Question

1. methane, ch₄, is natural gas containing both carbon and hydrogen. what type of reaction occurs when methane reacts with oxygen gas to produce carbon dioxide, water, and energy?

options:

• combustion
• synthesis
• single replacement
• double replacement

Explanation:

Combustion reactions involve a substance reacting with oxygen to produce oxides (like carbon dioxide from carbon, water from hydrogen) and energy (heat/light). Methane ($\ce{CH4}$) reacting with $\ce{O2}$ to form $\ce{CO2}$, $\ce{H2O}$, and energy fits this. Synthesis reactions combine substances into one (not here, as multiple products form). Single replacement involves one element replacing another (not seen here, as $\ce{CH4}$ is a compound, not an element replacing). Double replacement swaps ions (not applicable here). So the reaction is combustion.

Answer:

A. Combustion