Question

in a typical fossil fuel electricity generating plant, fossil fuels combine with oxygen in the air to create thermal energy. what energy is converted into this thermal energy?
a the chemical energy stored in the bonds only the fossil fuel molecules.
b the electrical energy of the fossil fuel and oxygen.
c the kinetic energy of the turning turbine.
d the chemical energy stored in the bonds of the fossil fuel and oxygen molecules.

Explanation:

To solve this, we analyze each option:

• Option a: Fossil fuel combustion involves reaction with oxygen, so energy from oxygen's bonds also contributes, so a is wrong.
• Option b: Fossil fuels and oxygen don't have electrical energy in this context; combustion is a chemical reaction, so b is wrong.
• Option c: The turbine's kinetic energy is produced after thermal energy is converted, not the source of thermal energy, so c is wrong.
• Option d: In combustion, chemical energy from bonds of both fossil fuel and oxygen molecules is converted to thermal energy (as bonds break and form, releasing energy). This matches the process.

Answer:

d. The chemical energy stored in the bonds of the fossil fuel and oxygen molecules.