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Activity to Distinguish Combustible and Non Combustible Substances :

Instruction 1:

Ask the students to collect around ten substances namely wood, plastic, cloth, coal, Aluminium foil, Tin can, Rubber sheet, Dry leaves, Kerosene oil, cow dung cake.

Instruction 2:
Ask them to take a sheet of paper and draw tabular column as follows.


Materials Combustible substances Non combustible substances
Aluminium Foil    
Tin can    
Rubber sheet    
Dry leaves    
Kerosene oil    
Cow dung cake    

Instruction 3:
Ask the students to burn the materials one by one and observe carefully the following changes

(1) Readily catches fire on burning producing less smoke.

(2) Catches fire on prolonged burning producing a lot of smoke.

Based on the observations classify the substance as combustible and non combustible material and record it in the tabular column.

Activity to Understand Air Supports Combustion






Take three wooden planks of the size 10cm * 12cm length by width and label them as A, B, and C. Take three lighted candles and place them on the three planks, and cover the candles with glass chimney. In arrangement “A” take care to place the glass chimney covering the candle on two small wooden rods separated by a

Distance of 5cm in such a manner that there is free flow of air from below and in the arrangement “C” cover the glass chimney at the top by a wooden plank so that there is no free supply of air.



Observe the changes in the tabular column shown below.

Arrangement “A” Candle continues to burn There is free supply of air
Arrangement “B” Candle flickers and burns with smoke There is limited supply of air
Arrangement “C” Candle puts off There is no supply of air.

From the above activity it is inferred that there should be free supply of air for combustion to occur.

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