Properties of Simple Molecules Quiz
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5 questions, one answer each
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1. What type of bond holds atoms together within a simple molecule?
- A. Ionic bond
- B. Metallic bond
- C. Covalent bond
- D. Hydrogen bond only
2. Why do simple molecular substances generally have low melting points?
- A. Their covalent bonds are weak
- B. Only weak intermolecular forces need to be overcome
- C. They contain delocalised electrons
- D. They are always gases
3. Why do simple molecular substances not conduct electricity?
- A. They have no free ions or delocalised electrons and no overall charge
- B. They are always solids
- C. Their covalent bonds carry the current instead
- D. They have too few electrons
4. When water boils, what is broken?
- A. The covalent O–H bonds within water molecules
- B. The weak intermolecular forces between water molecules
- C. Both the covalent bonds and intermolecular forces equally
- D. Ionic bonds between hydrogen and oxygen
5. Substance X is a simple molecular liquid at room temperature, while substance Y (also simple molecular, similar composition but much larger molecules) is a solid. What best explains this difference?
- A. Y has stronger covalent bonds than X
- B. Y has stronger intermolecular forces than X because its molecules are larger
- C. X conducts electricity but Y does not
- D. Y contains ionic bonds while X does not