Types of Chemical Reactions. Reactants: Zn + I 2 Product: Zn I 2.

Types of Chemical ReactionsTypes of Chemical Reactions

Types of Chemical ReactionsTypes of Chemical Reactions

Reactants: Zn + IReactants: Zn + I22 Product: Zn IProduct: Zn I22

Types of Chemical Reactions:Types of Chemical Reactions:At the conclusion of our time together, At the conclusion of our time together,

you should be able to:you should be able to:

1.1. List the 5 basic types of chemical reactionsList the 5 basic types of chemical reactions2.2. Use this list to describe a reactionUse this list to describe a reaction

Decomposition

Simple Reactions

Synthesis(Combination)

SingleReplacement

DoubleReplacement

Decomposition

Synthesis

SingleReplacement

DoubleReplacement

A B A B+

A BA B +

A BA B +C+ C

A BAB +C+ CD D

Beware of the Guy Next to You!!!Beware of the Guy Next to You!!!

Types of ReactionsTypes of Reactions

• There are five types of chemical There are five types of chemical reactions we will talk about:reactions we will talk about:

1.1. Synthesis reactionsSynthesis reactions

2.2. Decomposition reactionsDecomposition reactions

3.3. Single displacement reactionsSingle displacement reactions

4.4. Double displacement reactionsDouble displacement reactions

5.5. Combustion reactionsCombustion reactions• You need to be able to identify the type You need to be able to identify the type

of reaction and predict the product(s)of reaction and predict the product(s)

Steps to Writing ReactionsSteps to Writing Reactions

• Some steps for doing reactionsSome steps for doing reactions

1.1. Identify the type of reactionIdentify the type of reaction

2.2. Predict the product(s) using the type of Predict the product(s) using the type of reaction as a modelreaction as a model

3.3. Balance itBalance it

Don’t forget about the diatomic elements! Don’t forget about the diatomic elements! (BrINClHOF) or (7 + 1) (BrINClHOF) or (7 + 1)

For example, Oxygen is OFor example, Oxygen is O2 2 as as anan element.element.

In a compound, it can’t be a diatomic In a compound, it can’t be a diatomic element because it’s not an element element because it’s not an element anymore, it’s a compound!anymore, it’s a compound!

Synthesis ReactionsSynthesis Reactions

Synthesis Reactions:Synthesis Reactions:At the conclusion of our time together, At the conclusion of our time together,


1.1. Recognize a synthesis chemical reactionRecognize a synthesis chemical reaction2.2. Balance this reaction typeBalance this reaction type

When Your Back is Up Against It….

Decomposition

Simple Reactions


SingleReplacement

DoubleReplacement

Decomposition

Synthesis

SingleReplacement

DoubleReplacement

A B A B+

A BA B +

A BA B +C+ C

A BAB +C+ CD D

What Do You Call Four Bullfighters What Do You Call Four Bullfighters In Quicksand?In Quicksand?

Quatro CincoQuatro Cinco

Synthesis reactionsSynthesis reactions• Synthesis reactionsSynthesis reactions occur when two occur when two

substances (generallysubstances (generally elementselements) combine ) combine and form a compound. (Sometimes these and form a compound. (Sometimes these are called combination or addition reactions.)are called combination or addition reactions.)

reactant + reactant reactant + reactant 1 product 1 product• Basically: Basically: A + B A + B AB AB

• Example: Example: 2H2H2 2 + O+ O2 2 2H 2H22OO

• Example:Example: CC + O+ O2 2

COCO22

Synthesis ReactionsSynthesis Reactions• Here is another example of a synthesis Here is another example of a synthesis

reactionreaction

Synthesis ReactionSynthesis Reaction

• Predict the products and balance the Predict the products and balance the following reaction:following reaction:

Na + ClNa + Cl2 2

NaClNaCl

2 Na + Cl2 Na + Cl22 2 NaCl 2 NaCl

Synthesis Reactions =Synthesis Reactions =

• One main purpose:One main purpose:

• To make a more complex compound!!To make a more complex compound!!

Septic Tank Humor

Synthesis Reactions:Synthesis Reactions:Let’s see if you can:Let’s see if you can:

1.1. Recognize a synthesis chemical reactionRecognize a synthesis chemical reaction2.2. Balance this reaction typeBalance this reaction type

PracticePractice

• Predict the products. Write and balance Predict the products. Write and balance the following synthesis reaction equations.the following synthesis reaction equations.

