So..... I believe this is a Convergent boundary and mountains..
The methane molecule undergoes oxidation and the carbon is oxidized to carbon dioxide and hydrogen to water.
In this reaction there is cleavage of four C-H bonds and two O=O bonds
there will be formation of two C=O bonds and four O-H bonds.
Overall due to more bond cleavage energy there will be evolution of energy. thus combustion is an exothermic reaction.
Answer:
vigorous
Explanation:
As you go down group one of the periodic table, the reactions become and more vigorous.
Chemical change because it cannot be reversed