The molecules of CO2 in dry ice form__________________?
Correct answer: C. Molecular crystal
- A. Ionic crystal
- B. Covalent crystal
- C. Molecular crystal
- D. Any type of crystal
Explanation
Dry ice is solid carbon dioxide, and its individual CO2 molecules remain intact in the solid. The molecules are held together by weak intermolecular forces, so dry ice forms a molecular crystal rather than an ionic or covalent network crystal. The likely mistake is choosing covalent crystal because CO2 contains covalent bonds, but the crystal classification depends on the forces between particles.
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About Ionic and Molecular Crystals
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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