• Sodium metal reacts with chlorine gas Sodium metal reacts with chlorine gas

NaNa(s) (s) + Cl+ Cl2(g) 2(g) • Solid Magnesium reacts with fluorine gasSolid Magnesium reacts with fluorine gas

MgMg(s) (s) + F+ F2(g) 2(g) • Aluminum metal reacts with fluorine gasAluminum metal reacts with fluorine gas

AlAl(s) (s) + F+ F2(g) 2(g)

NaCl

MgF2

AlF3

PracticePractice

• State the type, predict the products and State the type, predict the products and balance the following reactions:balance the following reactions:

Cesium reacts with bromine gas Cesium reacts with bromine gas

Cs + BrCs + Br2 2

CsBrCsBr

2 Cs + Br2 Cs + Br22 2 CsBr 2 CsBr

All You Really Need To Know All You Really Need To Know You Can Learn From Noah's Ark You Can Learn From Noah's Ark

9.9. Speed isn't always an Speed isn't always an advantage; the snails were advantage; the snails were on board with the cheetahs. on board with the cheetahs.

10.10. When you're stressed, float When you're stressed, float awhile. awhile.

I don’t feel so stupid now…

Decomposition ReactionsDecomposition Reactions

Decomposition Reactions:Decomposition Reactions:At the conclusion of our time together, At the conclusion of our time together,


1.1. Identify decomposition chemical reactionsIdentify decomposition chemical reactions2.2. Balance this type of reactionBalance this type of reaction

R U Whining????!!!!

Decomposition ReactionsDecomposition Reactions• Decomposition reactionsDecomposition reactions occur when a occur when a

compound breaks up into the elements or compound breaks up into the elements or in a few to simpler compoundsin a few to simpler compounds

• 1 Reactant 1 Reactant Product + Product Product + Product • In general: AB In general: AB A + B A + B• Example: 2 HExample: 2 H22O O 2H 2H22 + O + O22

• Example: 2 HgO Example: 2 HgO

2Hg + O2Hg + O22

Are you wondering if this can get much worse???

Decomposition ReactionsDecomposition Reactions• For Decomposition reactionsFor Decomposition reactions to to occur occur

we need energy as a catalyst in the form we need energy as a catalyst in the form of:of:

• HeatHeat• LightLight• ElectricityElectricity• Mechanical shockMechanical shock• Or a chemical catalystOr a chemical catalyst

Decomposition ReactionsDecomposition Reactions• Another view of a decomposition reaction:Another view of a decomposition reaction:

Decomposition ExceptionsDecomposition Exceptions

• Carbonates and chlorates are special case Carbonates and chlorates are special case decomposition reactions that do not go to decomposition reactions that do not go to the elements. You should be able to the elements. You should be able to recognize these as decomposition only.recognize these as decomposition only.• Carbonates (COCarbonates (CO33

2-2-) decompose to carbon ) decompose to carbon dioxide and a metal oxidedioxide and a metal oxide

• Example: CaCOExample: CaCO3 3 CO CO22 + CaO + CaO• Chlorates (ClOChlorates (ClO33

--) decompose to oxygen ) decompose to oxygen gas and a metal chloridegas and a metal chloride

• Example: 2 Al(ClOExample: 2 Al(ClO33))3 3 2 AlCl 2 AlCl33 + 9 O + 9 O22

Decomposition ExceptionsDecomposition Exceptions

• Ternary acids will tend to decompose to Ternary acids will tend to decompose to water and the nonmetal oxide.water and the nonmetal oxide.

• Example: HExample: H22SOSO33 H H22O + SOO + SO22• There are other special cases, but we There are other special cases, but we

will not explore those in this classwill not explore those in this class

Practice of DecompositionPractice of Decomposition

• Predict the products and balance the Predict the products and balance the following reactions:following reactions:

HH22OO

HH22 + O + O22

2 H2 H22O O 2 H2 H22 + O + O22

PracticePractice

• Predict the products. Then, write and Predict the products. Then, write and balance the following decomposition balance the following decomposition reaction equations:reaction equations:

• Solid Lead (IV) oxide decomposesSolid Lead (IV) oxide decomposes PbO PbO2(s) 2(s)

• Aluminum nitride decomposes Aluminum nitride decomposes

AlNAlN(s)(s)

Pb + O2

Al + N2

What Do Eskimos Get From Sitting On What Do Eskimos Get From Sitting On The Ice too Long?The Ice too Long?

