Question

what type of compound is composed of covalently bonded atoms and has a high melting point?
a. complex molecular compound
b. simple molecular compound
c. complex solid compound
d. simple solid compound

Explanation:

• Complex molecular compounds: Have covalent bonds. In complex molecular compounds (like some network covalent compounds such as diamond - made of covalently bonded carbon atoms), there is a continuous network of covalent bonds. Breaking these extensive covalent bonds throughout the network requires a large amount of energy, resulting in a high melting point.
• Simple molecular compounds: Have covalent bonds within the molecule (e.g., \(H_2O\), \(CO_2\)). But the forces between the molecules (inter - molecular forces like van der Waals forces or hydrogen bonds) are weak. So, they have low melting points.
• Complex/simple solid compounds: The term “solid compound” is too vague. Compounds are solids based on their state at a certain temperature, and it doesn't specifically describe the bonding and melting - point relationship as accurately as “complex molecular compound”.

Answer:

A. complex molecular compound