which of the following represents a covalent molecule?
select all that apply
a h₂o
b bacl₂
c cl₂
d nacl
e o₂

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Accepted Answer

# Brief Explanations:
- **For $H_2O$**:
  - Hydrogen ($H$) and oxygen ($O$) are non - metals. Non - metals form covalent bonds by sharing electrons. In $H_2O$, hydrogen and oxygen share electrons to form covalent bonds.
- **For $BaCl_2$**:
  - Barium ($Ba$) is a metal and chlorine ($Cl$) is a non - metal. Metals and non - metals form ionic bonds (transfer of electrons from metal to non - metal). So $BaCl_2$ is an ionic compound, not a covalent molecule.
- **For $Cl_2$**:
  - Chlorine ($Cl$) is a non - metal. Two chlorine atoms share electrons with each other to form a covalent bond ($Cl - Cl$), so $Cl_2$ is a covalent molecule.
- **For $NaCl$**:
  - Sodium ($Na$) is a metal and chlorine ($Cl$) is a non - metal. They form an ionic bond (sodium donates an electron to chlorine), so $NaCl$ is an ionic compound, not a covalent molecule.
- **For $O_2$**:
  - Oxygen ($O$) is a non - metal. Two oxygen atoms share electrons ($O = O$) to form a covalent bond, so $O_2$ is a covalent molecule.

# Answer:
A. $H_2O$, C. $Cl_2$, E. $O_2$

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