PolaroidsPolaroids

Decomposition:Decomposition:Let’s see if you can:Let’s see if you can:

1.1. Identify decomposition chemical reactionsIdentify decomposition chemical reactions2.2. Balance this type of reactionBalance this type of reaction

PracticePractice

Identify the type of reaction for each of the Identify the type of reaction for each of the following decomposition reactions, and following decomposition reactions, and write the balanced equation:write the balanced equation:

BaCOBaCO3(s)3(s)

NINI3(s) 3(s)

BaO + CO2

N2 + I2 2, 1, 3

Practice of DecompositionPractice of Decomposition


• Iron (II) oxide decomposes Iron (II) oxide decomposes

FeO FeO Fe + OFe + O22

2 FeO 2 FeO 2 Fe + O2 Fe + O22

PracticePractice

Identify the type of reaction for each of the Identify the type of reaction for each of the following synthesis or decomposition following synthesis or decomposition reactions, and write the balanced equation:reactions, and write the balanced equation:

NN2(g) 2(g) + O+ O2(g)2(g)

BaCOBaCO3(s)3(s)

CoCo(s) (s) + S+ S(s) (s)

NINI3(s) 3(s)

(Co = +3)

Nitrogen monoxide2 NO

BaO + CO2

Co2S3

2, 3, 1

N2 + I2

2, 1, 3

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POOP DOC

Single DisplacementSingle Displacement

Septic Tank HumorSeptic Tank Humor

Single Displacement:Single Displacement:At the conclusion of our time together, At the conclusion of our time together,


1.1. Identify a basic single Identify a basic single displacement reactiondisplacement reaction

2.2. Use the reactivity series table to Use the reactivity series table to determine if the reaction will determine if the reaction will take placetake place

3.3. Balance a single displacement Balance a single displacement reactionreaction

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Single Replacement ReactionsSingle Replacement Reactions

• Single Replacement Reactions occur when one Single Replacement Reactions occur when one element replaces another in a compound.element replaces another in a compound.

• A metal can replace a metal (+) A metal can replace a metal (+) OROR a halogen can replace a halogen (-). a halogen can replace a halogen (-).

• element + compoundelement + compound element + element + compound compound A + BC A + BC AC + B AC + B (if A is a metal)(if A is a metal) ORORA + BC A + BC BA + C BA + C (if A is a (if A is a halogen ) )

(remember the cation always goes first!)(remember the cation always goes first!)


• For these reactions, you must remember:For these reactions, you must remember:

When HWhen H22O splits into ions, it splits O splits into ions, it splits into Hinto H++ and OH and OH-- (not H+ and O (not H+ and O-2-2 !!) !!)

A single replacement reaction will only occur if A single replacement reaction will only occur if the replacement ion has a higher activity the replacement ion has a higher activity than the original ion in the compoundthan the original ion in the compound

To determine this, refer to a relative activity To determine this, refer to a relative activity tabletable

Relative ActivitiesRelative ActivitiesMetalsMetals Decreasing Activity Decreasing Activity HalogensHalogens

Lithium, LiLithium, Li Fluorine, FFluorine, F

Potassium, KPotassium, K Chlorine, Chlorine, ClCl

Calcium, CaCalcium, Ca Bromine, BrBromine, Br

Sodium, NaSodium, Na Iodine, IIodine, I

Magnesium, MgMagnesium, Mg

Aluminum, AlAluminum, Al

Zinc, ZnZinc, Zn Hydrogen, HHydrogen, H

Chromium, CrChromium, Cr Copper, CuCopper, Cu

Iron, FeIron, Fe Mercury, HgMercury, Hg

Nickel, NiNickel, Ni Silver, AgSilver, Ag

Tin, SnTin, Sn Platinum, PtPlatinum, Pt

Lead, PbLead, Pb Gold, Au Gold, Au


• (note: Li is higher relative activity than H):(note: Li is higher relative activity than H):

