CHEMICAL REACTION
CHEMICAL EQUATION
CHEMICAL FORMULA
BALANCING
TYPES OF CHEMICAL REACTION
COLLISION THEORY
FACTORS AFFECTING THE RATE OF CHEMICAL REACTION
3. Chemical ReactionChemical Reaction
It is a process in which the physical
and chemical properties of the original
substances change as new substances
with different physical and chemical
properties are formed.
Two kinds of substances:
1. The substances present before the
change.
2. The substances formed by the change.
7. 1. Taking and giving off energy1. Taking and giving off energy
• ENDOTHERMIC
– Reactions where energy is absorbed.
– Ex. Cooking of food and Photosynthesis
• EXOTHERMIC
– Reactions that involve the release of
energy.
– Ex. Explosion of firecrackers and burning
of coal
8. 1. Taking and giving off energy1. Taking and giving off energy
9. 2. Color/odor Change2. Color/odor Change
• Ex. Ripening of fruits
3. Evolution of Gas
• The release of gases
• Ex. When you dissolve a tablet of
alkaseltzer in water, bubbles are
produced.
11. 4. Formation of Precipitation4. Formation of Precipitation
• PRECIPITATE is an insoluble solid that
is formed when two liquids react.
• Ex. Combination of vinegar and milk
30. A. COMBINATION/ Synthesis
REACTION
• A reaction when 2 or more reactants
combine to form a single product.
• The general formula for this reaction
is : A + B AB
Example:
N2 +2O2 2 NO2
31. B. DECOMPOSITION
REACTION
• In this reaction, a single reactant
breaks down into simpler ones. (2 or
more products).
• The general formula for this reaction
is: AB A + B C
Example:
2 H2O 2H2 +O2
32. C. SINGLE DISPLACEMENT or
(Replacement) REACTION
• This is when one element replaces another
element from a compound.
• The more active element takes the place of
the less active element in a compound.
• The general formula for this reaction is:
A + BC AC + B
Example:
33. D. DOUBLE DISPLACEMENT REACTION
(Metathesis)
• This is when the positive ions (cations) and
negative ions (anions) of different
compounds switch places, forming two
entirely different compounds.
• The general formula for this reaction is:
AB + CD AD + CB
Example:
34.
35. E. COMBUSTION (Burning)
REACTION
• This is when oxygen combines with a
hydrocarbon to form a water and
carbon dioxide.
• Example of which is the burning of
butane gas.
C4 H 10 + O2 CO2 + H2O
36. F. ACID-BASE REACTION
• This is a special kind of double
displacement reaction that takes
place when an acid and base react
with each other.
• The H+ of the acid reacts with the
OH- of the base forming water. The
other product is salt.
Example of which is:
HCI + NaOH NaCI + H2O
37. Are a burning vehicle and a
puppy undergoing the same
kind of chemical reaction?
What reaction could this
be?
39. COLLISION THEORY
• explains how collision between
reactant molecules may or may not
result in a successful chemical
reaction.
• Effective collisions between
molecules, which result in the
formation of products, only occur
when the following two conditions
are met:
a. the colliding molecules should possess a
minimum kinetic energy, known as activation
40. Svante Arrhenius (1888)
• suggested that particles must possess a
certain minimum amount of kinetic energy
in order to react. The energy diagram is
shown below.
41. ACTIVATION ENERGY
• It is needed to break the bond between
reactant molecules to form new bonds
leading to formation of the products.
• Minimum kinetic energy required for
reaction.
43. B. PARTICLE SIZE OR
SURFACE AREA
• Smaller particles size have bigger
surface area.
• Bigger surface area means bigger
exposed portions of a solid which
are available points of contact
between reactants.
44. C. CATALYST
• A catalyst provides an energy
pathway needed to start a
reaction, therefore increasing
the reaction rate.
• The presence of catalyst
speeds up the rate of reaction.
45. D. CONCENTRATION
It is a measure of the
number of particles in a given
volume.
The higher the concentration,
the faster the rate of reaction.
47. GROUP ACTIVITY:
1. Using any form of media, prepare a visual presentation of a
chemical reaction involved in:
•Group 1: a. Food Processing and preservation
b. Fire control
•Group 2: a. Corrosion Control
b. Photochemical Smog
•Group 3: a. Haber process
b. Catalytic Converter
•Group 4: a. Formation of ozone layer in the stratosphere
b. Formation of acid rain
2. Research on how a specific chemical reaction poses useful
or harmful effects to life and the environment
3. Present and discuss to class your visual presentation