Covalent Bonding and Simple Molecular Substances Quiz
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5 questions, one answer each
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1. What is covalent bonding?
- A. Transfer of electrons between ions
- B. Sharing of pairs of electrons between atoms
- C. Delocalised electrons shared through a structure
- D. Attraction between oppositely charged ions
2. Why do simple molecular substances have low boiling points?
- A. Their covalent bonds are weak
- B. Only weak intermolecular forces need to be overcome
- C. They contain free-moving ions
- D. They have no bonds at all
3. Which of these correctly explains why larger molecules generally have higher boiling points than smaller ones?
- A. Larger molecules have more covalent bonds inside them that must be broken to boil
- B. Larger molecules have stronger intermolecular forces to overcome
- C. Larger molecules are always ionic
- D. Larger molecules conduct electricity, unlike smaller ones
4. A student tests a substance and finds it has a low melting point and does not conduct electricity in any state. What type of substance is this most likely to be?
- A. A giant ionic compound
- B. A simple molecular substance
- C. A metal
- D. A giant covalent structure
5. Water (H2O) boils at 100°C while a much larger molecule made of the same elements might boil at a far higher temperature. Which statement best explains this using bonding ideas?
- A. Water has weaker covalent O–H bonds than the larger molecule
- B. The larger molecule has stronger intermolecular forces than water because of its greater size, even though both have strong covalent bonds internally
- C. Water conducts electricity but the larger molecule does not
- D. The larger molecule is ionic while water is covalent