A Displacement Reaction:metallic copper with silver nitrate

Cu + Ag NO3Cu + Ag NO3

Ag + Cu(NO3)2Ag + Cu(NO3)2

Note: Cu is higher relative activity

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• Write and balance the following Write and balance the following single replacement reaction single replacement reaction equation:equation:

• Zinc metal reacts with aqueous Zinc metal reacts with aqueous hydrochloric acidhydrochloric acid

ZnZn(s) (s) + HCl+ HCl(aq)(aq)

ZnClZnCl22 + H + H2(g)2(g)

Note: Zinc replaces the Note: Zinc replaces the hydrogen ion in the reaction hydrogen ion in the reaction because of higher relative because of higher relative activityactivity

2

Single ReplacementSingle Replacement

• Aluminum metal reacts with Aluminum metal reacts with aqueous copper (II) nitrate aqueous copper (II) nitrate

AlAl(s)(s)+ Cu(NO+ Cu(NO33))2(aq)2(aq)

Al(NOAl(NO33))3(aq)3(aq) + Cu + Cu

22 AlAl(s)(s)+ 3 Cu(NO+ 3 Cu(NO33))2(aq)2(aq)

2 Al(NO2 Al(NO33))3(aq)3(aq) + 3 + 3 CuCu

Interesting Signs:Interesting Signs:

Single Displacement:Single Displacement:Let’s see if you can:Let’s see if you can:

1.1. Identify a basic single Identify a basic single displacement reactiondisplacement reaction

2.2. Use the reactivity series table to Use the reactivity series table to determine if the reaction will determine if the reaction will take placetake place

3.3. Balance a single displacement Balance a single displacement reactionreaction

Try This…Try This…

• Predict the products and Predict the products and balance the following balance the following reactions:reactions:

• Zinc reacts with aqueous Zinc reacts with aqueous copper (II) sulfatecopper (II) sulfate

• Zinc is higher relative activity Zinc is higher relative activity so… Zn + CuSOso… Zn + CuSO4 4

Cu + Cu + ZZnnSOSO44

Familiar SayingFamiliar Saying

It is fruitless to become lachrymost because of scattered lacteal fluid.

Don’t cry over spilled milk??

Try This…Try This…


• Copper (II) reacts with aqueous calcium Copper (II) reacts with aqueous calcium sulfatesulfate

• Cu + CaSOCu + CaSO4 4

• Copper is lower relative activity so…Copper is lower relative activity so…• Cu + CaSOCu + CaSO4 4 NR NR

Try These Last Two:Try These Last Two:

• Sodium chloride solid reacts with fluorine gas Sodium chloride solid reacts with fluorine gas

NaClNaCl(s) (s) + F+ F2(g) 2(g) NaF NaF(s) (s) + Cl+ Cl2(g)2(g)

Note that fluorine replaces Note that fluorine replaces chlorine in the chlorine in the compoundcompound

• Aluminum metal reacts with aqueous copper (II) Aluminum metal reacts with aqueous copper (II) nitrate nitrate

AlAl(s)(s)+ Cu(NO+ Cu(NO33))2(aq)2(aq)

Al(NOAl(NO33))3(aq)3(aq) + Cu + Cu

2, 3, 2, 3 2, 3, 2, 3

Demo Time!!Demo Time!!

2 2

I don’t feel so stupid now…I don’t feel so stupid now…

Double DisplacementDouble Displacement

Decomposition

Simple Reactions


SingleReplacement

DoubleReplacement

Decomposition

Synthesis

SingleReplacement

DoubleReplacement

A B A B+

A BA B +

A BA B +C+ C

A BAB +C+ CD D

Double Displacement:Double Displacement:At the conclusion of our time together, At the conclusion of our time together,


1.1. List the types of chemical reactions that List the types of chemical reactions that we’ve covered so farwe’ve covered so far

2.2. Identify a double displacement reactionIdentify a double displacement reaction3.3. Determine the products of a double Determine the products of a double

displacement reaction by the foil methoddisplacement reaction by the foil method4.4. Balance a double displacement reactionBalance a double displacement reaction

Murphy's LawsMurphy's Lawsofof

Science and TechnologyScience and Technology

Any instrument when dropped will roll into the least accessible corner.

