1. Complete Activity 4.1 (Page 41). Collect some materials like straw, matchsticks, kerosene oil, paper, iron nails, stone pieces, glass etc. Under the supervision of your teacher try to burn each of these materials one by one. If combustion takes place mark the material combustible, otherwise mark it non-combustible (Table 4.1). Can you name some more substances which are combustible? You can add those to Table 4.1.
Table 4.1: Combustible and Non-combustible Substances
| Material | Combustible | Non-combustible |
| Wood | ||
| Paper | ||
| Iron nails | ||
| Kerosene oil | ||
| Stone piece | ||
| Straw | ||
| Charcoal | ||
| Matchsticks | ||
| Glass |
Answer: The above activity can be carried out as follows:
Aim: To burn the given materials one by one and identify whether they are combustible or non-combustible.
Materials Required: Straw, matchsticks, kerosene oil, paper, iron nails, stone pieces, glass.
Procedure:
(i) Under the supervision of your teacher try to burn each of the given materials one by one.
(ii) Mark the materials as combustible or non-combustible and complete Table 4.1.
Observations and Conclusions:
The completed Table 4.1 is shown below:
Table 4.1: Combustible and Non-combustible Substances
| Material | Combustible | Non-combustible |
| Wood | Yes | |
| Paper | Yes | |
| Iron nails | Yes | |
| Kerosene oil | Yes | |
| Stone piece | Yes | |
| Straw | Yes | |
| Charcoal | Yes | |
| Matchsticks | Yes | |
| Glass | Yes | |
| Cloth | Yes | |
| Cardboard | Yes | |
| Dry leaves | Yes | |
| Alcohol | Yes |
“Collect some materials like straw, matchsticks, kerosene oil, paper, iron nails, stone pieces, glass etc. Under the supervision of your teacher try to burn each of these materials one by one. If combustion takes place mark the material combustible, otherwise mark it non-combustible (Table 4.1). Can you name some more substances which are combustible? You can add those to Table 4.1.” – Solved.
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Extended Learning Problem 4
Solution to Extended Learning Problem 5
Solution to Activity 4.2
Solution to Activity 4.3
Solution to Activity 4.4
Solution to Activity 4.5
