Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Covalent bonds are responsible for many of the properties of covalent compounds. Covalent compounds have relatively low boiling points, cannot conduct electricity, and may not dissolve in water. Answer: covalent bonds
Output:
What is responsible for many properties of covalent compounds, which have relatively low boiling points, cannot conduct electricity, and may not dissolve in water?