacement Two compounds?Two compounds?
Double replacementDouble replacement One hydrocarbon (COne hydrocarbon (CxxHHyy) and oxygen?) and oxygen?
CombustionCombustion
An OverviewAn OverviewSYNTHESISSYNTHESIS
Write chemical formulas for Ionic Write chemical formulas for Ionic Compounds!Compounds!
Na + ClNa + Cl22
1.1. Determine charge on ionsDetermine charge on ions Na 1+; Cl 1-Na 1+; Cl 1-
2.2. Predict products and determine correct Predict products and determine correct ionic formulaionic formula
NaNa1+1+ + Cl + Cl1-1- NaCl NaCl
3.3. Balance Chemical Equation!Balance Chemical Equation! 22Na + ClNa + Cl22 22NaClNaCl
An OverviewAn OverviewDECOMPOSITIONDECOMPOSITION
MgBrMgBr22
1.1. Break two elements upBreak two elements up Mg; BrMg; Br
2.2. Identify diatomic elements (if any)Identify diatomic elements (if any) Bromine!Bromine!
3.3. Write out productsWrite out products MgBrMgBr22 Mg + BrMg + Br22
Balance chemical reactionBalance chemical reaction Balanced as is!Balanced as is!
An OverviewAn OverviewSINGLE REPLACEMENTSINGLE REPLACEMENT
Write chemical formulas for Ionic Write chemical formulas for Ionic Compounds!Compounds!
NaCl + KNaCl + K
1.1. Determine charge on ionsDetermine charge on ions Na 1+; Cl 1-; K 1+Na 1+; Cl 1-; K 1+
2.2. Predict products and switch ionsPredict products and switch ions1.1. NaNa1+1+ Cl Cl1-1- + K + K1+1+ K K1+1+ Cl Cl1-1- + Na + Na1+1+
Determine correct ionic formula (criss-Determine correct ionic formula (criss-cross)cross)
2.2. NaCl + K NaCl + K KCl + Na KCl + Na Balance Chemical Equation!Balance Chemical Equation!
Balanced as is!Balanced as is!
An OverviewAn Overview
You Try!You Try!
CaICaI22 + Li + Li
1.1. Determine charge on ionsDetermine charge on ions Ca 2+; I 1-; Li 1+Ca 2+; I 1-; Li 1+
2.2. Predict products and switch ionsPredict products and switch ions1.1. CaCa2+2+ I I1-1- + Li + Li1+1+ Li Li1+1+ I I1-1- + Ca + Ca2+2+
Determine correct ionic formula (criss-Determine correct ionic formula (criss-cross)cross)
CaICaI22 + Li + Li LiI + Ca LiI + Ca Balance Chemical Equation!Balance Chemical Equation!
CaICaI22 + + 22Li Li 22LiI + CaLiI + Ca
An OverviewAn OverviewDOUBLE REPLACEMENTDOUBLE REPLACEMENT
Write chemical formulas for Ionic Write chemical formulas for Ionic Compounds!Compounds!
CaCa33NN22 + NaI + NaI
1.1. Determine charge on ionsDetermine charge on ions Ca 2+; N 3-; Na 1+; I 1-Ca 2+; N 3-; Na 1+; I 1-
2.2. Predict products and switch ionsPredict products and switch ions CaCa2+2+ N N3-3- + Na + Na1+1+ I I1-1- Na Na1+1+ N N3-3- + Ca + Ca2+ 2+ I I1-1-
Determine correct ionic formula (criss-Determine correct ionic formula (criss-cross)cross)
CaCa33NN22 + NaI + NaI CaI CaI22 + Na + Na33NN
1.1. Balance Chemical Equation!Balance Chemical Equation! CaCa33NN22 + + 66NaI NaI 33CaICaI22 + + 22NaNa33NN
An OverviewAn Overview
You Try!You Try!
AlAl22OO33 + Zn(NO + Zn(NO33))22
1.1. Determine charge on ionsDetermine charge on ions Al 3+; O 2-; Zn 2+ NOAl 3+; O 2-; Zn 2+ NO3 3 1-1-
2.2. Predict products and switch ionsPredict products and switch ions AlAl3+3+ O O2-2- + Zn + Zn2+2+ NO NO33
1-1- Al Al3+3+ NO NO331-1- + Zn + Zn2+2+ O O2-2-
Determine correct ionic formula (criss-Determine correct ionic formula (criss-cross)cross)
AlAl22OO33 + Zn(NO + Zn(NO33))22 Al(NOAl(NO33))33 + ZnO + ZnO Balance Chemical Equation!Balance Chemical Equation!
