Question

this is an octane molecule ( found in gasoline).
what do you notice about the molecules found in gasoline? when gasoline burns, what do you think is happening to the molecules?

Explanation:

For the molecules in gasoline (like octane), they are hydrocarbon molecules (composed mainly of carbon and hydrogen atoms, often in long chains or branched structures). When gasoline burns, it undergoes a combustion reaction. In combustion, the hydrocarbon molecules react with oxygen (from the air). The chemical bonds in the hydrocarbon molecules (C - C and C - H bonds) break, and new bonds form with oxygen to produce carbon dioxide ($\ce{CO_2}$), water ($\ce{H_2O}$), and release energy (heat and light). The molecules are broken apart and rearranged into new substances (the products of combustion) as the chemical reaction occurs.

Answer:

• Notice about gasoline molecules: Gasoline molecules (e.g., octane) are hydrocarbons, primarily composed of carbon and hydrogen atoms, often arranged in long (or branched) carbon - chain structures.
• What happens when gasoline burns: The hydrocarbon molecules in gasoline undergo combustion (a chemical reaction) where they react with oxygen. The chemical bonds within the hydrocarbon molecules break, and the atoms rearrange to form new substances (carbon dioxide, water) while releasing energy (heat, light). The original gasoline molecules are broken apart and transformed into the molecules of the combustion products.