Double Replacement ReactionsDouble Replacement Reactions

• Double Replacement Reactions Double Replacement Reactions occur when occur when a metal replaces a metal in a compound and a a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compoundnonmetal replaces a nonmetal in a compound

• Compound + compound Compound + compound compound+ compound+ compoundcompound

• AB + CD AB + CD AD + CB AD + CB

Double Replacement ReactionsDouble Replacement Reactions

• Think about it like “foil”ing in algebra, first and Think about it like “foil”ing in algebra, first and last ions go together + inside ions go togetherlast ions go together + inside ions go together

• Example:Example:

AgNOAgNO3(aq) 3(aq) + NaCl+ NaCl(s) (s)

AgClAgCl(s) (s) + NaNO+ NaNO3(aq)3(aq)

• Another example:Another example:

KK22SOSO4(aq) 4(aq) + Ba(NO+ Ba(NO33))2(aq) 2(aq)

KNOKNO3(aq)3(aq) + BaSO + BaSO4(s) 4(s) 2

3 Driving Forces for Double Replacement 3 Driving Forces for Double Replacement ReactionsReactions

• Water Forms• Gas Forms• Solid Forms• If one of the above is not a

product, there will be no reaction.

Double Displacement Reactions Double Displacement Reactions

KK22CrOCrO4(aq)4(aq) + Ba(NO + Ba(NO33))2(aq)2(aq)

BaCrOBaCrO4(s)4(s) + 2 + 2

KNOKNO3(aq)3(aq)

SolubleSoluble Soluble Soluble

Insoluble SolubleInsoluble Soluble

Driving Force?Driving Force?

Solid Forms (Precipitate)Solid Forms (Precipitate)

Neutralization ReactionNeutralization Reaction

Acid + Base Acid + Base Salt + Water Salt + Water

HCl + NaOH HCl + NaOH

NaCl + HNaCl + H22OO

SolubleSoluble Soluble Soluble

Soluble MolecularSoluble Molecular

Driving Force?Driving Force?

Water FormsWater Forms

PracticePractice

• Predict the products. Balance the equationPredict the products. Balance the equation

1.1. FeClFeCl3 (aq) 3 (aq) + NaOH+ NaOH(aq) (aq)

2.2. HH22SOSO44(aq)(aq) + NaOH + NaOH(aq)(aq)

3.3. KOHKOH(aq)(aq) + CuSO + CuSO4 (aq) 4 (aq)

4.4. Ba(NOBa(NO33)) 2(aq) 2(aq) + K+ K22CrOCrO4 (aq) 4 (aq)

5.5. Demo Time!! Demo Time!!

NaCl + Fe(OH) 3

Na2SO4 + H2O

Cu(OH) 2 + K2SO4

BaCrO4 + KNO3

Familiar SayingFamiliar Saying

One pyrus malus per diem restrains the arrival of the Hippocratic apostle.

An apple a day keeps the doctor away!!

Double Displacement:Double Displacement:Let’s see if you can:Let’s see if you can:

1.1. List the types of chemical reactions that List the types of chemical reactions that we’ve covered so farwe’ve covered so far

2.2. Identify a double displacement reactionIdentify a double displacement reaction3.3. Determine the products of a double Determine the products of a double

displacement reaction by the foil methoddisplacement reaction by the foil method4.4. Balance a double displacement reactionBalance a double displacement reaction

Practice Quiz Practice Quiz

Write the double displacement reaction and Write the double displacement reaction and give the driving force: give the driving force:

Silver nitrate reacts with calcium chlorideSilver nitrate reacts with calcium chloride

AgNOAgNO33 + CaCl + CaCl22

AgCl + Ca(NOAgCl + Ca(NO33))22

2AgNO2AgNO33 + CaCl + CaCl22 2AgCl + Ca(NO 2AgCl + Ca(NO33))22

Every compound above is soluble except for silver chloride.

What is the driving force?Solid Forms

PracticePractice

• Predict the products. Don’t balance the Predict the products. Don’t balance the equation.equation.

