1. The problem statement, all variables and given/known data Does combustion reactions always result in water and carbon dioxide being formed, can it just have water or just carbon dioxide, or does water and carbon dioxide not need to be products. Furthermore would Iron(II)oxide(s) + oxygen(g)--> iron(III)oxide(s) be considered a combustion or synthesis reaction. 2. Relevant equations - 3. The attempt at a solution I've looked at a few sources on the internet including wikipedia, but they all seem to contradict what my book or what my teacher says in some way. I would really appreciate if someone could clear this up for me.