The energy released when a piece of wood is
burned has been stored in the wood as
A. sunlight.
B. heat.
C. calories.
D. chemical potential energy.

Heat and Light.

Explanation: When the wood is burned, it combines with oxygen in air to partake in a combustion reaction which is exothermic. It coverts the chemical energy in the wood and release them as light and heat. Stored potential energy (in the form of chemical energy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in the form of heat.

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