4. Factors Affecting the Rate of
Reaction
Total surface area of solid
reactant
Jumlah luas permukaan bahan
Concentration of reactant
Kepekatan bahan
Temperature of reactant
Suhu bahan
Use of catalyst
Penggunaan pemangkin
Pressure of gaseous reactant
Tekanan gas bahan
5. Effect of total surface area of solid reactant
on the rate of reaction
Smaller the size (increase the total surface
area), cm3, of the solid reactant, the higher
the rate of reaction, the shorter time taken
Zinc powder - Small
size, big total
surface area
Zinc granules - Big
size, small total
surface area
6. 1 big cube (big size)
Total surface area
= 100 cm2 x 6 = 600 cm2
7. 1 big cube (big size)
Total surface area = 600 cm2
1 cm
1 cm
Total surface area for 1 small cubes
= 1 cm2 x 6 = 6 cm2
There are 1000 small cubes,
so,
Total surface area for all small
cubes;
= 6 cm2 x 1000 = 6000 cm2
8. Effect of concentration of a liquid reactant on the
rate of reaction
Higher the concentration, mol dm-3, of a
liquid reactant, the higher the rate of
reaction
9. Effect of temperature on the rate of
reaction
Increase in temperature, the higher the
rate of reaction.
Effect of pressure on the rate of reaction
Increase in pressure, the higher the
rate of reaction
10. Effect of catalyst on the rate of
reaction
Alters the rate of reaction
It is specific in its action. It can only
catalyse
a particular reaction
Does not change the quantity of
products
formed
Only small amount of catalyst is
needed to
increases the rate of reaction. (An
increase in
12. The end of the graph depends on the
Volume of Gas number of mole reactants used
Time
The slope /gradient of the graph depends on the
Factors that Affect the Rate of Reaction
13. C
B
A
The factors are:
- Size
- Temperature
- Concentration
- Pressure
- Catalyst
A - 2 g of zinc powder reacts with 50 cm3 0.5 mol dm-3
of HCl
B - 2 g of zinc powder reacts with 25 cm3 1.0 mol dm-3
of HCl
C - 2 g of zinc powder reacts with 100 cm3 0.7 mol dm-3
of HCl
14. B
C
A
The factors are:
- Size
- Temperature
- Concentration
- Pressure
- Catalyst
A - 5 g of granulated zinc reacts with 100 cm3 0.5 mol dm-3
of H2SO4
B - 5 g of granulated zinc reacts with 200 cm3 0.5 mol dm-3
of H2SO4
C - 5 g of zinc powder reacts with 200 cm3 0.5 mol dm-3
of H2SO4
15. B
C
A
The factors are:
- Size
- Temperature
- Concentration
- Pressure
- Catalyst
A - 5 g of granulated zinc reacts with 25 cm3 0.5 mol dm-3
of H2SO4 when heated until 50oC
B - 5 g of granulated zinc reacts with 100 cm3 0.5 mol dm-3
of H2SO4 when heated until 50oC
C - 5 g of granulated zinc reacts with 100 cm3 0.5 mol dm-3
of H2SO4 when heated until 70oC