RATE OF REACTION
CONTENT
I. What is the rate of reaction?
II. How many factor do you affect
the rate of reaction?
III. The pratical meanings of
the rate of reaction
I. What is the rate of reaction?
rusting
explosion
baking
The speed of different chemical reactions varies hugely.
Some reactions are very fast, and other very low
The speed of a reaction is called the rate of the reaction
Slow
Fast
Very fast
Reaction 1 is faster than reaction 2
How fast the reactant are being used
How fast the product are being formed
A
B
C
D
Rate of reation
=
Quantity of reactant used
Quantity of product formed
Time taken
Time taken
=
g or cm^3 or mol/l
s
Concentration (mol/l)
Concentration (mol/l)
Time (s)
Time (s)
Reactant
Product
I. What is the rate of reaction?
The rate of a reaction is
the change in the concentrations of reactant
or product in a unit of time.
+
_
II. How many factor do you affect
the rate of reaction?
Concentration
Temperature
Pressure
Surface area
Catalyst
Concentration
Lower concentration
Higher concentration
The higher concentration of a dissolved reactant, the faster the rate of the reaction
There are
more particles
in the same
amount of
space
Liquid
Pressure
GAS
Temperature
The higher temperature, the faster the rate of the reaction
Particles are
more energy,
they move faster
and are
more likely to
collide with
other particle
Lower temperature
Higher temperature
Surface area
Low surface area
High surface area
Solid
There is an increased area
for the reactant particles
to collide with ,
therefore the rate of reaction increases
Catalyst
Catalysts are substance that change the rate of the reaction without being used up in the reaction
Catalyst
III. The pratical meanings of
the rate of reaction
fermentation
Combustion
freezing
cooking