Simple molecular and giant covalent structures Quiz
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5 questions, one answer each
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1. Why does iodine have a low melting point?
- A. Its covalent bonds are weak
- B. Weak forces between its molecules are easily overcome
- C. It has delocalised electrons
- D. It has ionic bonds
2. How many covalent bonds does each carbon atom form in diamond?
- A. 2
- B. 3
- C. 1
- D. 4
3. Why does graphite conduct electricity?
- A. It contains ions
- B. It has delocalised electrons
- C. It has weak forces between molecules
- D. It is very hard
4. Which substance has a giant covalent structure?
- A. Silicon dioxide
- B. Carbon dioxide
- C. Iodine
- D. Methane
5. Why is graphite used as a lubricant?
- A. It conducts electricity
- B. It has a high melting point
- C. Its layers slide because the forces between layers are weak
- D. It is very hard