When gasoline burns in an automobile engine, which energy transformation primarily occurs?

• A. Electrical energy is converted to chemical energy.
• B. Mechanical energy is converted to electrical energy.
• C. Chemical energy is converted to mechanical energy.
• D. Thermal energy is converted to chemical energy.

Answer: (C)

Verified step by step guidance

1. Identify the initial form of energy present in gasoline before combustion, which is chemical energy stored in the fuel's molecular bonds.
2. Recognize that when gasoline burns (combusts) in the engine, a chemical reaction occurs that releases energy by breaking and forming chemical bonds.
3. Understand that the released energy from combustion is primarily converted into thermal energy (heat), which then causes expansion of gases inside the engine cylinders.
4. Note that the expanding gases exert force on the engine's pistons, converting the thermal energy into mechanical energy that moves the pistons and ultimately powers the vehicle.
5. Conclude that the primary energy transformation in this process is the conversion of chemical energy in gasoline into mechanical energy that drives the automobile.