From four substances described below, which is most likely to be an ionic compound?
Correct answer: D. Melting point 800°C, molten substance readily conducts electricity
- A. Melting point 1500°C, molten substance is a poor electrical conductor
- B. Melting point 20°C, molten substance does not conduct electricity
- C. Melting point 150°C, molten substance does not conduct electricity
- D. Melting point 800°C, molten substance readily conducts electricity
Explanation
Ionic compounds have high melting points. They are poor conductors in solid state but very good conductors of electricity in molten state.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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