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In one molecule of water, in what ratio are the atoms joined together?
ATwo hydrogen to one oxygen
BOne hydrogen to two oxygen
CTwo hydrogen to two oxygen
DOne hydrogen to one oxygen
Answer & Solution
Correct answer: A. Two hydrogen to one oxygen
1. A water molecule is made of one oxygen atom and two hydrogen atoms.
2. That gives two hydrogen atoms for every one oxygen atom.
3. Every water molecule keeps this same fixed ratio, which is what makes water a compound.
4. Swapping the numbers around would describe a different substance altogether.
_Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Compounds_