Practice problem
Will any combination of H and O make water?
Yes, any combination of H and O is water.
Yes, so long as there's at least 2 hydrogen atoms and 1 oxygen atom, some water will be produced at a constant ratio of 2 H to 1 O, with some possible remaining H or O, but no other compounds.
Not necessarily, as H and O can form multiple compounds, depending on the ratios they react in.
No, H and O have to be in an exact 2:1 ratio for any water to be formed.
Type a concept, like “slope” or “photosynthesis”.