The document describes various types of chemical reactions: - Substitution reactions involve replacing an atom or group on a molecule with another atom or group. Halogenation is a substitution reaction that replaces an atom with a halogen. - Combustion reactions involve hydrocarbons reacting with oxygen to produce carbon dioxide and water, releasing a large amount of heat. - Mechanics for a classroom activity are described where students will be divided into groups to perform reaction sequences within a time limit for a prize.

3. REACTION MECHANISM
•Is a step by step
description of how a
chemical reaction
occurs.

5. 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 …..

6. EXAMPLE
H H
│ Cl – Cl │
H – C – H + Cl2 --------→ H – C – Cl + H – Cl
│ │
H H

10. 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…..

11. EXAMPLE
CH4 + 2 O2 --------→ CO2 + 2 H 2O
2 C2H6 + 7 O2 --------→ 4 CO2 + 6 H2O

15. 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.

16. O
Do a sequence
║ of reactions
to produce
“trichlorofluoromethane”
and commonly
known as FREON 11.

18. O
Do a sequence
║ of reactions
to produce
“dichlorodifluoromethane”
or commonly
known as FREON 12.

19. O
Do a combustion
║ reaction of
“octane gas”
a common reaction that take
placed In a car engine.

20. O
Do a sequence
║ of reactions
to produce
“1,1,1,2 – tetrafluoroethane”
or commonly
known as HFC 134a.

21. O
Do a combustion
║ reaction of
“nonane gas”
an alkane that usually used
in some industrial
processes.

22. O
Do a sequence
║
of reactions
to produce
“2,2 – dichloro – 1,1,1 – trifluoroethane”
or commonly
known as HCFC 123.

23. O
Do a combustion
║ reaction of
“decane gas”
an alkane that usually used
in some industrial
processes.

24. O
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.