Gas Fitter Practice Test

What is the combustion process of natural gas primarily producing?

1. Water vapor and sulfur

2. Carbon dioxide and water

3. Carbon monoxide and hydrogen

4. Halogens and acids

The correct answer is: Carbon dioxide and water

The combustion process of natural gas primarily produces carbon dioxide and water. When natural gas, mainly composed of methane (CH₄), undergoes complete combustion in the presence of sufficient oxygen, the chemical reaction results in the formation of carbon dioxide (CO₂) as a primary gaseous product and water (H₂O) in vapor form. This reaction can be simplified to the chemical equation: CH₄ + 2 O₂ → CO₂ + 2 H₂O. This process is significant because it highlights the importance of complete combustion for minimizing harmful emissions. While other byproducts can form under incomplete combustion conditions, such as carbon monoxide or unburned hydrocarbons, the ideal scenario aims for complete combustion to ensure maximum energy efficiency and reduced pollutant output. The presence of sulfur compounds, halogens, or acids does not relate to the combustion process of natural gas, reinforcing that carbon dioxide and water are indeed the correct products of this reaction.