Question

Pieces of wood burn faster than a log of wood of the same mass because

• A. Surface area of log of wood is larger and needs more time to burn
• B. Pieces of wood have large surface area
• C. All piece of wood catch fire at the same time
• D. Block of wood has higher density than pieces of the same wood

Answer 1

The correct option is A Surface area of log of wood is larger and needs more time to burn

The combustion of wood is based on pyrolysis. It is the nature of combustion reaction as the log of wood catches fire slowly is due to having a higher surface area for wood to catch fire. Also, combustion requires oxygen for the reaction to take place and perhaps the voids in the wood pieces provide better oxygen circulation to fuel the combustion reaction. That is why wood pieces catch fire relatively easier and burn faster than a wooden log.

So, the correct answer is 'Surface area of log of wood is larger and needs more time to burn'