Other than water, which product results from burning most fuels? A) Carbon dioxide, B) hydroxide, C) hydrogen, D) carbon disulfide, or E) hydrocarbons.
Most fuels that we burn, such as gasoline, kerosene, or diesel, are hydrocarbons. Hydrocarbons are molecules that only contain hydrogen and carbon. When we burn these hydrocarbons, they undergo what we call a combustion reaction. In a combustion reaction, the hydrocarbons combine with oxygen from the air in the presence of heat to form water and carbon dioxide. The question wanted to know the product of this reaction other than water. So the correct answer is answer choice A, carbon dioxide.
We’ve already identified the correct answer choice. But let’s quickly go through the identity of the other answer choices just so we know what they are. Hydroxide is the OH⁻ ion. It’s what’s present in basic solutions. Hydrogen is the first element on the periodic table, which often exists as the diatomic gas H₂. Carbon disulfide has the chemical formula CS₂. It’s commonly used in industrial applications, such as the production of salophen and the material rayon. And we’ve already discussed what hydrocarbons are. They are molecules that only contain hydrogen and carbon. But carbon dioxide, answer choice A, is the product other than water that results from burning most fuels.