Is turning methane and oxygen rearranged to form carbon dioxide and water. Was this reaction a physical change or a chemical change. What is your evidence?

chemical change

Explanation:

turning methane plus oxygen into carbon dioxide and water is a chemical process because the substances change into completely new substances (co2 and water), it's no longer methane and oxygen. It's not a physical change because physical changes only affect appearance.

If this was a lab, possible evidences of a chemical change can be bubbling, heat, color change (occasionally)... etc.

chem isn't my best course but I hope this helps

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.