1.1. HClHCl(aq)(aq) + AgNO + AgNO33(aq) (aq)

2.2. CaClCaCl22(aq) (aq) + Na+ Na33POPO4 (aq) 4 (aq)

3.3. Pb(NOPb(NO33)) 2(aq) 2(aq) + BaCl+ BaCl2 (aq) 2 (aq)

4.4. Demo Time!! Demo Time!!

AgCl + HNO3

NaCl + Ca3

(PO4) 2

Ba(NO3) 2 + PbCl2

The Final Reaction TypeThe Final Reaction TypeCombustionCombustion

Combustion:Combustion:At the conclusion of our time together, At the conclusion of our time together,


1.1. Identify a basic combustion Identify a basic combustion reactionreaction

2.2. Predict the products of Predict the products of combustion reactionscombustion reactions

3.3. Balance this reaction typeBalance this reaction type

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Combustion ReactionsCombustion Reactions

• Combustion reactions Combustion reactions occur when a hydrocarbon occur when a hydrocarbon reacts with oxygen gas.reacts with oxygen gas.

• This is also called This is also called burning!!! In order to burn burning!!! In order to burn something you need the 3 something you need the 3 things in the “fire things in the “fire triangle”:triangle”:

•

1) A Fuel (hydrocarbon)1) A Fuel (hydrocarbon)2) Oxygen to burn it with2) Oxygen to burn it with3) Something to ignite the 3) Something to ignite the reaction (spark)reaction (spark)


• In general: In general: CCxxHHy y + O+ O2 2 CO CO2 2 + H+ H22OO

• Products in combustion are Products in combustion are ALWAYS carbon dioxide and ALWAYS carbon dioxide and water. (although incomplete water. (although incomplete burning does cause some burning does cause some by-products like carbon by-products like carbon monoxide)monoxide)

• Combustion is used to heat Combustion is used to heat homes and run automobiles homes and run automobiles (octane, as in gasoline, is (octane, as in gasoline, is CC88HH1818) )


• In general: In general: CCxxHHy y + O+ O2 2 CO CO2 2 + H+ H22OO

• They are always exothermicThey are always exothermic• (they give off heat)(they give off heat)

What Do You Get When You Cross a What Do You Get When You Cross a Snowman With a Vampire?Snowman With a Vampire?

FrostbiteFrostbite..


Edgar Allen Poe’s drooping eyes and

mouth are potential signs of CO poisoning.

Combustion of MethaneCombustion of Methane

CHCH44 + O + O22

COCO2 2 + H+ H22OO1 2

2

Combustion of Pentane:Combustion of Pentane:

Predict the products and balance the Predict the products and balance the reaction:reaction:

CC55HH1212 + O + O22

COCO2 2 + H+ H22OO5 6

8

Predict the products and balance the Predict the products and balance the reaction:reaction:

CC33HH77OH + OOH + O22

COCO2 2 + H+ H22OO

Combustion of PropanolCombustion of Propanol

2

6 8

9

This Does Seem a Little Weird!!???

Combustion:Combustion:Let’s see if you can:Let’s see if you can:

1.1. Identify a basic combustion reactionIdentify a basic combustion reaction2.2. Predict the products of combustion Predict the products of combustion

reactionsreactions3.3. Balance this reaction typeBalance this reaction type

PracticePractice

Predict the products and balance the Predict the products and balance the reaction of hexene burning in air:reaction of hexene burning in air:

CC66HH1212 + O + O2 2

CC66HH1212 + O + O22 CO CO2 2 + H+ H22OO6 69

CombustionCombustion

• ExampleExample• CC55HH1212 + O + O22 CO CO2 2 + H+ H22OO

• Write the products and balance the following combustion Write the products and balance the following combustion reaction:reaction:• CC1010HH22 22 + O+ O22 • CO2 + H2O

5 68

2031 2

2

2

15 Helpful Hints On The Lab 15 Helpful Hints On The Lab Report from Report from

Mr. T’s Vast Lab Experience!!!Mr. T’s Vast Lab Experience!!!

Hint #8. Do not believe in miracles –

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Mixed PracticeMixed Practice

• State the type, predict the products, State the type, predict the products, and balance the following reactions:and balance the following reactions:

1.1. BaClBaCl2 2 + H+ H22SOSO44

2.2. CC66HH1212 + O + O2 2

3.3. Zn + CuSOZn + CuSO4 4

4.4. Cs + BrCs + Br2 2

5.5. FeCOFeCO33

Double Displacement

Combustion

Single Displacement

Synthesis

Decomposition

I don’t feel so I don’t feel so stupid now…stupid now…

Types of Chemical Reactions. Reactants: Zn + I 2 Product: Zn I 2.

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Transcript of Types of Chemical Reactions. Reactants: Zn + I 2 Product: Zn I 2.