The combustion of methane in a Bunsen burner is an example of a reaction

Combustion reaction

Explanation:

Combustion reaction is a type of chemical reaction which takes place in the presence of oxygen that is it involves burning.

In this reaction, the substance which burns is known as a fuel and yields carbon dioxide, water and heat energy.

The methane gas is present as a component of natural gas and when burned over a bunsen burner reacts with oxygen and yields carbon dioxide and water.

The chemical reaction for the combustion of methane is:

 CH₄[g] + 2 O₂[g] -> CO₂[g] + 2 H₂O[g] + energy

Thus, Combustion reaction is the correct answer.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

a polar bond is formed when electrons are shared unevenly between atoms