ALKANEREACTION

S

REACTION

MECHANISM

REACTION MECHANISM

•Is a step by step description of how a

chemical reaction occurs.

SUBSTITUTION

REACTION

SUBSTITUTION REACTION• Is a chemical reaction in which

an atom or group on a molecule is replaced by another atom or group.

NOTE: replacement by a halogen is called HALOGENATION reaction …..

EXAMPLE

GENERAL FORMULA

Alkane + Halogen -----------→ Haloalkane + Hydrogen Halideslightheat

H │H – C – H │ HMETHANE

+Cl – Cl

Cl2 --------→heatlight

H │H – C – Cl │ H

H – Cl +

chloromethane

HYDROGEN CHLORIDE

methylchloride

INDUSTRIAL

APPLICATIONS

COMBUSTION

REACTION

COMBUSTION REACTION• Is a chemical reaction wherein

hydrocarbon reacts with oxygen and produces Carbon

Dioxide and water.NOTE: great amount of heat is released in this reaction…..

EXAMPLE

GENERAL FORMULA

Hydrocarbon (Alkane) + Oxygen -----------→ Carbon Dioxide + Water

METHANE

+ --------→ H2O +CH4 CO2 2 O2 2

C2H6

ETHANE

+ O2 --------→ CO2 67 42 + H2O

INDUSTRIAL

APPLICATIONS

Do U want to PLAY a

game?

Mechanics D’ class will be divided into 2 groups BOYS & GIRLS Each group will be represented by a leader I will be D’ one flashing D’ instructions on screen Then, U will be D’ one to execute the given

instructions. U will be given 20 seconds 2 answer. The winning group will receive a GIFT that will be revealed tomorrow.

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EXAMPLE

Do a sequence of reactions to produce

“trichlorofluoromethane” and commonly

known as FREON 11.

D’ game starts

Now………

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ITEM # 1

Do a sequence of reactions to produce

“dichlorodifluoromethane” or commonly

known as FREON 12.

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ITEM # 2

Do a combustion reaction of “octane gas”

a common reaction that take placed In a car engine.

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ITEM # 3

Do a sequence of reactions to produce

“1,1,1,2 – tetrafluoroethane” or commonly

known as HFC 134a.

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ITEM # 4

Do a combustion reaction of “nonane gas”

an alkane that usually used in some industrial

processes.

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ITEM # 5

Do a sequence of reactions to produce

“2,2 – dichloro – 1,1,1 – trifluoroethane” or commonly

known as HCFC 123.

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ITEM # 6

Do a combustion reaction of “decane gas”

an alkane that usually used in some industrial

processes.

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ITEM # 7

Do a sequence of reactions to produce

“2 – bromo – 2 – chloro – 1,1,1 – trifluoroethane” or commonly

known as HALOTHANE a liquid anaesthetic widely used today.

Dat’s all FOLKS…