How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]
How is a spontaneous combustion different from a rapid combustion. Explain the difference in detail. [5 MARKS]
Definitions : 1.5 Marks each
Difference : 2 Marks
Spontaneous combustion
The combustion reaction which occurs on its own(without the help of any external heat)is
called Spontaneous combustion. It was placed at room temperature. The heat required for
spontaneous combustion is produced inside the substance by its slow oxidation.
Spontaneous combustion takes place at room temperature. The heat required for spontaneous combustion is produced inside the substance by its slow oxidation. It is usually undergone by those substances which have a quite low ignition temperature.
For Ex:
1)The burning of White phosphorus on its own at room temperature is an example of
spontaneous combustion.
2)The spontaneous combustion of coal dust has resulted in many disastrous fires in coal
mines.
3) Forest fire can also be started by spontaneous combustion reaction due to the heat of the
sun or due to spark of lightning from the sky.
Rapid combustion
The combustion reaction in which a large amount of heat and light are produced in a short
time is called rapid combustion.
For Ex:
1)The immediate burning of cooking gas in a gas stove to give heat and light.
2)The burning of kerosene oil in a kerosene stove.
3)Burning of wax in a candle
The main difference between rapid and spontaneous combustion is that, in rapid combustion, one of the three elements is supplied from our side which is the heat required for ignition temperature in most cases. In spontaneous combustion, the fuel is already at or over the ignition temperature and burns instantly it comes in contact with Oxygen.
Definitions : 1.5 Marks each
Difference : 2 Marks
Spontaneous combustion
The combustion reaction which occurs on its own(without the help of any external heat)is
called Spontaneous combustion. It was placed at room temperature. The heat required for
spontaneous combustion is produced inside the substance by its slow oxidation.
Spontaneous combustion takes place at room temperature. The heat required for spontaneous combustion is produced inside the substance by its slow oxidation. It is usually undergone by those substances which have a quite low ignition temperature.
For Ex:
1)The burning of White phosphorus on its own at room temperature is an example of
spontaneous combustion.
2)The spontaneous combustion of coal dust has resulted in many disastrous fires in coal
mines.
3) Forest fire can also be started by spontaneous combustion reaction due to the heat of the
sun or due to spark of lightning from the sky.
Rapid combustion
The combustion reaction in which a large amount of heat and light are produced in a short
time is called rapid combustion.
For Ex:
1)The immediate burning of cooking gas in a gas stove to give heat and light.
2)The burning of kerosene oil in a kerosene stove.
3)Burning of wax in a candle
The main difference between rapid and spontaneous combustion is that, in rapid combustion, one of the three elements is supplied from our side which is the heat required for ignition temperature in most cases. In spontaneous combustion, the fuel is already at or over the ignition temperature and burns instantly it comes in contact with Oxygen.
