Some non-polar substances can be liquid at room temperature, its explanation is given by which of the following?

• A. The molecules form bonds by sharing electrons
• B. Temporary dipoles with partial charges are formed by the molecules
• C. The molecules form ions with opposite charges by transferring electrons
• D. The molecules form positive ions that are held together by free electrons
• E. The molecules form temporary bonds between hydrogen and electronegative atoms

Non-polar substances can exist as liquids at room temperature primarily due to the presence of temporary dipoles. This phenomenon occurs when the distribution of electrons around the molecules fluctuates, creating brief moments where partial charges develop. Therefore, the correct explanation is:

Correct Answer

B. Temporary dipoles with partial charges are formed by the molecules.

Why This Happens

In non-polar substances, the electrons are distributed evenly, but they can still create temporary dipoles. These fleeting dipoles lead to weak attractions between molecules, allowing them to remain in a liquid state at room temperature.

Other Options Explained

• A. This option refers to covalent bonding, which is not the primary reason for non-polar liquids.
• C. This describes ionic bonding, which is not applicable to non-polar substances.
• D. This suggests the formation of positive ions, which is not relevant here.
• E. This option relates to hydrogen bonding, typically seen in polar substances.

Understanding the behavior of non-polar substances helps in grasping the concepts of molecular interactions and states of matter.