ScienceCâu 68 / 120
What is the chemical formula for water?
a.CO2
b.NaCl
c.O2
d.H2O
Giải thích
Water is made of two hydrogen atoms and one oxygen atom, giving the formula H2O. CO2 is carbon dioxide and NaCl is table salt. Chemical formulas show the types and numbers of atoms in a molecule.
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