🔍 Key Concepts

• Combustion is a chemical reaction between a fuel and oxygen • How energy transforms from one form to another during burning • Difference between stored energy in fuel and the energy released when it burns

💭 Think About

• Ask yourself: What kind of energy is stored inside the fuel before it burns? • When fuel burns, what form of energy actually comes out first at the molecular level—before it is turned into motion or electricity? • Which option describes the type of energy involved in rearranging atoms and molecules during burning?

✅ Before You Answer

• Remember that fuel before burning contains stored energy in the bonds between atoms • Distinguish between energy released at the flame and energy that might later be converted to motion or electricity • Eliminate any options that describe results of later energy conversions rather than the energy of the combustion reaction itself