Explain why burning of wood and cutting it into small pieces are considered as two different types of changes?

Answer 1

Because burnning wood is using energy but breaking is using forces.

When wood burns, it's not wood any more. It turns into smoke, ash, and (maybe) charcoal.

When you break wood, it's still wood.

When you change something into a different substance, that's a chemical change.

Answer 2

Burning wood creates a chemical reaction that transforms the wood into water vapor, carbon dioxide, carbon monoxide if there's not enough O2 to make all the carbon happy, plus various other compounds that depend on things like the kind of wood, where it grew, how many nails the carpenter who had it last drove into it, etc., etc., etc.

Cutting it into small pieces just makes small pieces of wood, but they're still wood. It's a physical change.

Answer 3

Burning wood is a chemical change because the chemical composition of the wood changes, and it produces new substances with different properties than the wood. Cutting wood is a physical change because the chemical composition is not changed, the wood just changes size and shape.

Answer 4

burning of wood is a chemical change as it produces heat and cutting it into small pieces is a physical change as there is a change in shape and size.