Question

When you burn a piece of wood different changes take place. Analyse the following. 

a) Predict possible changes and list them all. 

b) Are there any physical changes among them? 

c) How many forms of energy are released in the change? 

d) What chemical changes do you notice? Explain briefly why these occur.

Answer 1

a) During burning.

1. Heat is produced 

2. Sound and light is also produced. 

3. Wood turns into ash 

4. Chemical change. 

b) No physical changes are there in the list. 

c) Heat energy, light energy, sound energy are produced. 

d) Wood turns into carbon dioxide and ash. 

(wood) carbon + (Air) Oxygen → Carbon dioxide + ash.