Based on oxidation number consideration, explain why carbon monoxide is a flammable but carbon dioxide is not

Carbon in carbon monoxide has oxidation number +2 and can be oxidized to oxidation number +4 (carbon(IV) oxide) in reaction with oxygen:
2CO + O₂ → 2CO₂.
Carbon has maximal oxidation number in carbon(IV) oxide and cannot be more oxidized (increase of oxidation number), carbon with oxydation number +4 cannot lose electrons to molecule of oxygen.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.