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

Hey mate
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Ans:- b)No,there are no physical change among them.
--------c) release of energy- heat

Answer 2

Burning wood leads to a chemical change.  

Explanation:

(a) When a piece of wood starts burning, the possible changes are that it turns black in color and creates ash and emits smoke in the form of carbon dioxide. Eventually, the piece of wood ceases to exist and turns wholly to ash.

(b) Yes, physical change takes place as the wood turns to ash.  

(c) Thermal and kinetic energy is released in the change

(d) The chemical reaction is that the carbon in the wood burns in the presence of oxygen and gives rise to carbon dioxide.

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