Question

What sort of reaction occurs when methane and oxygen gas react?

Answer 1

Hint: At a given temperature and chemical concentration, chemical reactions occur at a predictable pace. Reaction speeds often increase as temperature rises because more thermal energy is available to attain the activation energy required to break bonds between atoms.

Complete answer:
Combustion, often known as burning, is a high-temperature exothermic redox chemical process in which a reductant (fuel) reacts with an oxidant (typically atmospheric oxygen) to create oxidised, frequently gaseous products in a mixture known as smoke. Because a flame is only visible when components undergoing combustion vaporize, combustion does not always result in fire, but when it does, a flame is a distinctive indication of the process. While the activation energy must be overcome to begin combustion (for example, lighting a fire with a lighted match), the heat from a flame may supply enough energy to keep the process going.
Methane ($$C{H}_4$$) interacts with oxygen gas to generate carbon dioxide and water when burned. $$C{H}_4\left(g\right)+O_2\left(g\right)\to C{O}_2\left(g\right)+H_{2}O$$is the unbalanced equation for this reaction. A complete combustion reaction is the name for this sort of reaction.
The combustion of a hydrocarbon fuel, such as natural gas, is a particularly important family of exothermic reactions:
$C{H}_4+2O_2\to C{O}_2+2H_{2}O$
The majority of the energy released in these cases was stored in $O_2$ , which has a weak double bond. In every chemical reaction, old chemical connections are broken and new, stronger chemical bonds are formed. When atoms join together to create new, more permanent chemical bonds, the electrostatic forces that pull them together leave a huge surplus of energy in the bond. If that energy isn't released, the new link will rapidly disintegrate. Instead, the new bond can lose its surplus energy by radiation, transfer to other molecular movements, or collisions with other molecules, and then become a stable new bond. The heat that escapes the chemical system is this surplus energy.
Hence exothermic reaction is the answer

Note:
The words "endothermic" and "endotherm" are both derived from Greek "inside" and therm "heat," but they can have quite different meanings depending on context.
The word "endothermic" is used to indicate a reaction in which energy is taken "inside" a process in which thermodynamics is applied to physical characteristics of matter (vs an "exothermic" reaction which releases energy "outwards").