AlAl22OO33 + + 33Zn(NOZn(NO33))22 22Al(NOAl(NO33))33 + + 33ZnOZnO
An OverviewAn OverviewCOMBUSTIONCOMBUSTION
Write chemical formulas for Ionic Write chemical formulas for Ionic Compounds!Compounds!
CC33HH88 + O + O22
1.1. Recognize combustion reactionRecognize combustion reaction
2.2. Predict productsPredict products CC33HH88 + O + O22 CO CO22 + H + H22O O
Balance Chemical Equation!Balance Chemical Equation!1.1. CC33HH88 + + 55OO22 33COCO22 + + 44HH22OO
An OverviewAn Overview
You Try!You Try!
CC22HH22 + O + O22
1.1. Recognize combustion reactionRecognize combustion reaction
2.2. Predict productsPredict products CC22HH22 + O + O22 CO CO22 + H + H22O O
Balance Chemical Equation!Balance Chemical Equation! 22CC22HH22 + + 55OO22 44COCO22 + + 22HH22OO
AGENDA 3-JAN:AGENDA 3-JAN:
Predicting Product formation Predicting Product formation QUEST THURSDAYQUEST THURSDAY1.1. Questions?Questions?
CW/REVIEW – Predicting Products CW/REVIEW – Predicting Products Practice testPractice test
Homework – Part I of labHomework – Part I of lab
AGENDA 4-JAN:AGENDA 4-JAN:
Predicting Product formation Predicting Product formation QUEST TOMORROWQUEST TOMORROW1.1. Questions?Questions?
CW/REVIEW – LABCW/REVIEW – LAB
Homework – STUDYHomework – STUDY
AGENDA 5-JAN:AGENDA 5-JAN:
QUESTQUEST
Pre-class (5 points)Pre-class (5 points)
1.1. Balance: Al + ClBalance: Al + Cl22 AlCl AlCl33
2.2. What type of reaction is this?What type of reaction is this?
3.3. What type of reaction is What type of reaction is characterized by the breaking characterized by the breaking apart of a single reactant? apart of a single reactant?
Pre-class (continued)Pre-class (continued)
4.4. What is the formula for What is the formula for sodium sulfate?sodium sulfate?
5.5. Balance: CHBalance: CH44 + O + O22 H H22O O + CO+ CO22
Pre-class (5 points)Pre-class (5 points)
1.1. What type of reaction is What type of reaction is described by two elements of described by two elements of compounds switching places?compounds switching places?
2.2. Identify the two contenders:Identify the two contenders:CaClCaCl22 + 2Li + 2Li 2LiCl + Ca2LiCl + Ca
3.3. What type of reaction is #2?What type of reaction is #2?
Pre-class (continued)Pre-class (continued)
4.4. What element is present in What element is present in every combustion reaction?every combustion reaction?
5.5. Complete this single Complete this single replacement reaction:replacement reaction:CuClCuCl22 + K + K
Pre-class (5 points)Pre-class (5 points)
1.1. Name the five types of Name the five types of chemical reactions we learned chemical reactions we learned about.about.
2.2. What kind of reaction is What kind of reaction is this: this: BaClBaCl22 + Na + Na22SOSO44 BaSO BaSO44 + NaCl + NaCl
BALANCE THIS REACTIONBALANCE THIS REACTION
Pre-class (continued)Pre-class (continued)
3.3. Write the product:Write the product:Na + ClNa + Cl22
4.4. Balance the above reactionBalance the above reaction
5.5. Write the products of this Write the products of this HYDROCARBON combustion:HYDROCARBON combustion:CC22HH44 + O + O22
Pre class (5 points)Pre class (5 points)
1.1. What are the compounds What are the compounds written on the LEFT side of written on the LEFT side of the arrow called?the arrow called?
2.2. TRUE or FALSE We can change TRUE or FALSE We can change subscripts in formulas to subscripts in formulas to balance a chemical equation?balance a chemical equation?
3.3. Balance this equation:Balance this equation:
Al + FeAl + Fe22OO33 Fe + Al Fe + Al22OO33