Question

missed this? read section 12.7. you can click on the review link to access the section in your etext.

part a

identify each of the following solids as molecular, lonic, or atomic
sort these solids into the proper categories.

co₂(s) ni(s) i₂(s) cacl₂(s)

molecular ionic atomic

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Explanation:

• Molecular solids: Composed of discrete molecules held together by weak intermolecular forces (e.g., London dispersion forces, dipole - dipole forces, or hydrogen bonds).
• $\ce{CO2(s)}$ (dry ice): Carbon dioxide is a covalent compound. In the solid state, $\ce{CO2}$ molecules are held together by London dispersion forces.
• $\ce{I2(s)}$: Iodine is a non - polar covalent molecule. In the solid state, $\ce{I2}$ molecules are held together by London dispersion forces.
• Ionic solids: Composed of cations and anions held together by strong ionic bonds.
• $\ce{CaCl2(s)}$: Calcium chloride is an ionic compound. It consists of $\ce{Ca^{2+}}$ cations and $\ce{Cl^{-}}$ anions held together by ionic bonds.
• Atomic solids: Composed of atoms held together by covalent bonds (network atomic solids like diamond) or metallic bonds (metallic atomic solids).
• $\ce{Ni(s)}$: Nickel is a metal. In the solid state, nickel atoms are held together by metallic bonds.

Answer:

• Molecular: $\ce{CO2(s)}$, $\ce{I2(s)}$
• Ionic: $\ce{CaCl2(s)}$
• Atomic: $\ce{Ni(s)}$